diff --git a/client/src/lib/changelog.ts b/client/src/lib/changelog.ts
index 650bc29..3253175 100644
--- a/client/src/lib/changelog.ts
+++ b/client/src/lib/changelog.ts
@@ -8,6 +8,22 @@ export type ChangeLogEntry = {
 };
 
 export const CHANGE_LOG_ENTRIES: ChangeLogEntry[] = [
+  {
+    version: "2026.03.15-live-analysis-leave-hint",
+    releaseDate: "2026-03-15",
+    repoVersion: "pending-commit",
+    summary: "实时分析结束后增加离开提示，明确何时必须停留、何时可以安全关闭或切页。",
+    features: [
+      "分析进行中显示“不要关闭或切走页面”提示",
+      "结束分析后保存阶段显示“请暂时停留当前页面”提示",
+      "保存成功后明确提示“现在可以关闭浏览器或切换到其他页面”",
+      "分析中和保存中挂接 beforeunload 提醒，减少误关页面导致的数据丢失",
+    ],
+    tests: [
+      "pnpm check",
+      "pnpm build",
+    ],
+  },
   {
     version: "2026.03.15-training-generator-collapse",
     releaseDate: "2026-03-15",
diff --git a/client/src/pages/LiveCamera.tsx b/client/src/pages/LiveCamera.tsx
index 2b51bb7..dcb637f 100644
--- a/client/src/pages/LiveCamera.tsx
+++ b/client/src/pages/LiveCamera.tsx
@@ -1,5 +1,6 @@
 import { useAuth } from "@/_core/hooks/useAuth";
 import { trpc } from "@/lib/trpc";
+import { Alert, AlertDescription, AlertTitle } from "@/components/ui/alert";
 import { Badge } from "@/components/ui/badge";
 import { Button } from "@/components/ui/button";
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
@@ -572,6 +573,7 @@ export default function LiveCamera() {
   const [sessionMode, setSessionMode] = useState<SessionMode>("practice");
   const [analyzing, setAnalyzing] = useState(false);
   const [saving, setSaving] = useState(false);
+  const [leaveStatus, setLeaveStatus] = useState<"idle" | "analyzing" | "saving" | "safe" | "failed">("idle");
   const [immersivePreview, setImmersivePreview] = useState(false);
   const [liveScore, setLiveScore] = useState<PoseScore | null>(null);
   const [currentAction, setCurrentAction] = useState<ActionType>("unknown");
@@ -979,6 +981,7 @@ export default function LiveCamera() {
     analyzingRef.current = true;
     setAnalyzing(true);
     setSaving(false);
+    setLeaveStatus("analyzing");
     setSegments([]);
     segmentsRef.current = [];
     currentSegmentRef.current = null;
@@ -1049,6 +1052,7 @@ export default function LiveCamera() {
     } catch (error: any) {
       analyzingRef.current = false;
       setAnalyzing(false);
+      setLeaveStatus("idle");
       await stopSessionRecorder();
       toast.error(`实时分析启动失败: ${error?.message || "未知错误"}`);
     }
@@ -1059,6 +1063,7 @@ export default function LiveCamera() {
     analyzingRef.current = false;
     setAnalyzing(false);
     setSaving(true);
+    setLeaveStatus("saving");
 
     if (animationRef.current) {
       cancelAnimationFrame(animationRef.current);
@@ -1071,15 +1076,32 @@ export default function LiveCamera() {
         poseRef.current = null;
       }
       await persistSession();
+      setLeaveStatus("safe");
       toast.success("实时分析已保存，并同步写入训练记录");
       await liveSessionsQuery.refetch();
     } catch (error: any) {
+      setLeaveStatus("failed");
       toast.error(`保存实时分析失败: ${error?.message || "未知错误"}`);
     } finally {
       setSaving(false);
     }
   }, [liveSessionsQuery, persistSession]);
 
+  useEffect(() => {
+    if (!analyzing && !saving) {
+      return;
+    }
+
+    const handleBeforeUnload = (event: BeforeUnloadEvent) => {
+      event.preventDefault();
+      event.returnValue = "实时分析数据仍在处理中，请先等待保存完成。";
+      return event.returnValue;
+    };
+
+    window.addEventListener("beforeunload", handleBeforeUnload);
+    return () => window.removeEventListener("beforeunload", handleBeforeUnload);
+  }, [analyzing, saving]);
+
   const handleSetupComplete = useCallback(async () => {
     setShowSetupGuide(false);
     await startCamera(facing, zoomTargetRef.current, qualityPreset);
@@ -1217,6 +1239,46 @@ export default function LiveCamera() {
         </DialogContent>
       </Dialog>
 
+      {leaveStatus === "analyzing" ? (
+        <Alert>
+          <Activity className="h-4 w-4" />
+          <AlertTitle>分析进行中</AlertTitle>
+          <AlertDescription>
+            当前仍在采集和识别动作数据，请先不要关闭浏览器或切走页面。
+          </AlertDescription>
+        </Alert>
+      ) : null}
+
+      {leaveStatus === "saving" ? (
+        <Alert>
+          <Activity className="h-4 w-4" />
+          <AlertTitle>正在保存分析结果</AlertTitle>
+          <AlertDescription>
+            视频、动作区间和训练记录正在提交，请暂时停留当前页面；保存完成后会提示你可以离开。
+          </AlertDescription>
+        </Alert>
+      ) : null}
+
+      {leaveStatus === "safe" ? (
+        <Alert>
+          <CheckCircle2 className="h-4 w-4" />
+          <AlertTitle>分析结果已保存</AlertTitle>
+          <AlertDescription>
+            当前分析数据已经提交完成。现在可以关闭浏览器、返回上一页，或切换到其他页面，不会影响已保存的数据。
+          </AlertDescription>
+        </Alert>
+      ) : null}
+
+      {leaveStatus === "failed" ? (
+        <Alert>
+          <Activity className="h-4 w-4" />
+          <AlertTitle>分析保存失败</AlertTitle>
+          <AlertDescription>
+            当前会话还没有完整写入，请先留在本页并重新尝试结束分析或检查网络状态。
+          </AlertDescription>
+        </Alert>
+      ) : null}
+
       <section className="rounded-[28px] border border-border/60 bg-[radial-gradient(circle_at_top_left,_rgba(249,115,22,0.16),_transparent_32%),linear-gradient(135deg,rgba(12,18,24,0.98),rgba(26,31,43,0.96))] p-5 text-white shadow-xl shadow-black/10 md:p-7">
         <div className="flex flex-col gap-4 lg:flex-row lg:items-end lg:justify-between">
           <div className="space-y-3">
diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 3b52621..5430827 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -1,5 +1,23 @@
 # Tennis Training Hub - 变更日志
 
+## 2026.03.15-live-analysis-leave-hint (2026-03-15)
+
+### 功能更新
+
+- 实时分析进行中显示“不要关闭浏览器或切走页面”提示
+- 点击“结束分析”后，保存阶段显示“请暂时停留当前页面”提示
+- 保存完成后明确提示“现在可以关闭浏览器或切换到其他页面”
+- 分析中和保存中增加离开页面提醒，减少误关导致的数据丢失
+
+### 测试
+
+- `pnpm check`
+- `pnpm build`
+
+### 仓库版本
+
+- `pending-commit`
+
 ## 2026.03.15-training-generator-collapse (2026-03-15)
 
 ### 功能更新