diff --git a/apps/im_app/lib/features/login/presentation/login_view_model.dart b/apps/im_app/lib/features/login/presentation/login_view_model.dart
index 89f1adb..7552100 100644
--- a/apps/im_app/lib/features/login/presentation/login_view_model.dart
+++ b/apps/im_app/lib/features/login/presentation/login_view_model.dart
@@ -59,6 +59,10 @@ class LoginViewModel extends _$LoginViewModel {
   /// 仅用于演示路由守卫行为，正式 UI 就绪后删除此方法，改用 [login]。
   /// 正式 [login] 成功后同样需要调用 [AuthNotifier.login] 更新守卫状态。
   Future<void> demoLogin() async {
+    // 防止连点重入：第一次调用未完成前忽略后续调用
+    if (state.isLoading) return;
+    state = state.copyWith(isLoading: true, error: null);
+
     try {
       final storageApi = ref.read(storageSdkProvider);
       final storageLifeCycle = storageApi as StorageSdkLifecycle;
@@ -72,11 +76,15 @@ class LoginViewModel extends _$LoginViewModel {
       // 先完成 DB 操作，再标记登录状态（失败时不会误标为已登录）
       await storageLifeCycle.openDatabase(user.uid);
       final userCompanion = UserDto.fromEntity(user).toCompanion();
-      await storageApi.insert(userCompanion);
+      await storageApi.insertOrReplace(userCompanion);
 
       // 全部成功后再更新登录状态，触发路由守卫重定向
+      // 注意：login() 触发导航后 provider 随即被 dispose，之后不能再写 state
+      if (!ref.mounted) return;
       ref.read(authNotifierProvider).login();
     } catch (e) {
+      // 导航已发生时 provider 已被 dispose，静默丢弃，不再写 state
+      if (!ref.mounted) return;
       state = state.copyWith(error: e.toString(), isLoading: false);
     }
   }
@@ -94,15 +102,19 @@ class LoginViewModel extends _$LoginViewModel {
           .read(loginUseCaseProvider)
           .execute(email: email, password: password);
 
+      if (!ref.mounted) return;
       state = state.copyWith(user: user, isLoading: false);
     } on FormatException catch (e) {
       // 格式校验失败（UseCase 层抛出）
+      if (!ref.mounted) return;
       state = state.copyWith(error: e.message, isLoading: false);
     } on ApiError catch (e) {
       // 网络 / 服务端错误（Repository → SDK 透传）
+      if (!ref.mounted) return;
       state = state.copyWith(error: e.displayMessage, isLoading: false);
     } catch (e) {
       // 兜底：防止未预期的异常导致 isLoading 死锁
+      if (!ref.mounted) return;
       state = state.copyWith(error: e.toString(), isLoading: false);
     }
   }
diff --git a/apps/im_app/lib/features/login/view/login_page.dart b/apps/im_app/lib/features/login/view/login_page.dart
index dcfe9ab..c907581 100644
--- a/apps/im_app/lib/features/login/view/login_page.dart
+++ b/apps/im_app/lib/features/login/view/login_page.dart
@@ -15,13 +15,12 @@ class LoginPage extends ConsumerWidget {
 
   @override
   Widget build(BuildContext context, WidgetRef ref) {
+    // ref.watch 保持 loginViewModelProvider 存活（AutoDispose 需要至少一个监听者）
+    final state = ref.watch(loginViewModelProvider);
     final s = context.styles;
 
     return Scaffold(
-      appBar: AppBar(
-        title: const Text('登录'),
-        automaticallyImplyLeading: false,
-      ),
+      appBar: AppBar(title: const Text('登录'), automaticallyImplyLeading: false),
       body: Center(
         child: Column(
           mainAxisSize: MainAxisSize.min,
@@ -34,7 +33,9 @@ class LoginPage extends ConsumerWidget {
             ),
             const SizedBox(height: 32),
             FilledButton(
-              onPressed: () => ref.read(loginViewModelProvider.notifier).demoLogin(),
+              onPressed: state.isLoading
+                  ? null
+                  : () => ref.read(loginViewModelProvider.notifier).demoLogin(),
               child: const Text('登录'),
             ),
           ],