diff --git a/frontend/src/components/user/ProfilePage.tsx b/frontend/src/components/user/ProfilePage.tsx
index 125c7dc..ab1c95e 100644
--- a/frontend/src/components/user/ProfilePage.tsx
+++ b/frontend/src/components/user/ProfilePage.tsx
@@ -55,11 +55,19 @@ export default function ProfilePage() {
   const username = profile?.username || storeUser?.username || '';
 
   const handleChangePassword = async () => {
-    if (!oldPwd || newPwd.length < 6) return;
+    // 显式校验并给出提示，避免"点了没反应"。// Logan.Li
+    if (!oldPwd) {
+      toast({ title: '请先输入当前密码', variant: 'destructive' });
+      return;
+    }
+    if (newPwd.length < 6) {
+      toast({ title: '新密码至少 6 位', variant: 'destructive' });
+      return;
+    }
     setPwdSaving(true);
     try {
       await authApi.changePassword({ old_password: oldPwd, new_password: newPwd });
-      toast({ title: '密码已修改' });
+      toast({ title: '密码已修改', description: '下次登录请使用新密码' });
       setOldPwd('');
       setNewPwd('');
     } catch (e: unknown) {
@@ -121,7 +129,7 @@ export default function ProfilePage() {
               <Label className="text-xs text-[var(--dg-text-muted)]">新密码</Label>
               <Input type="password" value={newPwd} onChange={e => setNewPwd(e.target.value)} className="mt-1 h-9 bg-[var(--dg-bg-tertiary)] border-[var(--dg-border)]" />
             </div>
-            <Button size="sm" onClick={handleChangePassword} disabled={pwdSaving || !oldPwd || newPwd.length < 6}>
+            <Button size="sm" onClick={handleChangePassword} disabled={pwdSaving}>
               {pwdSaving ? <Loader2 className="h-4 w-4 animate-spin mr-1" /> : null}
               保存密码
             </Button>
diff --git a/frontend/src/hooks/use-toast.tsx b/frontend/src/hooks/use-toast.tsx
index 9b550e7..79cd854 100644
--- a/frontend/src/hooks/use-toast.tsx
+++ b/frontend/src/hooks/use-toast.tsx
@@ -1,33 +1,37 @@
-import { useState, useCallback } from 'react';
+// useToast — 统一委托到全局 sonner <Toaster />，确保提示真实可见。// Logan.Li
+//
+// 历史问题：早期版本把 toast 存在 hook 内的局部 state 并返回 toasts 数组，
+// 但没有任何页面渲染该数组（全局只挂载了 sonner 的 <Toaster />），
+// 导致所有 useToast() 调用产生的提示都是隐形的（表现为"保存没反应"）。
+// 现统一转发到 sonner，保持返回值结构兼容既有调用方。// Logan.Li
 
-interface Toast {
-  id: string;
+import { useCallback } from 'react';
+import { toast as sonnerToast } from 'sonner';
+
+export interface ToastOptions {
   title: string;
   description?: string;
   variant?: 'default' | 'destructive';
 }
 
 interface UseToastReturn {
-  toast: (opts: { title: string; description?: string; variant?: 'default' | 'destructive' }) => void;
-  toasts: Toast[];
+  toast: (opts: ToastOptions) => void;
+  toasts: never[];
   dismiss: (id: string) => void;
 }
 
 export function useToast(): UseToastReturn {
-  const [toasts, setToasts] = useState<Toast[]>([]);
-
-  const toast = useCallback((opts: { title: string; description?: string; variant?: 'default' | 'destructive' }) => {
-    const id = Math.random().toString(36).slice(2);
-    const t: Toast = { id, ...opts };
-    setToasts((prev) => [...prev, t]);
-    setTimeout(() => {
-      setToasts((prev) => prev.filter((x) => x.id !== id));
-    }, 4000);
+  const toast = useCallback((opts: ToastOptions) => {
+    const { title, description, variant } = opts;
+    if (variant === 'destructive') {
+      sonnerToast.error(title, { description });
+    } else {
+      sonnerToast.success(title, { description });
+    }
   }, []);
 
-  const dismiss = useCallback((id: string) => {
-    setToasts((prev) => prev.filter((t) => t.id !== id));
-  }, []);
+  // sonner 自带 dismiss 能力，此处保留空实现以兼容既有解构。// Logan.Li
+  const dismiss = useCallback(() => {}, []);
 
-  return { toast, toasts, dismiss };
+  return { toast, toasts: [], dismiss };
 }