diff --git a/backend/services/identity-service/src/api/controllers/user-account.controller.ts b/backend/services/identity-service/src/api/controllers/user-account.controller.ts
index c6db8f0c..d18e01ea 100644
--- a/backend/services/identity-service/src/api/controllers/user-account.controller.ts
+++ b/backend/services/identity-service/src/api/controllers/user-account.controller.ts
@@ -50,6 +50,7 @@ import {
   MarkMnemonicBackedUpCommand,
   VerifySmsCodeCommand,
   SetPasswordCommand,
+  ChangePasswordCommand,
 } from '@/application/commands';
 import {
   AutoCreateAccountDto,
@@ -80,6 +81,7 @@ import {
   WalletStatusGeneratingResponseDto,
   VerifySmsCodeDto,
   SetPasswordDto,
+  ChangePasswordDto,
   LoginWithPasswordDto,
   ResetPasswordDto,
 } from '@/api/dto';
@@ -295,6 +297,24 @@ export class UserAccountController {
     return { message: '密码设置成功' };
   }
 
+  @Post('change-password')
+  @ApiBearerAuth()
+  @ApiOperation({
+    summary: '修改登录密码',
+    description: '验证旧密码后修改为新密码',
+  })
+  @ApiResponse({ status: 200, description: '密码修改成功' })
+  @ApiResponse({ status: 400, description: '旧密码错误' })
+  async changePassword(
+    @CurrentUser() user: CurrentUserData,
+    @Body() dto: ChangePasswordDto,
+  ) {
+    await this.userService.changePassword(
+      new ChangePasswordCommand(user.userId, dto.oldPassword, dto.newPassword),
+    );
+    return { message: '密码修改成功' };
+  }
+
   @Get('my-profile')
   @ApiBearerAuth()
   @ApiOperation({ summary: '查询我的资料' })
diff --git a/backend/services/identity-service/src/api/dto/request/change-password.dto.ts b/backend/services/identity-service/src/api/dto/request/change-password.dto.ts
new file mode 100644
index 00000000..b9c03638
--- /dev/null
+++ b/backend/services/identity-service/src/api/dto/request/change-password.dto.ts
@@ -0,0 +1,23 @@
+import { IsString, MinLength, MaxLength, Matches } from 'class-validator';
+import { ApiProperty } from '@nestjs/swagger';
+
+export class ChangePasswordDto {
+  @ApiProperty({
+    example: 'OldPass123',
+    description: '当前密码',
+  })
+  @IsString()
+  oldPassword: string;
+
+  @ApiProperty({
+    example: 'NewPass456',
+    description: '新密码，6-20位，包含字母和数字',
+  })
+  @IsString()
+  @MinLength(6, { message: '密码长度至少6位' })
+  @MaxLength(20, { message: '密码长度不能超过20位' })
+  @Matches(/^(?=.*[A-Za-z])(?=.*\d).+$/, {
+    message: '密码需包含字母和数字',
+  })
+  newPassword: string;
+}
diff --git a/backend/services/identity-service/src/api/dto/request/index.ts b/backend/services/identity-service/src/api/dto/request/index.ts
index d7bc33e8..758a55d1 100644
--- a/backend/services/identity-service/src/api/dto/request/index.ts
+++ b/backend/services/identity-service/src/api/dto/request/index.ts
@@ -12,4 +12,5 @@ export * from './generate-backup-codes.dto';
 export * from './recover-by-backup-code.dto';
 export * from './verify-sms-code.dto';
 export * from './set-password.dto';
+export * from './change-password.dto';
 export * from './login-with-password.dto';
diff --git a/backend/services/identity-service/src/application/commands/index.ts b/backend/services/identity-service/src/application/commands/index.ts
index b312f303..3e176b36 100644
--- a/backend/services/identity-service/src/application/commands/index.ts
+++ b/backend/services/identity-service/src/application/commands/index.ts
@@ -183,6 +183,14 @@ export class SetPasswordCommand {
   ) {}
 }
 
+export class ChangePasswordCommand {
+  constructor(
+    public readonly userId: string,
+    public readonly oldPassword: string,
+    public readonly newPassword: string,
+  ) {}
+}
+
 // ============ Results ============
 
 // 钱包状态
diff --git a/backend/services/identity-service/src/application/services/user-application.service.ts b/backend/services/identity-service/src/application/services/user-application.service.ts
index fdc0a617..3d7fbffd 100644
--- a/backend/services/identity-service/src/application/services/user-application.service.ts
+++ b/backend/services/identity-service/src/application/services/user-application.service.ts
@@ -1984,6 +1984,60 @@ export class UserApplicationService {
     this.logger.log(`Password set successfully for user: ${command.userId}`);
   }
 
+  /**
+   * 修改登录密码
+   */
+  async changePassword(command: {
+    userId: string;
+    oldPassword: string;
+    newPassword: string;
+  }): Promise<void> {
+    this.logger.log(`Changing password for user: ${command.userId}`);
+
+    const userId = UserId.create(command.userId);
+    const user = await this.userRepository.findById(userId);
+
+    if (!user) {
+      throw new ApplicationError('用户不存在');
+    }
+
+    // 获取当前密码哈希
+    const account = await this.prisma.userAccount.findUnique({
+      where: { userId: BigInt(command.userId) },
+      select: { passwordHash: true },
+    });
+
+    if (!account?.passwordHash) {
+      throw new ApplicationError('尚未设置密码');
+    }
+
+    // 验证旧密码
+    const bcrypt = await import('bcrypt');
+    const isOldPasswordValid = await bcrypt.compare(
+      command.oldPassword,
+      account.passwordHash,
+    );
+
+    if (!isOldPasswordValid) {
+      this.logger.warn(
+        `Invalid old password for user: ${command.userId}`,
+      );
+      throw new ApplicationError('当前密码错误');
+    }
+
+    // 使用 bcrypt 哈希新密码
+    const saltRounds = 10;
+    const newPasswordHash = await bcrypt.hash(command.newPassword, saltRounds);
+
+    // 更新数据库
+    await this.prisma.userAccount.update({
+      where: { userId: BigInt(command.userId) },
+      data: { passwordHash: newPasswordHash },
+    });
+
+    this.logger.log(`Password changed successfully for user: ${command.userId}`);
+  }
+
   /**
    * 发送提取验证短信
    */
diff --git a/frontend/mobile-app/lib/app.dart b/frontend/mobile-app/lib/app.dart
index 55a6510e..7543ec62 100644
--- a/frontend/mobile-app/lib/app.dart
+++ b/frontend/mobile-app/lib/app.dart
@@ -1,14 +1,76 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:flutter_screenutil/flutter_screenutil.dart';
+import 'package:go_router/go_router.dart';
 import 'core/theme/app_theme.dart';
+import 'core/services/auth_event_service.dart';
+import 'core/services/multi_account_service.dart';
+import 'core/storage/secure_storage.dart';
 import 'routes/app_router.dart';
+import 'routes/route_paths.dart';
 
-class App extends ConsumerWidget {
+class App extends ConsumerStatefulWidget {
   const App({super.key});
 
   @override
-  Widget build(BuildContext context, WidgetRef ref) {
+  ConsumerState<App> createState() => _AppState();
+}
+
+class _AppState extends ConsumerState<App> {
+  StreamSubscription<AuthEvent>? _authEventSubscription;
+
+  @override
+  void initState() {
+    super.initState();
+    _listenToAuthEvents();
+  }
+
+  @override
+  void dispose() {
+    _authEventSubscription?.cancel();
+    super.dispose();
+  }
+
+  /// 监听认证事件
+  void _listenToAuthEvents() {
+    final authEventService = ref.read(authEventServiceProvider);
+    _authEventSubscription = authEventService.events.listen((event) {
+      if (event.type == AuthEventType.tokenExpired) {
+        _handleTokenExpired(event.message);
+      }
+    });
+  }
+
+  /// 处理 token 过期
+  Future<void> _handleTokenExpired(String? message) async {
+    debugPrint('[App] Token expired, navigating to login page');
+
+    // 清除当前账号状态（但保留账号列表和向导页标识）
+    final secureStorage = ref.read(secureStorageProvider);
+    final multiAccountService = MultiAccountService(secureStorage);
+    await multiAccountService.logoutCurrentAccount();
+
+    // 使用全局 Navigator Key 跳转到登录页面
+    final navigatorState = rootNavigatorKey.currentState;
+    if (navigatorState != null) {
+      // 显示提示消息
+      if (message != null) {
+        ScaffoldMessenger.of(navigatorState.context).showSnackBar(
+          SnackBar(
+            content: Text(message),
+            backgroundColor: Colors.orange,
+          ),
+        );
+      }
+      // 跳转到登录页面
+      navigatorState.context.go(RoutePaths.phoneLogin);
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
     final router = ref.watch(appRouterProvider);
 
     return ScreenUtilInit(
diff --git a/frontend/mobile-app/lib/core/network/api_client.dart b/frontend/mobile-app/lib/core/network/api_client.dart
index f39bb6d5..5eaef2e8 100644
--- a/frontend/mobile-app/lib/core/network/api_client.dart
+++ b/frontend/mobile-app/lib/core/network/api_client.dart
@@ -4,6 +4,7 @@ import '../storage/secure_storage.dart';
 import '../storage/storage_keys.dart';
 import '../errors/exceptions.dart';
 import '../config/app_config.dart';
+import '../services/auth_event_service.dart';
 
 /// API 客户端
 ///
@@ -106,19 +107,28 @@ class ApiClient {
           final response = await _retryRequest(error.requestOptions);
           return handler.resolve(response);
         } else {
-          // refresh token 不存在，不清除数据，让用户重新登录
+          // refresh token 不存在，需要重新登录
           debugPrint('Token refresh failed: no refresh token available');
+          _notifyTokenExpired();
         }
       } catch (e) {
         debugPrint('Token refresh exception: $e');
-        // 只有当 refresh token 明确过期（401）时才清除数据
-        // 其他错误（如网络错误）不清除，避免误清除
+        // refresh token 刷新失败（可能过期），需要重新登录
+        if (e is DioException && e.response?.statusCode == 401) {
+          debugPrint('Refresh token expired, notifying token expired event');
+          _notifyTokenExpired();
+        }
       }
     }
 
     handler.next(error);
   }
 
+  /// 通知 token 过期事件
+  void _notifyTokenExpired() {
+    AuthEventService().emitTokenExpired(message: '登录已过期，请重新登录');
+  }
+
   /// 尝试刷新 Token
   Future<bool> _tryRefreshToken() async {
     final refreshToken = await _secureStorage.read(key: StorageKeys.refreshToken);
diff --git a/frontend/mobile-app/lib/core/services/account_service.dart b/frontend/mobile-app/lib/core/services/account_service.dart
index 2ea4243f..42c83f06 100644
--- a/frontend/mobile-app/lib/core/services/account_service.dart
+++ b/frontend/mobile-app/lib/core/services/account_service.dart
@@ -1941,6 +1941,38 @@ class AccountService {
     debugPrint('$_tag isPasswordSet() - 结果: $result');
     return result;
   }
+
+  /// 修改登录密码
+  ///
+  /// [oldPassword] - 当前密码
+  /// [newPassword] - 新密码（6-20位，包含字母和数字）
+  Future<void> changePassword({
+    required String oldPassword,
+    required String newPassword,
+  }) async {
+    debugPrint('$_tag changePassword() - 开始修改登录密码');
+
+    try {
+      debugPrint('$_tag changePassword() - 调用 POST /user/change-password');
+      final response = await _apiClient.post(
+        '/user/change-password',
+        data: {
+          'oldPassword': oldPassword,
+          'newPassword': newPassword,
+        },
+      );
+      debugPrint('$_tag changePassword() - API 响应状态码: ${response.statusCode}');
+
+      debugPrint('$_tag changePassword() - 登录密码修改完成');
+    } on ApiException catch (e) {
+      debugPrint('$_tag changePassword() - API 异常: $e');
+      rethrow;
+    } catch (e, stackTrace) {
+      debugPrint('$_tag changePassword() - 未知异常: $e');
+      debugPrint('$_tag changePassword() - 堆栈: $stackTrace');
+      throw ApiException('修改密码失败: $e');
+    }
+  }
 }
 
 /// 遮蔽手机号中间部分，用于日志输出
diff --git a/frontend/mobile-app/lib/core/services/auth_event_service.dart b/frontend/mobile-app/lib/core/services/auth_event_service.dart
new file mode 100644
index 00000000..24ac8771
--- /dev/null
+++ b/frontend/mobile-app/lib/core/services/auth_event_service.dart
@@ -0,0 +1,61 @@
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+/// 认证事件类型
+enum AuthEventType {
+  /// Token 过期，需要重新登录
+  tokenExpired,
+}
+
+/// 认证事件
+class AuthEvent {
+  final AuthEventType type;
+  final String? message;
+
+  AuthEvent({
+    required this.type,
+    this.message,
+  });
+}
+
+/// 认证事件服务
+///
+/// 用于在 token 过期等情况下通知 UI 层进行页面跳转
+class AuthEventService {
+  /// 单例实例
+  static final AuthEventService _instance = AuthEventService._internal();
+
+  factory AuthEventService() => _instance;
+
+  AuthEventService._internal();
+
+  /// 事件流控制器
+  final _eventController = StreamController<AuthEvent>.broadcast();
+
+  /// 获取事件流
+  Stream<AuthEvent> get events => _eventController.stream;
+
+  /// 全局 Navigator Key（由 AppRouter 设置）
+  GlobalKey<NavigatorState>? navigatorKey;
+
+  /// 发送 token 过期事件
+  void emitTokenExpired({String? message}) {
+    debugPrint('[AuthEventService] Emitting token expired event');
+    _eventController.add(AuthEvent(
+      type: AuthEventType.tokenExpired,
+      message: message ?? '登录已过期，请重新登录',
+    ));
+  }
+
+  /// 释放资源
+  void dispose() {
+    _eventController.close();
+  }
+}
+
+/// 认证事件服务 Provider
+final authEventServiceProvider = Provider<AuthEventService>((ref) {
+  return AuthEventService();
+});
diff --git a/frontend/mobile-app/lib/core/services/multi_account_service.dart b/frontend/mobile-app/lib/core/services/multi_account_service.dart
index ed168469..9425d27a 100644
--- a/frontend/mobile-app/lib/core/services/multi_account_service.dart
+++ b/frontend/mobile-app/lib/core/services/multi_account_service.dart
@@ -264,6 +264,8 @@ class MultiAccountService {
       StorageKeys.referralCode,
       StorageKeys.inviterSequence,
       StorageKeys.isAccountCreated,
+      StorageKeys.phoneNumber,
+      StorageKeys.isPasswordSet,
       // 钱包信息
       StorageKeys.walletAddressBsc,
       StorageKeys.walletAddressKava,
@@ -308,6 +310,8 @@ class MultiAccountService {
       StorageKeys.referralCode,
       StorageKeys.inviterSequence,
       StorageKeys.isAccountCreated,
+      StorageKeys.phoneNumber,
+      StorageKeys.isPasswordSet,
       StorageKeys.walletAddressBsc,
       StorageKeys.walletAddressKava,
       StorageKeys.walletAddressDst,
diff --git a/frontend/mobile-app/lib/features/auth/presentation/pages/splash_page.dart b/frontend/mobile-app/lib/features/auth/presentation/pages/splash_page.dart
index 0b415827..c699513a 100644
--- a/frontend/mobile-app/lib/features/auth/presentation/pages/splash_page.dart
+++ b/frontend/mobile-app/lib/features/auth/presentation/pages/splash_page.dart
@@ -132,20 +132,20 @@ class _SplashPageState extends ConsumerState<SplashPage> {
     // 根据认证状态决定跳转目标
     // 优先级：
     // 1. 账号已创建 → 主页面（龙虎榜）
-    // 2. 首次打开或未看过向导 → 向导页
-    // 3. 其他情况 → 主页面（龙虎榜）
+    // 2. 首次打开 → 向导页
+    // 3. 已看过向导但账号未创建（退出登录后） → 登录页面
     if (authState.isAccountCreated) {
       // 账号已创建，进入主页面（龙虎榜）
       debugPrint('[SplashPage] 账号已创建 → 跳转到龙虎榜');
       context.go(RoutePaths.ranking);
-    } else if (authState.isFirstLaunch || !authState.hasSeenGuide) {
-      // 首次打开或未看过向导，进入向导页
-      debugPrint('[SplashPage] 首次打开或未看过向导 → 跳转到向导页');
+    } else if (authState.isFirstLaunch) {
+      // 首次打开，进入向导页
+      debugPrint('[SplashPage] 首次打开 → 跳转到向导页');
       context.go(RoutePaths.guide);
     } else {
-      // 其他情况，直接进入主页面（龙虎榜）
-      debugPrint('[SplashPage] 其他情况 → 跳转到龙虎榜');
-      context.go(RoutePaths.ranking);
+      // 已看过向导但账号未创建（退出登录后），跳转到登录页面
+      debugPrint('[SplashPage] 已看过向导，账号未创建 → 跳转到登录页面');
+      context.go(RoutePaths.phoneLogin);
     }
   }
 
diff --git a/frontend/mobile-app/lib/features/security/presentation/pages/change_password_page.dart b/frontend/mobile-app/lib/features/security/presentation/pages/change_password_page.dart
index b0ae0e27..01c15f65 100644
--- a/frontend/mobile-app/lib/features/security/presentation/pages/change_password_page.dart
+++ b/frontend/mobile-app/lib/features/security/presentation/pages/change_password_page.dart
@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
+import '../../../../core/di/injection_container.dart';
 
 /// 修改密码页面
 /// 支持设置或修改登录密码
@@ -60,22 +61,20 @@ class _ChangePasswordPageState extends ConsumerState<ChangePasswordPage> {
     });
 
     try {
-      // TODO: 调用API获取密码状态
-      // final accountService = ref.read(accountServiceProvider);
-      // final hasPassword = await accountService.hasPassword();
-
-      // 模拟数据
-      await Future.delayed(const Duration(milliseconds: 500));
+      final accountService = ref.read(accountServiceProvider);
+      final hasPassword = await accountService.isPasswordSet();
 
       if (mounted) {
         setState(() {
-          _hasPassword = false; // 模拟未设置密码
+          _hasPassword = hasPassword;
           _isLoading = false;
         });
       }
     } catch (e) {
       if (mounted) {
         setState(() {
+          // 出错时默认已设置密码（注册时必须设置）
+          _hasPassword = true;
           _isLoading = false;
         });
       }
@@ -144,15 +143,18 @@ class _ChangePasswordPageState extends ConsumerState<ChangePasswordPage> {
     });
 
     try {
-      // TODO: 调用API修改密码
-      // final accountService = ref.read(accountServiceProvider);
-      // await accountService.changePassword(
-      //   oldPassword: _hasPassword ? oldPassword : null,
-      //   newPassword: newPassword,
-      // );
+      final accountService = ref.read(accountServiceProvider);
 
-      // 模拟请求
-      await Future.delayed(const Duration(seconds: 1));
+      if (_hasPassword) {
+        // 已有密码，调用修改密码 API
+        await accountService.changePassword(
+          oldPassword: oldPassword,
+          newPassword: newPassword,
+        );
+      } else {
+        // 未设置过密码，调用设置密码 API
+        await accountService.setLoginPassword(newPassword);
+      }
 
       if (mounted) {
         setState(() {
@@ -174,7 +176,7 @@ class _ChangePasswordPageState extends ConsumerState<ChangePasswordPage> {
           _isSubmitting = false;
         });
 
-        _showErrorSnackBar('操作失败: ${e.toString()}');
+        _showErrorSnackBar('操作失败: ${e.toString().replaceAll('Exception: ', '')}');
       }
     }
   }
diff --git a/frontend/mobile-app/lib/routes/app_router.dart b/frontend/mobile-app/lib/routes/app_router.dart
index 15673094..945743b6 100644
--- a/frontend/mobile-app/lib/routes/app_router.dart
+++ b/frontend/mobile-app/lib/routes/app_router.dart
@@ -36,7 +36,8 @@ import '../features/account/presentation/pages/account_switch_page.dart';
 import 'route_paths.dart';
 import 'route_names.dart';
 
-final _rootNavigatorKey = GlobalKey<NavigatorState>();
+/// 全局根导航 Key，用于在非 Widget 上下文中进行导航
+final rootNavigatorKey = GlobalKey<NavigatorState>();
 final _shellNavigatorKey = GlobalKey<NavigatorState>();
 
 /// 备份助记词页面参数 (新版 - 只需要用户序列号)
@@ -99,7 +100,7 @@ class SharePageParams {
 
 final appRouterProvider = Provider<GoRouter>((ref) {
   return GoRouter(
-    navigatorKey: _rootNavigatorKey,
+    navigatorKey: rootNavigatorKey,
     initialLocation: RoutePaths.splash,
     debugLogDiagnostics: true,
     routes: [