diff --git a/docs/图表.md b/docs/图表.md
new file mode 100644
index 0000000..1de026e
--- /dev/null
+++ b/docs/图表.md
@@ -0,0 +1,41 @@
+📊 可以添加的图表类型
+1. 提交效率趋势图 (折线图)
+数据来源: durationData 中的 submission_count / problem_count
+展示内容: 每个时间段的提交效率（提交次数/完成题目数），值越接近1说明一次AC率越高
+价值: 反映刷题质量的提升
+2. 排名分布图 (直方图/箱线图)
+数据来源: solved 数组中每道题的 rank 和 ac_count
+展示内容: 用户解题排名的分布情况（如：前10%、10-30%、30-50%等区间的题目数量）
+价值: 了解解题速度和竞争力
+3. 等级分布饼图/环形图
+数据来源: solved 数组中每道题的 grade
+展示内容: S/A/B/C 各等级题目的数量和占比
+价值: 直观看出题目质量分布
+4. 标签雷达图
+数据来源: tags 对象
+展示内容: 多维度展示各类标签的掌握程度（可以归一化处理）
+价值: 可视化知识点覆盖面
+5. 时间活跃度分析 (热力矩阵)
+数据来源: solved 数组中的 ac_time
+展示内容: 按星期几和时间段统计做题分布（如：工作日vs周末，早中晚时段）
+价值: 了解学习习惯和时间规律
+6. 难度-等级关联散点图
+数据来源: solved 数组中的难度信息和 grade
+展示内容: X轴为难度，Y轴为等级，每个点代表一道题
+价值: 分析在不同难度下的表现
+7. 做题加速度图
+数据来源: durationData
+展示内容: 每个时间段完成题目数的变化率
+价值: 看出学习动力的变化趋势
+8. 竞赛题目占比
+数据来源: solved 数组中的 contest_id 和 contest_count
+展示内容: 竞赛题 vs 常规题的数量对比
+价值: 了解竞赛参与情况
+9. 连续做题天数统计
+数据来源: heatmapData
+展示内容: 最长连续做题天数、当前连续天数等
+价值: 激励持续学习
+10. 月度对比雷达图
+数据来源: durationData
+展示内容: 多个维度（完成题目数、提交次数、等级、效率等）的月度对比
+价值: 全面评估进步情况
\ No newline at end of file
diff --git a/src/oj/ai/analysis.vue b/src/oj/ai/analysis.vue
index e20348d..3b4ebeb 100644
--- a/src/oj/ai/analysis.vue
+++ b/src/oj/ai/analysis.vue
@@ -12,15 +12,18 @@
             />
           </n-flex>
           <Overview />
-          <n-grid :cols="2" :x-gap="20">
-            <n-gi :span="1">
-              <TagsChart />
+          <n-grid :cols="2" :x-gap="20" :y-gap="20">
+            <n-gi :span="isDesktop ? 1 : 2">
+              <DifficultyGradeChart />
             </n-gi>
-            <n-gi :span="1">
-              <n-flex vertical :size="20">
-                <DifficultyChart />
-                <GradeChart />
-              </n-flex>
+            <n-gi :span="isDesktop ? 1 : 2">
+              <TagsRadarChart />
+            </n-gi>
+            <n-gi :span="isDesktop ? 1 : 2">
+              <RankDistributionChart />
+            </n-gi>
+            <n-gi :span="isDesktop ? 1 : 2">
+              <TimeActivityHeatmap />
             </n-gi>
           </n-grid>
           <SolvedTable />
@@ -30,6 +33,7 @@
         <n-flex vertical size="large">
           <Heatmap />
           <ProgressChart />
+          <EfficiencyChart />
           <DurationChart />
           <AI v-if="aiStore.detailsData.solved.length >= 10" />
         </n-flex>
@@ -48,13 +52,15 @@
 <script setup lang="ts">
 import { isDesktop } from "shared/composables/breakpoints"
 import { formatISO, sub, type Duration } from "date-fns"
-import TagsChart from "./components/TagsChart.vue"
-import DifficultyChart from "./components/DifficultyChart.vue"
-import GradeChart from "./components/GradeChart.vue"
+import TagsRadarChart from "./components/TagsRadarChart.vue"
+import DifficultyGradeChart from "./components/DifficultyGradeChart.vue"
+import TimeActivityHeatmap from "./components/TimeActivityHeatmap.vue"
+import RankDistributionChart from "./components/RankDistributionChart.vue"
 import Overview from "./components/Overview.vue"
 import Heatmap from "./components/Heatmap.vue"
 import ProgressChart from "./components/ProgressChart.vue"
 import DurationChart from "./components/DurationChart.vue"
+import EfficiencyChart from "./components/EfficiencyChart.vue"
 import AI from "./components/AI.vue"
 import SolvedTable from "./components/SolvedTable.vue"
 import { useAIStore } from "../store/ai"
diff --git a/src/oj/ai/components/DifficultyChart.vue b/src/oj/ai/components/DifficultyChart.vue
deleted file mode 100644
index 7a5dfea..0000000
--- a/src/oj/ai/components/DifficultyChart.vue
+++ /dev/null
@@ -1,72 +0,0 @@
-<template>
-  <n-card title="难度统计" size="small" v-if="show">
-    <Bar :data="data" :options="options" />
-  </n-card>
-</template>
-<script setup lang="ts">
-import { Bar } from "vue-chartjs"
-import {
-  Chart as ChartJS,
-  CategoryScale,
-  LinearScale,
-  BarElement,
-  Title,
-  Tooltip,
-  Legend,
-  Colors,
-} from "chart.js"
-import { useAIStore } from "oj/store/ai"
-
-// 仅注册柱状图所需的 Chart.js 组件
-ChartJS.register(
-  CategoryScale,
-  LinearScale,
-  BarElement,
-  Title,
-  Tooltip,
-  Legend,
-  Colors,
-)
-
-const aiStore = useAIStore()
-
-const show = computed(() => {
-  return (
-    Object.values(aiStore.detailsData.difficulty).reduce((a, b) => a + b, 0) > 0
-  )
-})
-
-const data = computed(() => {
-  return {
-    labels: Object.keys(aiStore.detailsData.difficulty),
-    datasets: [
-      {
-        data: Object.values(aiStore.detailsData.difficulty),
-        backgroundColor: ["#FF6384", "#36A2EB", "#FFCE56"],
-      },
-    ],
-  }
-})
-
-const options = {
-  interaction: {
-    intersect: false,
-  },
-  maintainAspectRatio: false,
-  scales: {
-    y: {
-      ticks: {
-        stepSize: 1,
-      },
-    },
-  },
-  plugins: {
-    legend: {
-      display: false,
-    },
-    title: {
-      display: false,
-    },
-  },
-}
-</script>
diff --git a/src/oj/ai/components/DifficultyGradeChart.vue b/src/oj/ai/components/DifficultyGradeChart.vue
new file mode 100644
index 0000000..51b9170
--- /dev/null
+++ b/src/oj/ai/components/DifficultyGradeChart.vue
@@ -0,0 +1,145 @@
+<template>
+  <n-card title="难度掌握情况" size="small" v-if="show">
+    <template #header-extra>
+      <n-text depth="3" style="font-size: 12px">
+        了解不同难度题目的完成等级分布
+      </n-text>
+    </template>
+    <div style="height: 300px">
+      <Bar :data="data" :options="options" />
+    </div>
+  </n-card>
+</template>
+
+<script setup lang="ts">
+import { Bar } from "vue-chartjs"
+import {
+  Chart as ChartJS,
+  CategoryScale,
+  LinearScale,
+  BarElement,
+  Title,
+  Tooltip,
+  Legend,
+} from "chart.js"
+import { useAIStore } from "oj/store/ai"
+import type { Grade } from "utils/types"
+
+ChartJS.register(CategoryScale, LinearScale, BarElement, Title, Tooltip, Legend)
+
+const aiStore = useAIStore()
+
+// 难度和等级的顺序（后端返回的是中文）
+const difficultyOrder = ["简单", "中等", "困难"]
+const gradeOrder: Grade[] = ["S", "A", "B", "C"]
+
+// 统计每个难度-等级组合的题目数量
+const matrix = computed(() => {
+  const result: { [difficulty: string]: { [grade: string]: number } } = {}
+
+  // 初始化矩阵
+  difficultyOrder.forEach((diff) => {
+    result[diff] = {}
+    gradeOrder.forEach((grade) => {
+      result[diff][grade] = 0
+    })
+  })
+
+  // 统计数据
+  aiStore.detailsData.solved.forEach((item) => {
+    const diff = item.difficulty
+    const grade = item.grade
+    if (diff && grade && result[diff]) {
+      result[diff][grade]++
+    }
+  })
+
+  return result
+})
+
+const show = computed(() => {
+  return aiStore.detailsData.solved.length > 0
+})
+
+// 为每个等级准备数据集
+const data = computed(() => {
+  // 为每个等级生成一个 dataset
+  const datasets = gradeOrder.map((grade) => {
+    return {
+      label: `等级 ${grade}`,
+      data: difficultyOrder.map((diff) => matrix.value[diff][grade]),
+      backgroundColor: getGradeColor(grade),
+      borderColor: getGradeColor(grade),
+      borderWidth: 1,
+    }
+  })
+
+  return {
+    labels: difficultyOrder,
+    datasets,
+  }
+})
+
+// 根据等级返回对应的颜色
+function getGradeColor(grade: Grade): string {
+  const colors: { [key in Grade]: string } = {
+    S: "#FF6384",
+    A: "#FFCE56",
+    B: "#36A2EB",
+    C: "#95F204",
+  }
+  return colors[grade]
+}
+
+const options = {
+  responsive: true,
+  maintainAspectRatio: false,
+  interaction: {
+    intersect: false,
+    mode: "index" as const,
+  },
+  scales: {
+    x: {
+      stacked: true,
+      grid: {
+        display: false,
+      },
+    },
+    y: {
+      stacked: true,
+      ticks: {
+        stepSize: 1,
+      },
+      title: {
+        display: true,
+        text: "题目数量",
+      },
+    },
+  },
+  plugins: {
+    legend: {
+      display: true,
+      position: "bottom" as const,
+      labels: {
+        boxWidth: 12,
+        padding: 8,
+        font: {
+          size: 11,
+        },
+      },
+    },
+    title: {
+      display: false,
+    },
+    tooltip: {
+      callbacks: {
+        footer: (items: any[]) => {
+          const total = items.reduce((sum, item) => sum + item.parsed.y, 0)
+          return `该难度总计: ${total} 题`
+        },
+      },
+    },
+  },
+}
+</script>
+
diff --git a/src/oj/ai/components/DurationChart.vue b/src/oj/ai/components/DurationChart.vue
index b73334d..e1912d4 100644
--- a/src/oj/ai/components/DurationChart.vue
+++ b/src/oj/ai/components/DurationChart.vue
@@ -1,5 +1,10 @@
 <template>
   <n-card :title="title" size="small">
+    <template #header-extra>
+      <n-text depth="3" style="font-size: 12px">
+        全面评估学习情况
+      </n-text>
+    </template>
     <div class="chart">
       <Chart type="bar" :data="data" :options="options" />
     </div>
@@ -69,15 +74,17 @@ const data = computed<ChartData<"bar" | "line">>(() => {
     datasets: [
       {
         type: "bar",
-        label: "完成题目数量",
+        label: "完成题目数",
         data: aiStore.durationData.map((duration) => duration.problem_count),
         yAxisID: "y",
+        order: 2,
       },
       {
         type: "bar",
         label: "总提交次数",
         data: aiStore.durationData.map((duration) => duration.submission_count),
         yAxisID: "y",
+        order: 2,
       },
       {
         type: "line",
@@ -88,6 +95,10 @@ const data = computed<ChartData<"bar" | "line">>(() => {
         tension: 0.4,
         yAxisID: "y1",
         barThickness: 10,
+        order: 1,
+        borderWidth: 2,
+        pointRadius: 4,
+        pointHoverRadius: 6,
       },
     ],
   }
@@ -100,16 +111,26 @@ const options = computed<ChartOptions<"bar" | "line">>(() => {
     },
     maintainAspectRatio: false,
     scales: {
+      x: {
+        grid: {
+          display: false,
+        },
+      },
       y: {
         ticks: {
           stepSize: 1,
         },
+        title: {
+          display: true,
+          text: "数量",
+        },
+        beginAtZero: true,
       },
       y1: {
         type: "linear",
         position: "right",
-        min: -1,
-        max: gradeOrder.length,
+        min: -0.5,
+        max: gradeOrder.length - 0.5,
         ticks: {
           stepSize: 1,
           callback: (v) => {
@@ -117,9 +138,27 @@ const options = computed<ChartOptions<"bar" | "line">>(() => {
             return gradeOrder[idx] || ""
           },
         },
+        title: {
+          display: true,
+          text: "等级",
+        },
+        grid: {
+          display: false,
+        },
       },
     },
     plugins: {
+      legend: {
+        display: true,
+        position: "bottom" as const,
+        labels: {
+          boxWidth: 12,
+          padding: 8,
+          font: {
+            size: 11,
+          },
+        },
+      },
       title: {
         display: false,
       },
@@ -133,6 +172,16 @@ const options = computed<ChartOptions<"bar" | "line">>(() => {
             }
             return `${dsLabel}: ${ctx.formattedValue}`
           },
+          footer: (items: TooltipItem<"bar">[]) => {
+            const barItems = items.filter(item => (item.dataset as any).yAxisID === "y")
+            if (barItems.length >= 2) {
+              const problemCount = barItems.find(item => item.dataset.label === "完成题目数")?.parsed.y || 0
+              const submissionCount = barItems.find(item => item.dataset.label === "总提交次数")?.parsed.y || 0
+              const efficiency = submissionCount > 0 ? ((problemCount / submissionCount) * 100).toFixed(1) : "0"
+              return `AC率: ${efficiency}%`
+            }
+            return ""
+          },
         },
       },
     },
diff --git a/src/oj/ai/components/EfficiencyChart.vue b/src/oj/ai/components/EfficiencyChart.vue
new file mode 100644
index 0000000..3bbb2c6
--- /dev/null
+++ b/src/oj/ai/components/EfficiencyChart.vue
@@ -0,0 +1,236 @@
+<template>
+  <n-card :title="title" size="small" v-if="show">
+    <template #header-extra>
+      <n-text depth="3" style="font-size: 12px">
+        反映刷题质量提升
+      </n-text>
+    </template>
+    <div class="chart">
+      <Chart type="line" :data="data" :options="options" />
+    </div>
+  </n-card>
+</template>
+<script setup lang="ts">
+import type { ChartData, ChartOptions, TooltipItem } from "chart.js"
+import { Chart } from "vue-chartjs"
+import {
+  Chart as ChartJS,
+  CategoryScale,
+  LinearScale,
+  PointElement,
+  LineElement,
+  Title,
+  Tooltip,
+  Legend,
+  Filler,
+} from "chart.js"
+import { useAIStore } from "oj/store/ai"
+import { parseTime } from "utils/functions"
+
+// 注册折线图所需的 Chart.js 组件
+ChartJS.register(
+  CategoryScale,
+  LinearScale,
+  PointElement,
+  LineElement,
+  Title,
+  Tooltip,
+  Legend,
+  Filler,
+)
+
+const aiStore = useAIStore()
+
+const title = computed(() => {
+  if (aiStore.duration === "months:2") {
+    return "过去两个月的每周提交效率"
+  } else if (aiStore.duration === "months:6") {
+    return "过去半年的每月提交效率"
+  } else if (aiStore.duration === "years:1") {
+    return "过去一年的每月提交效率"
+  } else {
+    return "过去四周的提交效率"
+  }
+})
+
+// 判断是否有数据
+const show = computed(() => {
+  return aiStore.durationData.length > 0
+})
+
+// 计算提交效率数据
+const efficiencyData = computed(() => {
+  return aiStore.durationData.map((duration) => {
+    const problemCount = duration.problem_count || 0
+    const submissionCount = duration.submission_count || 0
+    
+    // 计算效率：提交次数/完成题目数
+    // 值越接近1，说明一次AC率越高
+    const efficiency = problemCount > 0 ? submissionCount / problemCount : 0
+    
+    // 计算一次AC率（百分比）
+    const onePassRate = problemCount > 0 ? (problemCount / submissionCount) * 100 : 0
+    
+    return {
+      label: [
+        parseTime(duration.start, "M月D日"),
+        parseTime(duration.end, "M月D日"),
+      ].join("～"),
+      efficiency: efficiency,
+      onePassRate: onePassRate,
+      problemCount: problemCount,
+      submissionCount: submissionCount,
+    }
+  })
+})
+
+// 图表数据
+const data = computed<ChartData<"line">>(() => {
+  const efficiency = efficiencyData.value
+
+  return {
+    labels: efficiency.map((e) => e.label),
+    datasets: [
+      {
+        label: "平均提交次数",
+        data: efficiency.map((e) => e.efficiency),
+        borderColor: "rgb(99, 102, 241)",
+        backgroundColor: "rgba(99, 102, 241, 0.1)",
+        tension: 0.4,
+        fill: true,
+        pointRadius: 5,
+        pointHoverRadius: 7,
+        borderWidth: 2.5,
+        pointBackgroundColor: "rgb(99, 102, 241)",
+        pointBorderColor: "#fff",
+        pointBorderWidth: 2,
+        yAxisID: "y",
+      },
+      {
+        label: "一次AC率",
+        data: efficiency.map((e) => e.onePassRate),
+        borderColor: "rgb(34, 197, 94)",
+        backgroundColor: "rgba(34, 197, 94, 0.1)",
+        tension: 0.4,
+        fill: true,
+        pointRadius: 5,
+        pointHoverRadius: 7,
+        borderWidth: 2.5,
+        pointBackgroundColor: "rgb(34, 197, 94)",
+        pointBorderColor: "#fff",
+        pointBorderWidth: 2,
+        yAxisID: "y1",
+      },
+    ],
+  }
+})
+
+// 图表配置
+const options = computed<ChartOptions<"line">>(() => {
+  return {
+    responsive: true,
+    maintainAspectRatio: false,
+    interaction: {
+      mode: "index",
+      intersect: false,
+    },
+    scales: {
+      x: {
+        ticks: {
+          maxRotation: 0,
+          minRotation: 0,
+          autoSkip: true,
+        },
+      },
+      y: {
+        type: "linear",
+        position: "left",
+        title: {
+          display: true,
+          text: "平均提交次数（次/题）",
+          font: {
+            size: 13,
+          },
+        },
+        beginAtZero: true,
+        ticks: {
+          callback: function (value: string | number) {
+            return Number(value).toFixed(1)
+          },
+        },
+      },
+      y1: {
+        type: "linear",
+        position: "right",
+        min: 0,
+        max: 100,
+        title: {
+          display: true,
+          text: "一次AC率（%）",
+          font: {
+            size: 13,
+          },
+        },
+        ticks: {
+          callback: function (value: string | number) {
+            return Number(value).toFixed(0) + "%"
+          },
+        },
+        grid: {
+          drawOnChartArea: false,
+        },
+      },
+    },
+    plugins: {
+      title: {
+        display: false,
+      },
+      tooltip: {
+        backgroundColor: "rgba(0, 0, 0, 0.8)",
+        padding: 12,
+        callbacks: {
+          label: function (ctx: TooltipItem<"line">) {
+            const index = ctx.dataIndex
+            const item = efficiencyData.value[index]
+            const dsLabel = ctx.dataset.label || ""
+
+            if (ctx.datasetIndex === 0) {
+              // 平均提交次数
+              return [
+                `${dsLabel}: ${item.efficiency.toFixed(2)} 次/题`,
+                `完成题目: ${item.problemCount} 题`,
+                `总提交: ${item.submissionCount} 次`,
+              ]
+            } else {
+              // 一次AC率
+              return [
+                `${dsLabel}: ${item.onePassRate.toFixed(1)}%`,
+                `提示: 值越高表示刷题质量越好`,
+              ]
+            }
+          },
+        },
+      },
+      legend: {
+        display: true,
+        position: "bottom" as const,
+        labels: {
+          boxWidth: 12,
+          boxHeight: 12,
+          padding: 8,
+          font: {
+            size: 12,
+          },
+        },
+      },
+    },
+  }
+})
+</script>
+<style scoped>
+.chart {
+  height: 300px;
+  width: 100%;
+}
+</style>
+
diff --git a/src/oj/ai/components/GradeChart.vue b/src/oj/ai/components/GradeChart.vue
deleted file mode 100644
index 30b8199..0000000
--- a/src/oj/ai/components/GradeChart.vue
+++ /dev/null
@@ -1,93 +0,0 @@
-<template>
-  <n-card title="等级统计" size="small" v-if="show">
-    <Bar :data="data" :options="options" />
-  </n-card>
-</template>
-<script setup lang="ts">
-import { Bar } from "vue-chartjs"
-import {
-  Chart as ChartJS,
-  CategoryScale,
-  LinearScale,
-  BarElement,
-  Title,
-  Tooltip,
-  Legend,
-  Colors,
-} from "chart.js"
-import { Grade } from "utils/types"
-import { useAIStore } from "oj/store/ai"
-
-// 仅注册柱状图所需的 Chart.js 组件
-ChartJS.register(
-  CategoryScale,
-  LinearScale,
-  BarElement,
-  Title,
-  Tooltip,
-  Legend,
-  Colors,
-)
-
-const aiStore = useAIStore()
-
-const gradeOrder = ["S", "A", "B", "C"]
-
-const grades = computed(() =>
-  aiStore.detailsData.solved.map((item) => item.grade),
-)
-
-// 统计每个等级的题目数量
-const gradeCount = computed(() => {
-  const count: { [key: string]: number } = {
-    C: 0,
-    B: 0,
-    A: 0,
-    S: 0,
-  }
-  grades.value.forEach((grade) => {
-    if (grade && grade in count) {
-      count[grade]++
-    }
-  })
-  return count
-})
-
-const show = computed(() => {
-  return grades.value.length > 0
-})
-
-const data = computed(() => {
-  return {
-    labels: gradeOrder,
-    datasets: [
-      {
-        data: gradeOrder.map((grade) => gradeCount.value[grade]),
-        backgroundColor: ["#FF6384", "#FFCE56", "#36A2EB", "#95F204"],
-      },
-    ],
-  }
-})
-
-const options = {
-  interaction: {
-    intersect: false,
-  },
-  maintainAspectRatio: false,
-  scales: {
-    y: {
-      ticks: {
-        stepSize: 1,
-      },
-    },
-  },
-  plugins: {
-    legend: {
-      display: false,
-    },
-    title: {
-      display: false,
-    },
-  },
-}
-</script>
diff --git a/src/oj/ai/components/Heatmap.vue b/src/oj/ai/components/Heatmap.vue
index 40d6527..8ab9cc3 100644
--- a/src/oj/ai/components/Heatmap.vue
+++ b/src/oj/ai/components/Heatmap.vue
@@ -1,5 +1,10 @@
 <template>
   <n-card title="过去一年的提交热力图" size="small">
+    <template #header-extra>
+      <n-text depth="3" style="font-size: 12px">
+        激励持续学习
+      </n-text>
+    </template>
     <n-spin :show="aiStore.loading.heatmap">
       <div class="heatmap-container" ref="containerRef">
         <svg
@@ -41,18 +46,6 @@
           </g>
         </svg>
 
-        <div class="legend">
-          <span>少</span>
-          <div class="legend-colors">
-            <div
-              v-for="(color, i) in COLORS"
-              :key="i"
-              :style="{ backgroundColor: color }"
-            />
-          </div>
-          <span>多</span>
-        </div>
-
         <div v-if="tooltip" class="tooltip" :style="tooltipStyle">
           <div class="tooltip-date">{{ tooltip.date }}</div>
           <div class="tooltip-count" :class="{ active: tooltip.count > 0 }">
@@ -77,7 +70,6 @@ const CELL_TOTAL = CELL_SIZE + CELL_GAP
 const DAY_WIDTH = 20
 const MONTH_HEIGHT = 20
 const RIGHT_PADDING = 5
-const LEGEND_HEIGHT = 20
 const COLORS = ["#ebedf0", "#c6e48b", "#7bc96f", "#239a3b", "#196127"]
 const WEEK_DAYS = ["", "一", "", "三", "", "五", ""]
 
@@ -129,7 +121,7 @@ const svgWidth = computed(
     DAY_WIDTH + Math.ceil(cells.value.length / 7) * CELL_TOTAL + RIGHT_PADDING,
 )
 
-const svgHeight = computed(() => MONTH_HEIGHT + 7 * CELL_TOTAL + LEGEND_HEIGHT)
+const svgHeight = computed(() => MONTH_HEIGHT + 7 * CELL_TOTAL)
 
 interface Cell {
   date: Date
@@ -208,28 +200,6 @@ const hideTooltip = () => {
   filter: brightness(0.9);
 }
 
-.legend {
-  display: flex;
-  align-items: center;
-  justify-content: flex-end;
-  gap: 4px;
-  margin-top: 10px;
-  font-size: 12px;
-  opacity: 0.7;
-}
-
-.legend-colors {
-  display: flex;
-  gap: 3px;
-}
-
-.legend-colors > div {
-  width: 12px;
-  height: 12px;
-  border-radius: 2px;
-  border: 1px solid rgba(0, 0, 0, 0.05);
-}
-
 .tooltip {
   position: absolute;
   transform: translate(-50%, -100%);
diff --git a/src/oj/ai/components/ProgressChart.vue b/src/oj/ai/components/ProgressChart.vue
index 1071e0d..4ccefd1 100644
--- a/src/oj/ai/components/ProgressChart.vue
+++ b/src/oj/ai/components/ProgressChart.vue
@@ -1,5 +1,10 @@
 <template>
   <n-card :title="title" size="small" v-if="show">
+    <template #header-extra>
+      <n-text depth="3" style="font-size: 12px">
+        追踪学习成长轨迹
+      </n-text>
+    </template>
     <div class="chart">
       <Chart type="line" :data="data" :options="options" />
     </div>
@@ -23,7 +28,6 @@ import {
 import { useAIStore } from "oj/store/ai"
 import { parseTime } from "utils/functions"
 import type { Grade } from "utils/types"
-import { DURATION_OPTIONS } from "utils/constants"
 
 // 注册折线图所需的 Chart.js 组件
 ChartJS.register(
@@ -49,49 +53,54 @@ const gradeColors: Record<Grade, string> = {
 }
 
 const title = computed(() => {
-  const option = DURATION_OPTIONS.find((opt) => opt.value === aiStore.duration)
-  return option ? `${option.label}的进步曲线` : "进步曲线"
+  if (aiStore.duration === "months:2") {
+    return "过去两个月的进步曲线"
+  } else if (aiStore.duration === "months:6") {
+    return "过去半年的进步曲线"
+  } else if (aiStore.duration === "years:1") {
+    return "过去一年的进步曲线"
+  } else {
+    return "过去四周的进步曲线"
+  }
 })
 
 // 判断是否有数据
 const show = computed(() => {
-  return aiStore.detailsData.solved.length > 0
-})
-
-// 按时间排序的题目列表
-const sortedProblems = computed(() => {
-  return [...aiStore.detailsData.solved].sort(
-    (a, b) => new Date(a.ac_time).getTime() - new Date(b.ac_time).getTime(),
-  )
+  return aiStore.durationData.length > 0
 })
 
 // 计算累计题目数量和等级趋势
 const progressData = computed(() => {
-  const problems = sortedProblems.value
   let cumulativeCount = 0
-  const gradeValues: { [key: string]: number } = { C: 0, B: 0, A: 0, S: 0 }
+  let totalWeightedGrade = 0 // 累计加权等级
+  let totalProblems = 0 // 累计题目总数
 
-  return problems.map((problem) => {
-    cumulativeCount++
-    const grade = problem.grade || "C"
-    gradeValues[grade]++
+  return aiStore.durationData.map((duration) => {
+    const problemCount = duration.problem_count || 0
+    cumulativeCount += problemCount
 
-    // 计算平均等级（加权平均）
-    let totalWeight = 0
-    let weightedSum = 0
-    for (const [g, count] of Object.entries(gradeValues)) {
-      totalWeight += count
-      weightedSum += gradeOrder.indexOf(g as Grade) * count
-    }
-    const avgGrade = totalWeight > 0 ? weightedSum / totalWeight : 0
+    // 计算本期等级的权重值
+    const currentGradeValue = gradeOrder.indexOf(duration.grade || "C")
+    
+    // 累加加权等级
+    totalWeightedGrade += currentGradeValue * problemCount
+    totalProblems += problemCount
+
+    // 计算累计平均等级
+    const avgGradeValue = totalProblems > 0 ? totalWeightedGrade / totalProblems : 0
 
     return {
-      time: parseTime(problem.ac_time, "M/D"),
-      fullTime: parseTime(problem.ac_time, "YYYY-MM-DD HH:mm:ss"),
+      label: [
+        parseTime(duration.start, "M月D日"),
+        parseTime(duration.end, "M月D日"),
+      ].join("～"),
+      start: parseTime(duration.start, "YYYY-MM-DD"),
+      end: parseTime(duration.end, "YYYY-MM-DD"),
       count: cumulativeCount,
-      grade: problem.grade || "C",
-      avgGrade: avgGrade,
-      problem: problem.problem,
+      grade: duration.grade || "C",
+      gradeValue: currentGradeValue,
+      avgGradeValue: avgGradeValue, // 累计平均等级
+      problemCount: problemCount,
     }
   })
 })
@@ -101,7 +110,7 @@ const data = computed<ChartData<"line">>(() => {
   const progress = progressData.value
 
   return {
-    labels: progress.map((p) => p.time),
+    labels: progress.map((p) => p.label),
     datasets: [
       {
         type: "line",
@@ -109,27 +118,30 @@ const data = computed<ChartData<"line">>(() => {
         data: progress.map((p) => p.count),
         borderColor: "#4CAF50",
         backgroundColor: "rgba(76, 175, 80, 0.1)",
-        tension: 0.3,
+        tension: 0.4,
         yAxisID: "y",
         fill: true,
-        pointRadius: 4,
-        pointHoverRadius: 6,
-        borderWidth: 2,
+        pointRadius: 5,
+        pointHoverRadius: 7,
+        borderWidth: 2.5,
+        pointBackgroundColor: "#4CAF50",
+        pointBorderColor: "#fff",
+        pointBorderWidth: 2,
       },
       {
         type: "line",
-        label: "平均等级",
-        data: progress.map((p) => p.avgGrade),
+        label: "累计平均等级",
+        data: progress.map((p) => p.avgGradeValue),
         borderColor: "#FF9800",
         backgroundColor: "rgba(255, 152, 0, 0.1)",
-        tension: 0.3,
+        tension: 0.4,
         yAxisID: "y1",
         fill: false,
-        pointRadius: 4,
-        pointHoverRadius: 6,
-        borderWidth: 2,
+        pointRadius: 5,
+        pointHoverRadius: 7,
+        borderWidth: 2.5,
         pointBackgroundColor: progress.map((p) => gradeColors[p.grade]),
-        pointBorderColor: progress.map((p) => gradeColors[p.grade]),
+        pointBorderColor: "#fff",
         pointBorderWidth: 2,
       },
     ],
@@ -176,14 +188,14 @@ const options = computed<ChartOptions<"line">>(() => {
         max: gradeOrder.length - 0.5,
         title: {
           display: true,
-          text: "平均等级",
+          text: "累计平均等级",
           font: {
             size: 14,
           },
         },
         ticks: {
           stepSize: 1,
-          callback: (v) => {
+          callback: (v: string | number) => {
             const idx = Math.round(Number(v))
             return gradeOrder[idx] || ""
           },
@@ -198,41 +210,51 @@ const options = computed<ChartOptions<"line">>(() => {
         display: false,
       },
       tooltip: {
+        backgroundColor: "rgba(0, 0, 0, 0.8)",
+        padding: 12,
         callbacks: {
           title: (items: TooltipItem<"line">[]) => {
             if (items.length > 0) {
               const idx = items[0].dataIndex
-              return progressData.value[idx]?.fullTime || ""
+              const progress = progressData.value[idx]
+              return progress ? `${progress.start} ~ ${progress.end}` : ""
             }
             return ""
           },
           label: (ctx: TooltipItem<"line">) => {
             const dsLabel = ctx.dataset.label || ""
             const idx = ctx.dataIndex
+            const progress = progressData.value[idx]
 
-            if ((ctx.dataset as any).yAxisID === "y1") {
-              const progress = progressData.value[idx]
-              if (progress) {
-                const avgIdx = Math.round(Number(ctx.parsed.y))
-                return [
-                  `${dsLabel}: ${gradeOrder[avgIdx] || ""}`,
-                  `当前题目等级: ${progress.grade}`,
-                  `题目: ${progress.problem.title}`,
-                ]
-              }
-            } else {
+            if (!progress) {
               return `${dsLabel}: ${ctx.formattedValue}`
             }
-            return `${dsLabel}: ${ctx.formattedValue}`
+
+            if ((ctx.dataset as any).yAxisID === "y1") {
+              // 累计平均等级轴
+              const avgIdx = Math.round(Number(ctx.parsed.y))
+              return [
+                `${dsLabel}: ${gradeOrder[avgIdx] || ""}`,
+                `本期等级: ${progress.grade}`,
+                `本期完成: ${progress.problemCount} 题`,
+              ]
+            } else {
+              // 累计题目数轴
+              return [
+                `${dsLabel}: ${ctx.formattedValue} 题`,
+                `本期完成: ${progress.problemCount} 题`,
+              ]
+            }
           },
         },
       },
       legend: {
         display: true,
-        position: "top",
+        position: "bottom" as const,
         labels: {
-          usePointStyle: true,
-          padding: 15,
+          boxWidth: 12,
+          boxHeight: 12,
+          padding: 8,
           font: {
             size: 12,
           },
diff --git a/src/oj/ai/components/RankDistributionChart.vue b/src/oj/ai/components/RankDistributionChart.vue
new file mode 100644
index 0000000..bb00053
--- /dev/null
+++ b/src/oj/ai/components/RankDistributionChart.vue
@@ -0,0 +1,134 @@
+<template>
+  <n-card title="解题排名分布" size="small" v-if="show">
+    <template #header-extra>
+      <n-text depth="3" style="font-size: 12px">
+        了解解题速度和竞争力
+      </n-text>
+    </template>
+    <div style="height: 300px">
+      <Pie :data="data" :options="options" />
+    </div>
+  </n-card>
+</template>
+
+<script setup lang="ts">
+import { Pie } from "vue-chartjs"
+import {
+  Chart as ChartJS,
+  ArcElement,
+  Title,
+  Tooltip,
+  Legend,
+} from "chart.js"
+import { useAIStore } from "oj/store/ai"
+
+ChartJS.register(ArcElement, Title, Tooltip, Legend)
+
+const aiStore = useAIStore()
+
+// 排名区间定义
+const RANK_RANGES = [
+  { label: "前10%", min: 0, max: 10, color: "#FF6384" },
+  { label: "10-30%", min: 10, max: 30, color: "#FFCE56" },
+  { label: "30-50%", min: 30, max: 50, color: "#36A2EB" },
+  { label: "50-70%", min: 50, max: 70, color: "#4BC0C0" },
+  { label: "70%以后", min: 70, max: 100, color: "#9966FF" },
+]
+
+// 计算每道题的排名百分位并分类
+const rankDistribution = computed(() => {
+  const distribution = RANK_RANGES.map((range) => ({
+    ...range,
+    count: 0,
+    problems: [] as string[],
+  }))
+
+  aiStore.detailsData.solved.forEach((item) => {
+    const rank = item.rank
+    const acCount = item.ac_count
+
+    if (rank && acCount && acCount > 0) {
+      // 计算百分位：(rank / acCount) * 100
+      // 例如：第5名/共100人 = 5%
+      const percentile = (rank / acCount) * 100
+
+      // 找到对应的区间
+      const rangeIndex = RANK_RANGES.findIndex(
+        (r) => percentile >= r.min && percentile < r.max,
+      )
+
+      if (rangeIndex !== -1) {
+        distribution[rangeIndex].count++
+        distribution[rangeIndex].problems.push(
+          `${item.problem.display_id}: ${item.problem.title}`,
+        )
+      }
+    }
+  })
+
+  return distribution
+})
+
+const show = computed(() => {
+  return aiStore.detailsData.solved.length > 0
+})
+
+const data = computed(() => {
+  return {
+    labels: RANK_RANGES.map((r) => r.label),
+    datasets: [
+      {
+        label: "题目数量",
+        data: rankDistribution.value.map((r) => r.count),
+        backgroundColor: RANK_RANGES.map((r) => r.color),
+        borderColor: RANK_RANGES.map((r) => r.color),
+        borderWidth: 1,
+      },
+    ],
+  }
+})
+
+const options = {
+  responsive: true,
+  maintainAspectRatio: false,
+  plugins: {
+    legend: {
+      display: true,
+      position: "bottom" as const,
+      labels: {
+        boxWidth: 12,
+        boxHeight: 12,
+        padding: 8,
+        font: {
+          size: 12,
+        },
+      },
+    },
+    title: {
+      display: false,
+    },
+    tooltip: {
+      callbacks: {
+        label: (context: any) => {
+          const count = context.parsed
+          const total = rankDistribution.value.reduce((sum, r) => sum + r.count, 0)
+          const percentage = total > 0 ? ((count / total) * 100).toFixed(1) : "0.0"
+          const label = context.label || ""
+          return `${label}: ${count} 道题 (${percentage}%)`
+        },
+        afterLabel: (context: any) => {
+          const index = context.dataIndex
+          const problems = rankDistribution.value[index].problems
+          if (problems.length > 0 && problems.length <= 5) {
+            return problems
+          } else if (problems.length > 5) {
+            return [...problems.slice(0, 3), `... 还有 ${problems.length - 3} 道题`]
+          }
+          return ""
+        },
+      },
+    },
+  },
+}
+</script>
+
diff --git a/src/oj/ai/components/StreakStats.vue b/src/oj/ai/components/StreakStats.vue
new file mode 100644
index 0000000..7e7541a
--- /dev/null
+++ b/src/oj/ai/components/StreakStats.vue
@@ -0,0 +1,178 @@
+<template>
+  <n-card title="连续做题统计" size="small">
+    <template #header-extra>
+      <n-text depth="3" style="font-size: 12px">
+        激励持续学习
+      </n-text>
+    </template>
+    <n-spin :show="aiStore.loading.heatmap">
+      <n-grid :cols="2" :x-gap="12" :y-gap="12">
+        <n-gi>
+          <n-statistic label="当前连续" :value="currentStreak">
+            <template #suffix>
+              <span style="font-size: 14px">天</span>
+              <span v-if="currentStreak > 0" style="font-size: 20px; margin-left: 4px">
+                🔥
+              </span>
+            </template>
+          </n-statistic>
+        </n-gi>
+        <n-gi>
+          <n-statistic label="最长连续" :value="maxStreak">
+            <template #suffix>
+              <span style="font-size: 14px">天</span>
+              <span v-if="maxStreak >= 7" style="font-size: 20px; margin-left: 4px">
+                ⭐
+              </span>
+            </template>
+          </n-statistic>
+        </n-gi>
+        <n-gi>
+          <n-statistic label="本周做题" :value="weekCount">
+            <template #suffix>
+              <span style="font-size: 14px">天</span>
+            </template>
+          </n-statistic>
+        </n-gi>
+        <n-gi>
+          <n-statistic label="本月做题" :value="monthCount">
+            <template #suffix>
+              <span style="font-size: 14px">天</span>
+            </template>
+          </n-statistic>
+        </n-gi>
+      </n-grid>
+      <n-divider style="margin: 12px 0" />
+      <n-flex vertical size="small">
+        <n-text depth="2" style="font-size: 12px">
+          <span v-if="currentStreak === 0">
+            开始做题，建立学习连续记录！
+          </span>
+          <span v-else-if="currentStreak < 3">
+            继续保持，争取连续3天！
+          </span>
+          <span v-else-if="currentStreak < 7">
+            很棒！继续保持一周连续记录！
+          </span>
+          <span v-else-if="currentStreak < 30">
+            太棒了！坚持满30天将获得「持之以恒」成就！
+          </span>
+          <span v-else>
+            🎉 恭喜你！你已经连续学习 {{ currentStreak }} 天，真的非常厉害！
+          </span>
+        </n-text>
+      </n-flex>
+    </n-spin>
+  </n-card>
+</template>
+
+<script setup lang="ts">
+import { useAIStore } from "oj/store/ai"
+
+const aiStore = useAIStore()
+
+// 计算连续天数
+const streakData = computed(() => {
+  const heatmap = aiStore.heatmapData
+  if (!heatmap || heatmap.length === 0) {
+    return {
+      currentStreak: 0,
+      maxStreak: 0,
+      weekCount: 0,
+      monthCount: 0,
+    }
+  }
+
+  // 按时间戳排序
+  const sortedData = [...heatmap].sort((a, b) => a.timestamp - b.timestamp)
+
+  let currentStreak = 0
+  let maxStreak = 0
+  let tempStreak = 0
+  let lastDate: Date | null = null
+
+  const now = new Date()
+  const today = new Date(now.getFullYear(), now.getMonth(), now.getDate())
+  const weekAgo = new Date(today.getTime() - 7 * 24 * 60 * 60 * 1000)
+  const monthAgo = new Date(today.getTime() - 30 * 24 * 60 * 60 * 1000)
+
+  let weekCount = 0
+  let monthCount = 0
+
+  // 检查今天是否有做题
+  const todayData = sortedData.find((item) => {
+    const itemDate = new Date(item.timestamp)
+    return (
+      itemDate.getFullYear() === today.getFullYear() &&
+      itemDate.getMonth() === today.getMonth() &&
+      itemDate.getDate() === today.getDate()
+    )
+  })
+  const hasToday = todayData && todayData.value > 0
+
+  // 遍历数据计算连续天数
+  for (const item of sortedData) {
+    if (item.value > 0) {
+      const currentDate = new Date(item.timestamp)
+
+      // 统计本周和本月
+      if (currentDate >= weekAgo) {
+        weekCount++
+      }
+      if (currentDate >= monthAgo) {
+        monthCount++
+      }
+
+      if (lastDate === null) {
+        tempStreak = 1
+      } else {
+        const dayDiff = Math.floor(
+          (currentDate.getTime() - lastDate.getTime()) / (24 * 60 * 60 * 1000),
+        )
+        if (dayDiff === 1) {
+          tempStreak++
+        } else {
+          maxStreak = Math.max(maxStreak, tempStreak)
+          tempStreak = 1
+        }
+      }
+
+      lastDate = currentDate
+    }
+  }
+
+  maxStreak = Math.max(maxStreak, tempStreak)
+
+  // 计算当前连续天数（必须包含今天或昨天）
+  if (lastDate) {
+    const yesterday = new Date(today.getTime() - 24 * 60 * 60 * 1000)
+    const lastDateOnly = new Date(
+      lastDate.getFullYear(),
+      lastDate.getMonth(),
+      lastDate.getDate(),
+    )
+
+    if (
+      lastDateOnly.getTime() === today.getTime() ||
+      lastDateOnly.getTime() === yesterday.getTime()
+    ) {
+      currentStreak = tempStreak
+    } else {
+      currentStreak = 0
+    }
+  }
+
+  return {
+    currentStreak,
+    maxStreak,
+    weekCount,
+    monthCount,
+  }
+})
+
+const currentStreak = computed(() => streakData.value.currentStreak)
+const maxStreak = computed(() => streakData.value.maxStreak)
+const weekCount = computed(() => streakData.value.weekCount)
+const monthCount = computed(() => streakData.value.monthCount)
+</script>
+
diff --git a/src/oj/ai/components/TagsChart.vue b/src/oj/ai/components/TagsChart.vue
deleted file mode 100644
index 35a2f6f..0000000
--- a/src/oj/ai/components/TagsChart.vue
+++ /dev/null
@@ -1,65 +0,0 @@
-<template>
-  <n-card :title="title" size="small" v-if="show">
-    <div class="chart">
-      <Pie :data="data" :options="options" />
-    </div>
-  </n-card>
-</template>
-<script setup lang="ts">
-import { Pie } from "vue-chartjs"
-import {
-  Chart as ChartJS,
-  ArcElement,
-  Title,
-  Tooltip,
-  Legend,
-  Colors,
-} from "chart.js"
-import { useAIStore } from "oj/store/ai"
-
-// 仅注册饼图所需的 Chart.js 组件
-ChartJS.register(ArcElement, Title, Tooltip, Legend, Colors)
-
-const aiStore = useAIStore()
-
-const show = computed(() => {
-  return Object.keys(aiStore.detailsData.tags).length > 0
-})
-
-const title = computed(() => {
-  return `标签分布（前${Object.keys(aiStore.detailsData.tags).length}个）`
-})
-
-const data = computed(() => {
-  return {
-    labels: Object.keys(aiStore.detailsData.tags),
-    datasets: [
-      {
-        data: Object.values(aiStore.detailsData.tags),
-        backgroundColor: [
-          "#FF6384",
-          "#36A2EB",
-          "#FFCE56",
-          "#4BC0C0",
-          "#9966FF",
-        ],
-      },
-    ],
-  }
-})
-
-const options = computed(() => {
-  return {
-    interaction: {
-      intersect: false,
-    },
-    maintainAspectRatio: false,
-  }
-})
-</script>
-<style scoped>
-.chart {
-  height: 100%;
-  width: 100%;
-}
-</style>
diff --git a/src/oj/ai/components/TagsRadarChart.vue b/src/oj/ai/components/TagsRadarChart.vue
new file mode 100644
index 0000000..d54550b
--- /dev/null
+++ b/src/oj/ai/components/TagsRadarChart.vue
@@ -0,0 +1,156 @@
+<template>
+  <n-card :title="title" size="small" v-if="show">
+    <template #header-extra>
+      <n-text depth="3" style="font-size: 12px">
+        可视化知识点覆盖面
+      </n-text>
+    </template>
+    <div class="chart">
+      <Radar :data="data" :options="options" />
+    </div>
+  </n-card>
+</template>
+<script setup lang="ts">
+import { Radar } from "vue-chartjs"
+import {
+  Chart as ChartJS,
+  RadialLinearScale,
+  PointElement,
+  LineElement,
+  Filler,
+  Tooltip,
+  Legend,
+} from "chart.js"
+import { useAIStore } from "oj/store/ai"
+
+// 注册雷达图所需的 Chart.js 组件
+ChartJS.register(
+  RadialLinearScale,
+  PointElement,
+  LineElement,
+  Filler,
+  Tooltip,
+  Legend,
+)
+
+const aiStore = useAIStore()
+
+const show = computed(() => {
+  return Object.keys(aiStore.detailsData.tags).length > 0
+})
+
+// 最多显示前10个标签，避免雷达图过于拥挤
+const MAX_TAGS = 10
+
+const title = computed(() => {
+  const totalTags = Object.keys(aiStore.detailsData.tags).length
+  const displayTags = Math.min(totalTags, MAX_TAGS)
+  return `标签雷达图（前${displayTags}个）`
+})
+
+// 计算归一化的数据（用于雷达图展示）
+const normalizedData = computed(() => {
+  const tags = aiStore.detailsData.tags
+
+  // 按题目数量降序排序，取前MAX_TAGS个
+  const sortedTags = Object.entries(tags)
+    .sort(([, a], [, b]) => b - a)
+    .slice(0, MAX_TAGS)
+
+  const values = sortedTags.map(([, value]) => value)
+  const maxValue = Math.max(...values, 1) // 避免除以0
+
+  // 归一化到0-100的范围
+  return sortedTags.map(([label, value]) => ({
+    label,
+    value,
+    normalized: (value / maxValue) * 100,
+  }))
+})
+
+const data = computed(() => {
+  const tagData = normalizedData.value
+
+  return {
+    labels: tagData.map((item) => item.label),
+    datasets: [
+      {
+        label: "掌握程度",
+        data: tagData.map((item) => item.normalized),
+        backgroundColor: "rgba(99, 102, 241, 0.25)",
+        borderColor: "rgb(99, 102, 241)",
+        borderWidth: 2.5,
+        pointBackgroundColor: "rgb(99, 102, 241)",
+        pointBorderColor: "#fff",
+        pointHoverBackgroundColor: "#fff",
+        pointHoverBorderColor: "rgb(99, 102, 241)",
+        pointRadius: 5,
+        pointHoverRadius: 7,
+        pointBorderWidth: 2,
+      },
+    ],
+  }
+})
+
+const options = computed(() => {
+  const tagData = normalizedData.value
+
+  return {
+    responsive: true,
+    maintainAspectRatio: false,
+    scales: {
+      r: {
+        beginAtZero: true,
+        max: 100,
+        min: 0,
+        ticks: {
+          stepSize: 20,
+          backdropColor: "transparent",
+          callback: function (value: string | number) {
+            return Number(value) + "%"
+          },
+          font: {
+            size: 11,
+          },
+        },
+        grid: {
+          color: "rgba(0, 0, 0, 0.1)",
+          circular: true,
+        },
+        angleLines: {
+          color: "rgba(0, 0, 0, 0.1)",
+        },
+        pointLabels: {
+          font: {
+            size: 13,
+            weight: 500 as const,
+          },
+          padding: 10,
+        },
+      },
+    },
+    plugins: {
+      legend: {
+        display: false,
+      },
+      tooltip: {
+        backgroundColor: "rgba(0, 0, 0, 0.8)",
+        callbacks: {
+          label: function (context: any) {
+            const index = context.dataIndex
+            const actualValue = tagData[index].value
+            const percentage = Math.round(Number(context.parsed.r))
+            return `完成 ${actualValue} 道题 (掌握度 ${percentage}%)`
+          },
+        },
+      },
+    },
+  }
+})
+</script>
+<style scoped>
+.chart {
+  height: 300px;
+  width: 100%;
+}
+</style>
diff --git a/src/oj/ai/components/TimeActivityHeatmap.vue b/src/oj/ai/components/TimeActivityHeatmap.vue
new file mode 100644
index 0000000..4c1a308
--- /dev/null
+++ b/src/oj/ai/components/TimeActivityHeatmap.vue
@@ -0,0 +1,153 @@
+<template>
+  <n-card title="时间活跃度分析" size="small" v-if="show">
+    <template #header-extra>
+      <n-text depth="3" style="font-size: 12px">
+        发现最佳学习时段
+      </n-text>
+    </template>
+    <div style="height: 300px">
+      <Bar :data="data" :options="options" />
+    </div>
+  </n-card>
+</template>
+
+<script setup lang="ts">
+import { Bar } from "vue-chartjs"
+import {
+  Chart as ChartJS,
+  CategoryScale,
+  LinearScale,
+  BarElement,
+  Title,
+  Tooltip,
+  Legend,
+} from "chart.js"
+import { useAIStore } from "oj/store/ai"
+
+ChartJS.register(CategoryScale, LinearScale, BarElement, Title, Tooltip, Legend)
+
+const aiStore = useAIStore()
+
+const WEEKDAYS = ["周日", "周一", "周二", "周三", "周四", "周五", "周六"]
+const TIME_PERIODS = [
+  { label: "凌晨(0-6)", start: 0, end: 6 },
+  { label: "上午(6-12)", start: 6, end: 12 },
+  { label: "下午(12-18)", start: 12, end: 18 },
+  { label: "晚上(18-24)", start: 18, end: 24 },
+]
+
+// 统计每个星期几和时间段的做题数量
+const activityMatrix = computed(() => {
+  const matrix: { [weekday: number]: { [period: number]: number } } = {}
+
+  // 初始化矩阵
+  for (let i = 0; i < 7; i++) {
+    matrix[i] = {}
+    for (let j = 0; j < TIME_PERIODS.length; j++) {
+      matrix[i][j] = 0
+    }
+  }
+
+  // 统计数据
+  aiStore.detailsData.solved.forEach((item) => {
+    const date = new Date(item.ac_time)
+    const weekday = date.getDay() // 0-6，0是周日
+    const hour = date.getHours() // 0-23
+
+    // 找到对应的时间段
+    const periodIndex = TIME_PERIODS.findIndex(
+      (p) => hour >= p.start && hour < p.end,
+    )
+    if (periodIndex !== -1) {
+      matrix[weekday][periodIndex]++
+    }
+  })
+
+  return matrix
+})
+
+const show = computed(() => {
+  return aiStore.detailsData.solved.length > 0
+})
+
+// 为每个时间段准备数据集
+const data = computed(() => {
+  const datasets = TIME_PERIODS.map((period, periodIndex) => {
+    return {
+      label: period.label,
+      data: WEEKDAYS.map((_, weekday) => activityMatrix.value[weekday][periodIndex]),
+      backgroundColor: getTimePeriodColor(periodIndex),
+      borderColor: getTimePeriodColor(periodIndex),
+      borderWidth: 1,
+    }
+  })
+
+  return {
+    labels: WEEKDAYS,
+    datasets,
+  }
+})
+
+// 根据时间段返回对应的颜色
+function getTimePeriodColor(periodIndex: number): string {
+  const colors = [
+    "#9D9D9D", // 凌晨 - 灰色
+    "#FFD700", // 上午 - 金色
+    "#4ECDC4", // 下午 - 青色
+    "#5B5F97", // 晚上 - 深蓝紫
+  ]
+  return colors[periodIndex] || "#999"
+}
+
+const options = {
+  responsive: true,
+  maintainAspectRatio: false,
+  interaction: {
+    intersect: false,
+    mode: "index" as const,
+  },
+  scales: {
+    x: {
+      stacked: true,
+      grid: {
+        display: false,
+      },
+    },
+    y: {
+      stacked: true,
+      ticks: {
+        stepSize: 1,
+      },
+      title: {
+        display: true,
+        text: "完成题目数",
+      },
+    },
+  },
+  plugins: {
+    legend: {
+      display: true,
+      position: "bottom" as const,
+      labels: {
+        boxWidth: 12,
+        padding: 8,
+        font: {
+          size: 11,
+        },
+      },
+    },
+    title: {
+      display: false,
+    },
+    tooltip: {
+      callbacks: {
+        footer: (items: any[]) => {
+          const total = items.reduce((sum, item) => sum + item.parsed.y, 0)
+          return `当天总计: ${total} 题`
+        },
+      },
+    },
+  },
+}
+</script>
+
diff --git a/src/oj/store/ai.ts b/src/oj/store/ai.ts
index c66c8fd..f9f93e7 100644
--- a/src/oj/store/ai.ts
+++ b/src/oj/store/ai.ts
@@ -50,7 +50,6 @@ export const useAIStore = defineStore("ai", () => {
     loading.heatmap = false
   }
 
-  // 统一获取分析数据（details + duration）
   async function fetchAnalysisData(
     start: string,
     end: string,
diff --git a/src/utils/types.ts b/src/utils/types.ts
index 0a13fe2..48765ae 100644
--- a/src/utils/types.ts
+++ b/src/utils/types.ts
@@ -433,6 +433,7 @@ export interface SolvedProblem {
   rank: number
   ac_count: number
   grade: Grade
+  difficulty: string
 }
 
 export interface DetailsData {