diff --git a/CLAUDE.md b/CLAUDE.md
index b0f6938..6c84c85 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -15,8 +15,8 @@ The backend was rewritten from Django in 2026-10 to cut memory use (~25 MB vs. 1
   - `src/app.ts` — mounts routers under `/api/<prefix>`, CORS, auth middleware, error → `{ detail }` JSON (ninja-compatible; validation errors are 422)
   - `src/db.ts` — schema (`CREATE TABLE IF NOT EXISTS`, same DDL as Django), `all/get/run/tx` helpers using `$name` params, time (`now()`, `iso()`) and UUID (`uuidHex()`, `uuidOut()`) conversions
   - `src/auth.ts` — Django-compatible password hashing; JWT login, no cookies: `POST /account/login` returns a 15-min HS256 `access_token` (sent as `Authorization: Bearer`, signed with `JWT_SECRET`, random per process if unset) and a 14-day opaque `refresh_token` (only its sha256 is stored, in `auth_refresh_token`; `POST /account/refresh` trades it for a new access token, logout / password change / deactivation delete it). An invalid or expired Bearer token is a 401 even on public endpoints so the client knows to refresh. `requireUser/requireAdmin/requireSuper` (401 / 403)
-  - `src/routes/` — `account`, `tasks` (tutorial / challenge / creation), `files` (task assets + image upload), `submission`, `showcase` (mounted under `/submission/showcase`), `review` (mounted under `/submission/review`: teacher class × task wall, students' same-class peer works), `prompt`
-  - Who can read a submission (`canView` in `routes/submission.ts`): staff, the owner, anyone if it's in the showcase, or a same-class student who has submitted the same task. Students' `GET /submission/` only lists their own. Peer works and the random-rating item are anonymous until the viewer rates them (`PUT /:id/score` returns the author). `flag` now only carries `present` (teacher's in-class presentation queue); the old four colors are no longer shown
+  - `src/routes/` — `account`, `tasks` (tutorial / challenge / creation), `files` (task assets + image upload), `submission`, `showcase` (mounted under `/submission/showcase`), `review` (mounted under `/submission/review`: teacher class × task wall — no `classname` means all classes —, students' peer works with `scope=class|all`), `prompt`
+  - Who can read a submission (`canView` in `routes/submission.ts`): staff, the owner, anyone if it's in the showcase, or any student who has submitted the same task (any class). Students' `GET /submission/` only lists their own. Peer works and the random-rating item are anonymous until the viewer rates them (`PUT /:id/score` returns the author). `flag` now only carries `present` (teacher's in-class presentation queue); the old four colors are no longer shown
   - `src/services/` — `score.ts` (rating weights super×0.5, admin×0.3, normal×0.2, then Bayesian smoothing with C=3 and zones), `gradebook.ts`, `llm.ts` (OpenAI-compatible streaming via fetch; DeepSeek default, ARK for doubao models; chat context is the last 20 messages with older code blocks elided), `classifier.ts` (Bloom-level L1–L6 prompt tagging, runs in background), `cascade.ts` (Django's CASCADE deletes done by hand, plus the shared delete rules: `hasRatingsOrAwards`, `deleteRound`), `pyround.ts` (`pyRound`/`pySum` reproduce Python's `round()` and `sum()` so scores match the old system bit-for-bit)
   - `src/ws.ts` — `/ws/prompt/<task_id>/?token=<access_token>` (code generation chat; the AI context and the page's chat include `conversation`, `edit` and `manual` messages) and `/ws/guidance/<task_id>/?token=...` (prompt coaching); one message per connection at a time (a message sent while the AI is still replying gets an error, payloads capped at 64 KB); on disconnect the pending user message is deleted and the LLM request aborted
   - `scripts/` — one-off CLIs: `create-superuser.ts`, `classify-prompts.ts`, `recalculate-scores.ts`
@@ -32,7 +32,7 @@ The backend was rewritten from Django in 2026-10 to cut memory use (~25 MB vs. 1
   - `src/icons.ts` — `<Icon icon="lucide:name" />` renders bundled `lucide-vue-next` icons (works offline); register new names in its map. Fonts are bundled too (`@fontsource/jetbrains-mono`)
   - `components/workbench/Workbench.vue` — shared challenge / creation page: left = brief + AI chat (`PromptPanel`), right = preview / code (`CodeTabs`) + `VersionBar`. Every assistant message with code is a version; hand edits and pasted external-AI code are saved as versions via `POST /prompt/versions` (`source` `edit` / `manual`, stored as a user+assistant pair). Challenges are submitted only when the student clicks “交这一版” (`POST /submission/` with `message_id`), never automatically. Editor code is per task (`composables/useTaskCode.ts`, localStorage `web-code:<user>:<task>`); the tutorial page edits the shared `store/editors.ts` refs but `Workspace.vue` saves them under the same per-task key and `TutorialContent` restores them (example code only the first time)
   - `pages/ChallengeHome.vue` — challenge list page; `pages/TaskEditor.vue` (prop `kind`) is the single tutorial / challenge authoring page
-  - `pages/Review.vue` (“批改”, default teaching page) + `components/review/ReviewPanel.vue` (also opened from the gradebook) — keys: J/K next/prev student, 1–5 rate, P present; `components/review/PeersDrawer.vue` is the students' “同学作品”
+  - `pages/Review.vue` (“批改”, default teaching page) + `components/review/ReviewPanel.vue` (also opened from the gradebook) — opens as a large preview (wall hidden, Esc returns; “小面板” switches to a side panel, remembered); keys: J/K next/prev student, 1–5 rate, P present; “全部班级” groups the wall by class; `components/review/PeersDrawer.vue` is the students' “同学作品” (本班 / 全部班级)
   - `components/layout/AppShell.vue` — top bar for every page; `pages/Dashboard.vue` is the teaching sidebar (“教学”) under `/dashboard`
   - `src/store/` — Reactive state (plain Vue refs, not Vuex/Pinia); `prompt.ts` / `guidance.ts` own the WebSockets
   - `src/pages/`, `src/components/` — user management uses `components/dashboard/UserFormModal.vue` (there is no Django Admin anymore)
diff --git a/client/src/api.ts b/client/src/api.ts
index b86a40d..142ab91 100644
--- a/client/src/api.ts
+++ b/client/src/api.ts
@@ -465,18 +465,20 @@ export const Review = {
   async options(): Promise<ReviewOptions> {
     return (await http.get("/submission/review/options")).data
   },
-  async progress(classname: string): Promise<ReviewProgress> {
+  // classname 不传就是全部班级
+  async progress(classname?: string): Promise<ReviewProgress> {
     return (await http.get("/submission/review/progress", { params: { classname } })).data
   },
-  async classWall(classname: string, taskId: number): Promise<ReviewStudent[]> {
+  async classWall(classname: string | undefined, taskId: number): Promise<ReviewStudent[]> {
     return (
       await http.get("/submission/review/class", {
         params: { classname, task_id: taskId },
       })
     ).data
   },
-  async peers(taskId: number): Promise<PeerWorks> {
-    return (await http.get(`/submission/review/peers/${taskId}`)).data
+  // scope：class 只看本班，all 看所有班
+  async peers(taskId: number, scope: "class" | "all" = "class"): Promise<PeerWorks> {
+    return (await http.get(`/submission/review/peers/${taskId}`, { params: { scope } })).data
   },
 }
 
diff --git a/client/src/components/review/PeersDrawer.vue b/client/src/components/review/PeersDrawer.vue
index aaace7a..45feee3 100644
--- a/client/src/components/review/PeersDrawer.vue
+++ b/client/src/components/review/PeersDrawer.vue
@@ -10,9 +10,15 @@
           style="margin-top: 40px"
         />
         <template v-else-if="data">
-          <p class="hint">
-            本班同学在这道题上最新的作品。打分之前不显示是谁做的，打完分才显示。
-          </p>
+          <n-flex justify="space-between" align="center" class="bar">
+            <span class="hint">
+              同学们在这道题上最新的作品。打分之前不显示是谁做的，打完分才显示。
+            </span>
+            <n-radio-group v-model:value="scope" size="small">
+              <n-radio-button value="class">本班</n-radio-button>
+              <n-radio-button value="all">全部班级</n-radio-button>
+            </n-radio-group>
+          </n-flex>
           <n-empty v-if="!data.items.length" description="还没有同学交这道题" />
           <div class="grid">
             <div v-for="w in data.items" :key="w.id" class="work">
@@ -25,7 +31,10 @@
                 ></iframe>
               </button>
               <div class="info">
-                <span :class="{ anon: !w.username }">{{ w.username ?? "匿名同学" }}</span>
+                <span :class="{ anon: !w.username }">
+                  <span v-if="scope === 'all' && w.classname" class="cls">{{ w.classname }} 班</span>
+                  {{ w.username ?? "匿名同学" }}
+                </span>
                 <span v-if="w.my_score" class="mine">我给了 {{ w.my_score }} 分</span>
               </div>
               <div v-if="!w.my_score" class="rates">
@@ -79,19 +88,26 @@ const data = ref<PeerWorks | null>(null)
 const loading = ref(false)
 const rating = ref<string | null>(null)
 const large = ref<PeerWork | null>(null)
+const scope = ref<"class" | "all">("class")
 
 const docOf = (w: PeerWork) =>
   buildPreviewDocument({ html: w.html, css: w.css, js: w.js, assetBaseUrl: props.assetBaseUrl })
 
-watch(show, async (open) => {
-  if (!open || !props.taskId) return
+let seq = 0
+async function load() {
+  if (!props.taskId) return
+  const s = ++seq
   loading.value = true
   try {
-    data.value = await Review.peers(props.taskId)
+    const res = await Review.peers(props.taskId, scope.value)
+    if (s === seq) data.value = res
   } finally {
-    loading.value = false
+    if (s === seq) loading.value = false
   }
-})
+}
+
+watch(show, (open) => open && load())
+watch(scope, load)
 
 async function rate(w: PeerWork, score: number) {
   rating.value = w.id
@@ -107,12 +123,22 @@ async function rate(w: PeerWork, score: number) {
 }
 </script>
 <style scoped>
+.bar {
+  margin-bottom: 12px;
+  flex-wrap: nowrap !important;
+}
+
 .hint {
-  margin: 0 0 12px;
   font-size: 13px;
   color: var(--wp-muted);
 }
 
+.cls {
+  margin-right: 4px;
+  color: var(--wp-muted);
+  font-size: 12px;
+}
+
 .grid {
   display: grid;
   grid-template-columns: repeat(2, minmax(0, 1fr));
diff --git a/client/src/components/review/ReviewPanel.vue b/client/src/components/review/ReviewPanel.vue
index 55d4a58..0c578cb 100644
--- a/client/src/components/review/ReviewPanel.vue
+++ b/client/src/components/review/ReviewPanel.vue
@@ -1,5 +1,5 @@
 <template>
-  <div class="panel">
+  <div :class="['panel', { wide }]">
     <div class="head">
       <div class="who">
         <b>{{ sub?.username ?? "…" }}</b>
@@ -24,14 +24,31 @@
             下一个学生（J）
           </n-tooltip>
         </template>
-        <n-button size="small" quaternary @click="emit('close')">
-          <Icon icon="lucide:x" />
+        <n-button
+          v-if="canWiden"
+          size="small"
+          quaternary
+          @click="emit('toggle-wide')"
+        >
+          <template #icon>
+            <Icon :icon="wide ? 'lucide:minimize-2' : 'lucide:maximize-2'" />
+          </template>
+          {{ wide ? "小面板" : "大图" }}
         </n-button>
+        <n-tooltip>
+          <template #trigger>
+            <n-button size="small" quaternary @click="emit('close')">
+              <Icon icon="lucide:x" />
+            </n-button>
+          </template>
+          {{ wide ? "返回作品墙（Esc）" : "关闭" }}
+        </n-tooltip>
       </n-flex>
     </div>
 
     <n-spin :show="loading" class="body">
-      <template v-if="sub">
+      <div v-if="sub" class="layout">
+       <div class="stage">
         <div class="versions" v-if="versions.length > 1">
           <span class="muted">共交了 {{ versions.length }} 次：</span>
           <button
@@ -53,6 +70,8 @@
           </span>
           <n-button text size="small" @click="openFull">全屏打开</n-button>
         </n-flex>
+       </div>
+       <div class="side">
 
         <section>
           <h4>打分</h4>
@@ -106,7 +125,8 @@
             </li>
           </ol>
         </section>
-      </template>
+       </div>
+      </div>
     </n-spin>
   </div>
 </template>
@@ -128,6 +148,10 @@ import type {
 // 老师看一份提交：预览、交过的各个版本、打分、课上展示、加入作品展、提示词链
 const props = defineProps<{
   submissionId: string
+  // 大图：预览占满左边，打分和提示词放右边一栏
+  wide?: boolean
+  // 是否显示“大图 / 小面板”切换
+  canWiden?: boolean
   // 作品墙里用：能不能切到上一个 / 下一个学生
   nav?: { prev: boolean; next: boolean }
 }>()
@@ -135,6 +159,7 @@ const emit = defineEmits<{
   prev: []
   next: []
   close: []
+  "toggle-wide": []
   // 让作品墙同步更新这张卡片
   changed: [patch: { id: string; my_score?: number; score?: number; flag?: FlagType }]
 }>()
@@ -282,6 +307,41 @@ onUnmounted(() => window.removeEventListener("keydown", onKey))
   padding: 12px 14px 20px;
 }
 
+/* 大图：左边预览占满高度，右边一栏单独滚动 */
+.wide .body {
+  overflow: hidden;
+  padding: 0;
+}
+
+.wide .body :deep(.n-spin-content) {
+  height: 100%;
+}
+
+.wide .layout {
+  height: 100%;
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) 320px;
+}
+
+.wide .stage {
+  display: flex;
+  flex-direction: column;
+  min-height: 0;
+  padding: 12px 14px;
+}
+
+.wide .stage .frame {
+  flex: 1;
+  height: auto;
+  min-height: 0;
+}
+
+.wide .side {
+  border-left: 1px solid var(--wp-line);
+  overflow-y: auto;
+  padding: 0 14px 20px;
+}
+
 .muted {
   color: var(--wp-muted);
   font-size: 12px;
@@ -361,6 +421,11 @@ h4 {
 
 .hint {
   margin-left: 6px;
+  white-space: nowrap;
+}
+
+.wide .rates {
+  flex-wrap: wrap;
 }
 
 .chain {
diff --git a/client/src/icons.ts b/client/src/icons.ts
index d97605f..765bc3e 100644
--- a/client/src/icons.ts
+++ b/client/src/icons.ts
@@ -19,6 +19,8 @@ import {
   Lightbulb,
   List,
   Lock,
+  Maximize2,
+  Minimize2,
   LogOut,
   Monitor,
   Moon,
@@ -54,6 +56,8 @@ const registry: Record<string, Component> = {
   "chevron-up": ChevronUp,
   globe: Globe,
   lock: Lock,
+  "maximize-2": Maximize2,
+  "minimize-2": Minimize2,
   "check-circle": CircleCheck,
   download: Download,
   eye: Eye,
diff --git a/client/src/pages/Gradebook.vue b/client/src/pages/Gradebook.vue
index ac27fd4..9a758f5 100644
--- a/client/src/pages/Gradebook.vue
+++ b/client/src/pages/Gradebook.vue
@@ -85,11 +85,11 @@
   </n-flex>
   <n-drawer
     :show="!!reviewId"
-    :width="400"
+    width="min(1180px, 92vw)"
     placement="right"
     @update:show="(v: boolean) => !v && (reviewId = null)"
   >
-    <ReviewPanel v-if="reviewId" :submission-id="reviewId" @close="reviewId = null" />
+    <ReviewPanel v-if="reviewId" :submission-id="reviewId" wide @close="reviewId = null" />
   </n-drawer>
 </template>
 
diff --git a/client/src/pages/Review.vue b/client/src/pages/Review.vue
index 4401264..a14959d 100644
--- a/client/src/pages/Review.vue
+++ b/client/src/pages/Review.vue
@@ -1,6 +1,6 @@
 <template>
   <div class="review">
-    <aside class="tasks">
+    <aside v-show="!fullDetail" class="tasks">
       <n-select
         v-model:value="classname"
         :options="classOptions"
@@ -25,7 +25,7 @@
       <n-empty v-else description="先选一个班级" size="small" style="margin-top: 40px" />
     </aside>
 
-    <main class="wall">
+    <main v-show="!fullDetail" class="wall">
       <template v-if="task && classname">
         <div class="wall-head">
           <div class="wall-title">
@@ -59,9 +59,15 @@
           </n-flex>
         </div>
         <n-spin :show="loadingWall" class="grid-wrap">
-          <div class="grid">
+          <template v-for="g in groups" :key="g.name">
+          <div v-if="g.name" class="group-head">
+            <b>{{ g.name }} 班</b>
+            <span>已交 {{ g.submitted }} / {{ g.total }}</span>
+            <span v-if="g.collapsed">· 这个班还没有人交，已收起</span>
+          </div>
+          <div v-if="!g.collapsed" class="grid">
             <button
-              v-for="s in visible"
+              v-for="s in g.items"
               :key="s.user_id"
               :class="['card', { sel: s.submission?.id === selectedId, missing: !s.submission }]"
               :disabled="!s.submission"
@@ -86,6 +92,7 @@
               <span v-if="s.submission?.flag === 'present'" class="present">讲评</span>
             </button>
           </div>
+          </template>
           <n-empty
             v-if="!loadingWall && !visible.length"
             description="没有符合条件的学生"
@@ -96,9 +103,12 @@
       <n-empty v-else description="选一个班级和任务开始批改" style="margin-top: 120px" />
     </main>
 
-    <aside v-if="selectedId" class="detail">
+    <aside v-if="selectedId" :class="['detail', { full: fullDetail }]">
       <ReviewPanel
         :submission-id="selectedId"
+        :wide="fullDetail"
+        can-widen
+        @toggle-wide="bigPreview = !bigPreview"
         :nav="{ prev: neighbor(-1) !== null, next: neighbor(1) !== null }"
         @prev="move(-1)"
         @next="move(1)"
@@ -124,6 +134,7 @@
 <script lang="ts" setup>
 import { computed, onMounted, onUnmounted, ref, watch } from "vue"
 import { useRoute, useRouter } from "vue-router"
+import { useStorage } from "@vueuse/core"
 import { Icon } from "../icons"
 import ReviewPanel from "../components/review/ReviewPanel.vue"
 import { Review } from "../api"
@@ -143,9 +154,18 @@ const taskId = ref<number | null>(route.query.task ? Number(route.query.task) :
 const filter = ref<"all" | "unrated" | "missing" | "present">("all")
 const selectedId = ref<string | null>(null)
 const presenting = ref(false)
+// 点开作品默认用大图（预览占满中间），老师也可以切回旁边的小面板；记住选择
+const bigPreview = useStorage("review-big-preview", true)
+const fullDetail = computed(() => !!selectedId.value && bigPreview.value)
 const presentIndex = ref(0)
 
-const classOptions = computed(() => options.value.classes.map((c) => ({ label: `${c} 班`, value: c })))
+// 全部班级：一道题全校的作品放在一面墙上，按班级分组
+const ALL = "__all__"
+const classOptions = computed(() => [
+  { label: "全部班级", value: ALL },
+  ...options.value.classes.map((c) => ({ label: `${c} 班`, value: c })),
+])
+const classParam = () => (classname.value === ALL ? undefined : classname.value ?? undefined)
 const task = computed(() => options.value.tasks.find((t) => t.id === taskId.value))
 const taskGroups = computed(() => [
   { label: "教程", items: options.value.tasks.filter((t) => t.task_type === "tutorial") },
@@ -171,6 +191,22 @@ const visible = computed(() =>
     return true
   }),
 )
+const groups = computed(() => {
+  if (classname.value !== ALL) {
+    return [{ name: "", items: visible.value, submitted: 0, total: 0, collapsed: false }]
+  }
+  const map = new Map<string, ReviewStudent[]>()
+  for (const s of visible.value) {
+    if (!map.has(s.classname)) map.set(s.classname, [])
+    map.get(s.classname)!.push(s)
+  }
+  return [...map].map(([name, items]) => {
+    const all = students.value.filter((s) => s.classname === name)
+    const submitted = all.filter((s) => s.submission).length
+    // 全校一起看时，没人交的班（这道题没布置给它）只留一行标题，不然一屏都是“未交”
+    return { name, items, submitted, total: all.length, collapsed: !submitted && filter.value !== "missing" }
+  })
+})
 const presentList = computed(() => students.value.filter((s) => s.submission?.flag === "present"))
 
 const docs = new Map<string, string>()
@@ -197,7 +233,7 @@ async function loadWall() {
   const s = ++wallSeq
   loadingWall.value = true
   try {
-    const data = await Review.classWall(classname.value, taskId.value)
+    const data = await Review.classWall(classParam(), taskId.value)
     if (s === wallSeq) students.value = data
   } finally {
     if (s === wallSeq) loadingWall.value = false
@@ -206,7 +242,7 @@ async function loadWall() {
 
 async function loadProgress() {
   progress.value = null
-  if (classname.value) progress.value = await Review.progress(classname.value)
+  if (classname.value) progress.value = await Review.progress(classParam())
 }
 
 watch(classname, (c) => {
@@ -254,7 +290,8 @@ function onKey(e: KeyboardEvent) {
   }
   const t = e.target as HTMLElement
   if (t.closest("input, textarea, [contenteditable]") || e.ctrlKey || e.metaKey || e.altKey) return
-  if (e.key === "j" || e.key === "J") move(1)
+  if (e.key === "Escape" && selectedId.value) selectedId.value = null
+  else if (e.key === "j" || e.key === "J") move(1)
   else if (e.key === "k" || e.key === "K") move(-1)
 }
 
@@ -263,7 +300,8 @@ onMounted(async () => {
   options.value = await Review.options()
   if (!classname.value) {
     const saved = localStorage.getItem("review-class")
-    classname.value = saved && options.value.classes.includes(saved) ? saved : null
+    classname.value =
+      saved && (saved === ALL || options.value.classes.includes(saved)) ? saved : null
   } else {
     loadProgress()
     loadWall()
@@ -401,6 +439,18 @@ onUnmounted(() => window.removeEventListener("keydown", onKey))
   overflow-y: auto;
 }
 
+.group-head {
+  display: flex;
+  align-items: baseline;
+  gap: 10px;
+  padding: 14px 14px 0;
+}
+
+.group-head span {
+  font-size: 12px;
+  color: var(--wp-muted);
+}
+
 .grid {
   display: grid;
   grid-template-columns: repeat(auto-fill, minmax(168px, 1fr));
@@ -522,6 +572,12 @@ onUnmounted(() => window.removeEventListener("keydown", onKey))
   min-height: 0;
 }
 
+.detail.full {
+  flex: 1;
+  width: auto;
+  border-left: 0;
+}
+
 .present-mode {
   position: fixed;
   inset: 0;
diff --git a/client/src/utils/type.ts b/client/src/utils/type.ts
index b270973..7c58f02 100644
--- a/client/src/utils/type.ts
+++ b/client/src/utils/type.ts
@@ -410,6 +410,7 @@ export interface ReviewSubmission {
 export interface ReviewStudent {
   user_id: number
   username: string
+  classname: string
   submission: ReviewSubmission | null
 }
 
@@ -417,6 +418,7 @@ export interface PeerWork {
   id: string
   // 自己打分之前是 null
   username: string | null
+  classname: string
   score: number | null
   my_score: number
   created: string
diff --git a/server/src/routes/review.ts b/server/src/routes/review.ts
index 308cdcc..1a9b10c 100644
--- a/server/src/routes/review.ts
+++ b/server/src/routes/review.ts
@@ -14,6 +14,15 @@ function requireStaff(user: User) {
 // 和成绩册一致：班里的学生包括当助教的 admin
 const CLASS_MEMBERS = `SELECT id FROM account_user
   WHERE classname = $classname AND role IN ('normal', 'admin') AND is_active = 1`
+// 不传班级时：所有有班级的学生
+const ALL_MEMBERS = `SELECT id FROM account_user
+  WHERE classname != '' AND role IN ('normal', 'admin') AND is_active = 1`
+
+function members(classname: string | undefined) {
+  return classname
+    ? { sql: CLASS_MEMBERS, params: { classname } as Record<string, unknown> }
+    : { sql: ALL_MEMBERS, params: {} as Record<string, unknown> }
+}
 
 // 每个人在这个任务上最新的一次提交，以及提交了几次。
 // 先只在 slim 覆盖索引上找，再按 rowid 读这几行的完整内容（代码是宽列，见 CLAUDE.md）
@@ -64,17 +73,16 @@ router.get("/options", (c) => {
 })
 
 // 一个班每个任务交了几个人
+// 不传 classname 就是全部班级
 router.get("/progress", (c) => {
   requireStaff(requireUser(c))
-  const { classname } = query(c, z.object({ classname: z.string().min(1) }))
-  const studentCount = get<{ n: number }>(
-    `SELECT COUNT(*) AS n FROM (${CLASS_MEMBERS})`,
-    { classname },
-  )!.n
+  const { classname } = query(c, z.object({ classname: z.string().min(1).optional() }))
+  const m = members(classname)
+  const studentCount = get<{ n: number }>(`SELECT COUNT(*) AS n FROM (${m.sql})`, m.params)!.n
   const rows = all<{ task_id: number; n: number }>(
     `SELECT s.task_id, COUNT(DISTINCT s.user_id) AS n FROM submission_submission s
-     WHERE s.user_id IN (${CLASS_MEMBERS}) GROUP BY s.task_id`,
-    { classname },
+     WHERE s.user_id IN (${m.sql}) GROUP BY s.task_id`,
+    m.params,
   )
   return c.json({
     student_count: studentCount,
@@ -86,15 +94,18 @@ router.get("/progress", (c) => {
 router.get("/class", (c) => {
   const user = requireUser(c)
   requireStaff(user)
-  const q = query(c, z.object({ classname: z.string().min(1), task_id: z.coerce.number().int() }))
-  orNotFound(get(`SELECT 1 FROM task_task WHERE id = $id`, { id: q.task_id }), "任务不存在")
-  const students = all<{ id: number; username: string }>(
-    `SELECT id, username FROM account_user
-     WHERE classname = $classname AND role IN ('normal', 'admin') AND is_active = 1
-     ORDER BY username, id`,
-    { classname: q.classname },
+  const q = query(
+    c,
+    z.object({ classname: z.string().min(1).optional(), task_id: z.coerce.number().int() }),
   )
-  const latest = latestByUser(q.task_id, CLASS_MEMBERS, { classname: q.classname })
+  orNotFound(get(`SELECT 1 FROM task_task WHERE id = $id`, { id: q.task_id }), "任务不存在")
+  const m = members(q.classname)
+  const students = all<{ id: number; username: string; classname: string }>(
+    `SELECT id, username, classname FROM account_user WHERE id IN (${m.sql})
+     ORDER BY classname, username, id`,
+    m.params,
+  )
+  const latest = latestByUser(q.task_id, m.sql, m.params)
   const rows = loadRows([...latest.values()].map((l) => l.rid), user.id)
   return c.json(
     students.map((s) => {
@@ -102,6 +113,7 @@ router.get("/class", (c) => {
       return {
         user_id: s.id,
         username: s.username,
+        classname: s.classname,
         submission: r
           ? {
               id: uuidOut(r.id),
@@ -122,33 +134,41 @@ router.get("/class", (c) => {
   )
 })
 
-// 学生看本班同学在这道题上的作品：自己交过才开放；自己打分之前不显示作者和得分
+// 学生看同学在这道题上的作品：自己交过才开放；自己打分之前不显示作者和得分。
+// scope=class 只看本班（默认，一个班几十份），scope=all 看全校所有班
 router.get("/peers/:task_id", (c) => {
   const user = requireUser(c)
   const taskId = intParam(c, "task_id")
+  const { scope } = query(c, z.object({ scope: z.enum(["class", "all"]).default("class") }))
   orNotFound(get(`SELECT 1 FROM task_task WHERE id = $id`, { id: taskId }), "任务不存在")
   const submitted = get(
     `SELECT 1 FROM submission_submission WHERE user_id = $me AND task_id = $task_id LIMIT 1`,
     { me: user.id, task_id: taskId },
   )
-  if (!submitted || !user.classname) return c.json({ locked: true, items: [] })
+  if (!submitted) return c.json({ locked: true, items: [] })
+  const byClass = scope === "class" && !!user.classname
   const members = `SELECT id FROM account_user
-    WHERE classname = $classname AND role = 'normal' AND is_active = 1 AND id != $me`
-  const params = { classname: user.classname, me: user.id }
+    WHERE role = 'normal' AND is_active = 1 AND id != $me
+      ${byClass ? "AND classname = $classname" : ""}`
+  const params = byClass ? { classname: user.classname, me: user.id } : { me: user.id }
   const latest = latestByUser(taskId, members, params)
   const rows = loadRows([...latest.values()].map((l) => l.rid), user.id)
-  const names = new Map(
-    all<{ id: number; username: string }>(`SELECT id, username FROM account_user WHERE id IN (${members})`, params).map(
-      (u) => [u.id, u.username],
-    ),
+  const people = new Map(
+    all<{ id: number; username: string; classname: string }>(
+      `SELECT id, username, classname FROM account_user WHERE id IN (${members})`,
+      params,
+    ).map((u) => [u.id, u]),
   )
   const items = [...rows.values()]
     .sort((a, b) => (a.created < b.created ? 1 : -1))
     .map((r) => {
       const rated = (r.my_score || 0) > 0
+      const p = people.get(r.user_id)
       return {
         id: uuidOut(r.id),
-        username: rated ? names.get(r.user_id) : null,
+        username: rated ? p?.username : null,
+        // 班级不算身份信息，打分前也显示
+        classname: p?.classname ?? "",
         score: rated ? r.score : null,
         my_score: r.my_score || 0,
         created: iso(r.created),
diff --git a/server/src/routes/submission.ts b/server/src/routes/submission.ts
index f453225..243207c 100644
--- a/server/src/routes/submission.ts
+++ b/server/src/routes/submission.ts
@@ -37,16 +37,13 @@ const router = new Hono<Env>()
 router.route("/showcase", showcase)
 router.route("/review", review)
 
-// 学生能看的提交：自己的、进了作品展的、本班同学在自己也交过的题上的。老师都能看
+// 学生能看的提交：自己的、进了作品展的、自己也交过的那道题上同学（任何班）的。老师都能看
 function canView(user: User, sub: { id: string; user_id: number; task_id: number }) {
   if (isStaff(user) || sub.user_id === user.id) return true
   if (get(`SELECT 1 FROM submission_submissionaward WHERE submission_id = $id`, { id: sub.id })) return true
-  if (!user.classname) return false
   return !!get(
-    `SELECT 1 FROM account_user u
-     WHERE u.id = $owner AND u.classname = $classname
-       AND EXISTS (SELECT 1 FROM submission_submission s WHERE s.user_id = $me AND s.task_id = $task_id)`,
-    { owner: sub.user_id, classname: user.classname, me: user.id, task_id: sub.task_id },
+    `SELECT 1 FROM submission_submission s WHERE s.user_id = $me AND s.task_id = $task_id LIMIT 1`,
+    { me: user.id, task_id: sub.task_id },
   )
 }
 
diff --git a/server/tests/api.test.ts b/server/tests/api.test.ts
index 92d387d..cf95e43 100644
--- a/server/tests/api.test.ts
+++ b/server/tests/api.test.ts
@@ -495,7 +495,7 @@ describe("任务素材", () => {
 })
 
 describe("同学作品与批改", () => {
-  test("学生只能看自己的、作品展里的、本班同学在自己也交过的题上的提交", async () => {
+  test("学生只能看自己的、作品展里的、自己也交过的题上同学（任何班）的提交", async () => {
     const me = makeUser("me", "normal", "c1")
     const mate = makeUser("mate", "normal", "c1")
     const other = makeUser("other", "normal", "c2")
@@ -509,10 +509,15 @@ describe("同学作品与批改", () => {
     const locked = await stu("GET", `/api/submission/review/peers/${task}`)
     expect(locked.json).toEqual({ locked: true, items: [] })
 
+    expect((await stu("GET", `/api/submission/${uuid(otherSub)}`)).status).toBe(403)
     makeSubmission(me, task)
     expect((await stu("GET", `/api/submission/${uuid(mateSub)}`)).status).toBe(200)
-    // 外班的仍然看不到
-    expect((await stu("GET", `/api/submission/${uuid(otherSub)}`)).status).toBe(403)
+    // 交过以后外班的也能看
+    expect((await stu("GET", `/api/submission/${uuid(otherSub)}`)).status).toBe(200)
+    // 没交过的题仍然看不到
+    const otherTask = makeTask("T2", "challenge", 2)
+    const otherTaskSub = makeSubmission(mate, otherTask)
+    expect((await stu("GET", `/api/submission/${uuid(otherTaskSub)}`)).status).toBe(403)
     // 列表里只有自己的
     const list = await stu("GET", "/api/submission/")
     expect(list.json.items.map((s: any) => s.username)).toEqual(["me"])
@@ -539,6 +544,14 @@ describe("同学作品与批改", () => {
 
     const random = await (await client("other"))("GET", "/api/submission/random-for-rating")
     expect(random.json.username).toBeUndefined()
+
+    // 默认只看本班；scope=all 能看到外班，标着班级，同样匿名
+    const otherSub = makeSubmission(get(`SELECT id FROM account_user WHERE username = 'other'`).id, task)
+    const all = await stu("GET", `/api/submission/review/peers/${task}?scope=all`)
+    expect(all.json.items.map((w: any) => [w.classname, w.username])).toContainEqual(["c2", null])
+    expect(all.json.items.map((w: any) => w.id)).toContain(uuid(otherSub))
+    const mine = await stu("GET", `/api/submission/review/peers/${task}`)
+    expect(mine.json.items.map((w: any) => w.classname)).toEqual(["c1"])
   })
 
   test("老师按班级 × 任务看作品墙；课上展示用 flag", async () => {
@@ -558,8 +571,20 @@ describe("同学作品与批改", () => {
     ])
     const progress = await teacher("GET", "/api/submission/review/progress?classname=c1")
     expect(progress.json).toEqual({ student_count: 2, submitted: { [task]: 1 } })
+
+    // 不传班级：所有班的学生都在，带着班级
+    const other = makeUser("z", "normal", "c2")
+    makeSubmission(other, task)
+    const allWall = await teacher("GET", `/api/submission/review/class?task_id=${task}`)
+    expect(allWall.json.map((s: any) => [s.classname, s.username])).toEqual([
+      ["c1", "a"],
+      ["c1", "b"],
+      ["c2", "z"],
+    ])
+    const allProgress = await teacher("GET", "/api/submission/review/progress")
+    expect(allProgress.json).toEqual({ student_count: 3, submitted: { [task]: 2 } })
     const options = await teacher("GET", "/api/submission/review/options")
-    expect(options.json.classes).toEqual(["c1"])
+    expect(options.json.classes).toEqual(["c1", "c2"])
 
     expect((await teacher("PUT", `/api/submission/${uuid(latest)}/flag`, { flag: "present" })).json.flag).toBe("present")
   })