diff --git a/src/components/SelectLanguage.vue b/src/components/SelectLanguage.vue
index 0734e49..15a353b 100644
--- a/src/components/SelectLanguage.vue
+++ b/src/components/SelectLanguage.vue
@@ -1,30 +1,46 @@
 <script lang="ts" setup>
 import type { SelectOption } from "naive-ui"
-import { h } from "vue"
+import { h, computed, watch } from "vue"
 import { code } from "../composables/code"
+import { isMobile } from "../composables/breakpoints"
 
-const LANGS = [
-  ["python", "Python"],
-  ["turtle", "海龟绘图"],
-  ["c", "C 语言"],
-  ["cpp", "C++"],
-]
+const LANGS = computed(() => {
+  const allLangs = [
+    ["python", "Python"],
+    ["turtle", "海龟绘图"],
+    ["c", "C 语言"],
+    ["cpp", "C++"],
+  ]
+  if (isMobile.value) {
+    return allLangs.filter(([lang]) => lang !== "turtle")
+  }
+  return allLangs
+})
 
-const languages: SelectOption[] = LANGS.map((it) => ({
-  value: it[0],
-  label: () => [
-    h("img", {
-      src: `/${it[0]}.svg`,
-      style: {
-        width: "16px",
-        height: "16px",
-        marginRight: "8px",
-        transform: "translateY(3px)",
-      },
-    }),
-    it[1],
-  ],
-}))
+// 如果当前在移动端且语言是海龟绘图，自动切换到 Python
+watch(isMobile, (mobile) => {
+  if (mobile && code.language === "turtle") {
+    code.language = "python"
+  }
+})
+
+const languages = computed<SelectOption[]>(() =>
+  LANGS.value.map((it) => ({
+    value: it[0],
+    label: () => [
+      h("img", {
+        src: `/${it[0]}.svg`,
+        style: {
+          width: "16px",
+          height: "16px",
+          marginRight: "8px",
+          transform: "translateY(3px)",
+        },
+      }),
+      it[1],
+    ],
+  })),
+)
 </script>
 <template>
   <n-select