diff --git a/frontend/asset_assistant/lib/main.dart b/frontend/asset_assistant/lib/main.dart
index 3882381..b339250 100644
--- a/frontend/asset_assistant/lib/main.dart
+++ b/frontend/asset_assistant/lib/main.dart
@@ -1,101 +1,82 @@
+import 'package:asset_assistant/pages/home_page.dart';
 import 'package:asset_assistant/pages/login_page.dart';
 import 'package:flutter/material.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 
-void main() {
-  runApp(const MyApp());
+void main() async {
+  WidgetsFlutterBinding.ensureInitialized();
+  final prefs = await SharedPreferences.getInstance();
+  final userId = prefs.getString('user_id');
+  debugPrint('初始化路由，用户ID: $userId');
+  runApp(MyApp(initialRoute: userId != null ? '/home' : '/login'));
 }
 
 class MyApp extends StatelessWidget {
-  const MyApp({super.key});
+  final String initialRoute;
+  const MyApp({super.key, required this.initialRoute});
 
   @override
   Widget build(BuildContext context) {
-    // 金融风格暗夜主题
-    final darkTheme = ThemeData(
-      brightness: Brightness.dark,
-      primaryColor: const Color(0xFF0F3460), // 主色调：深蓝色
-      colorScheme: ColorScheme.dark(
-        primary: const Color(0xFF0F3460),
-        secondary: const Color(0xFFD4AF37),
-        surface: const Color(0xFF121212), // 页面主背景
-        surfaceContainerHighest: const Color(0xFF1E1E1E), // 卡片背景（分层色）
-        onPrimary: Colors.white,
-        onSecondary: Colors.black,
-        onSurface: Colors.white70, // 所有表面的默认文本色
-      ),
-      // 文本样式（继承 onSurface 颜色，增强可读性）
-      textTheme: TextTheme(
-        bodyLarge: TextStyle(color: Colors.white70, fontSize: 16, height: 1.5),
-        bodyMedium: TextStyle(color: Colors.white60, fontSize: 14, height: 1.5),
-        headlineLarge: TextStyle(
-          color: Colors.white,
-          fontSize: 24,
-          fontWeight: FontWeight.w600,
-        ),
-        headlineMedium: TextStyle(
-          color: Colors.white,
-          fontSize: 20,
-          fontWeight: FontWeight.w600,
-        ),
-      ),
-      // 输入框样式
-      inputDecorationTheme: InputDecorationTheme(
-        border: OutlineInputBorder(
-          borderSide: const BorderSide(color: Color(0xFF333333)),
-          borderRadius: BorderRadius.circular(8),
-        ),
-        enabledBorder: OutlineInputBorder(
-          borderSide: const BorderSide(color: Color(0xFF333333)),
-          borderRadius: BorderRadius.circular(8),
-        ),
-        focusedBorder: OutlineInputBorder(
-          borderSide: const BorderSide(color: Color(0xFFD4AF37), width: 2),
-          borderRadius: BorderRadius.circular(8),
-        ),
-        labelStyle: const TextStyle(color: Colors.white60),
-        prefixIconColor: Colors.white60,
-        hintStyle: const TextStyle(color: Colors.white38),
-        contentPadding: const EdgeInsets.symmetric(
-          horizontal: 16,
-          vertical: 14,
-        ),
-      ),
-      // 按钮样式
-      elevatedButtonTheme: ElevatedButtonThemeData(
-        style: ElevatedButton.styleFrom(
-          backgroundColor: const Color(0xFF0F3460),
-          foregroundColor: Colors.white,
-          padding: const EdgeInsets.symmetric(vertical: 16),
-          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
-          textStyle: const TextStyle(fontSize: 16, fontWeight: FontWeight.w500),
-          elevation: 2,
-          shadowColor: Colors.black54,
-        ),
-      ),
-      // 文本按钮样式（忘记密码）
-      textButtonTheme: TextButtonThemeData(
-        style: TextButton.styleFrom(
-          foregroundColor: const Color(0xFFD4AF37), // 金色文本，符合辅助色
-          textStyle: const TextStyle(fontSize: 14),
-        ),
-      ),
-      // 卡片样式
-      cardTheme: CardThemeData(
-        color: const Color(0xFF1E1E1E),
-        elevation: 4,
-        shape: RoundedRectangleBorder(
-          borderRadius: BorderRadius.circular(12),
-          side: const BorderSide(color: Color(0xFF333333)),
-        ),
-      ),
-      // 去除页面默认边距
-      scaffoldBackgroundColor: const Color(0xFF121212),
-    );
-
     return MaterialApp(
       title: '资产助手',
-      theme: darkTheme,
-      home: const LoginPage(),
+      debugShowCheckedModeBanner: false, // 移除 debug 标签
+      initialRoute: initialRoute,
+      routes: {
+        '/login': (context) => const LoginPage(),
+        '/home': (context) => const HomePage(),
+      },
+      theme: ThemeData(
+        // 金融暗夜风格主题配置
+        brightness: Brightness.dark,
+        colorScheme: ColorScheme.dark(
+          primary: const Color(0xFF0070F3), // 主色调：深蓝色
+          secondary: const Color(0xFF64FFDA), // 辅助色：亮青色
+          // 将 background 替换为 surface
+          surface: const Color(0xFF0F172A), // 背景色：深灰蓝
+          // 使用 surfaceContainerHighest 替代 deprecated 的 surfaceVariant
+          surfaceContainerHighest: const Color(0xFF1E293B), // 表面色：中灰蓝
+          onPrimary: Colors.white,
+          onSecondary: Colors.black87,
+          // 将 onBackground 替换为 onSurface
+          onSurface: Colors.white,
+          onSurfaceVariant: Colors.white70,
+        ),
+        inputDecorationTheme: InputDecorationTheme(
+          filled: true,
+          fillColor: const Color(0xFF1E293B),
+          border: OutlineInputBorder(
+            borderSide: const BorderSide(color: Color(0xFF334155)),
+            borderRadius: BorderRadius.circular(8),
+          ),
+          focusedBorder: OutlineInputBorder(
+            borderSide: const BorderSide(color: Color(0xFF0070F3), width: 2),
+            borderRadius: BorderRadius.circular(8),
+          ),
+          hintStyle: const TextStyle(color: Color(0xFF94A3B8)),
+          labelStyle: const TextStyle(color: Color(0xFFCBD5E1)),
+        ),
+        elevatedButtonTheme: ElevatedButtonThemeData(
+          style: ElevatedButton.styleFrom(
+            backgroundColor: const Color(0xFF0070F3),
+            foregroundColor: Colors.white,
+            padding: const EdgeInsets.symmetric(vertical: 16),
+            shape: RoundedRectangleBorder(
+              borderRadius: BorderRadius.circular(8),
+            ),
+            textStyle: const TextStyle(
+              fontSize: 16,
+              fontWeight: FontWeight.w500,
+            ),
+          ),
+        ),
+        textButtonTheme: TextButtonThemeData(
+          style: TextButton.styleFrom(
+            foregroundColor: const Color(0xFF94A3B8),
+            textStyle: const TextStyle(fontSize: 16),
+          ),
+        ),
+      ),
+      home: const LoginPage(), // 初始显示登录页
     );
   }
 }
diff --git a/frontend/asset_assistant/lib/pages/login_page.dart b/frontend/asset_assistant/lib/pages/login_page.dart
index 4171988..27d8890 100644
--- a/frontend/asset_assistant/lib/pages/login_page.dart
+++ b/frontend/asset_assistant/lib/pages/login_page.dart
@@ -1,8 +1,6 @@
 import 'package:asset_assistant/pages/home_page.dart';
-import 'package:asset_assistant/utils/host_manager.dart';
 import 'package:flutter/material.dart';
-import 'package:http/http.dart' as http;
-import 'dart:convert';
+import 'package:dio/dio.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
 // 登录页面
@@ -39,30 +37,36 @@ class _LoginPageState extends State<LoginPage> {
 
     try {
       // 构建请求URL
-      final url = HostManager().getUriHostByPath("/user/login");
-      debugPrint('url is: $url');
+      const baseUrl = 'https://api.fishestlife.com';
+      const path = '/user/login';
+      final url = '$baseUrl$path';
+      debugPrint('请求URL: $url');
+
+      // 初始化Dio实例
+      final dio = Dio();
 
       // 发送POST请求
-      final response = await http.post(
+      final response = await dio.post(
         url,
-        headers: {'Content-Type': 'application/json'},
-        body: json.encode({'account': account, 'password': password}),
+        data: {'account': account, 'password': password},
+        options: Options(
+          headers: {'Content-Type': 'application/json'},
+          responseType: ResponseType.json,
+        ),
       );
 
       // 解析响应
       if (response.statusCode == 200) {
-        final result = json.decode(response.body);
+        final result = response.data;
         // 打印后端返回的完整数据，确认code和状态
         debugPrint('登录响应：$result');
+
         if (result['success'] == true) {
           debugPrint('登录成功，准备跳转');
 
           // 保存token和用户信息到本地存储
           final prefs = await SharedPreferences.getInstance();
-          await prefs.setString(
-            'user_id',
-            result['data']['user_id'],
-          ); // 保存用户ID。
+          await prefs.setString('user_id', result['data']['user_id']); // 保存用户ID
           debugPrint('保存的用户ID: ${result['data']['user_id']}');
 
           // 延迟后再检查上下文是否仍有效
@@ -80,8 +84,27 @@ class _LoginPageState extends State<LoginPage> {
         _showDialog('错误', '服务器响应异常: ${response.statusCode}');
         debugPrint('服务器响应异常: ${response.statusCode}');
       }
+    } on DioException catch (e) {
+      // 处理Dio异常
+      String errorMessage = '网络请求失败';
+      if (e.response != null) {
+        errorMessage =
+            '请求失败: ${e.response?.statusCode} - ${e.response?.statusMessage}';
+        debugPrint('响应数据: ${e.response?.data}');
+      } else if (e.type == DioExceptionType.connectionTimeout) {
+        errorMessage = '连接超时，请检查网络';
+      } else if (e.type == DioExceptionType.receiveTimeout) {
+        errorMessage = '接收数据超时';
+      } else if (e.type == DioExceptionType.sendTimeout) {
+        errorMessage = '发送数据超时';
+      } else if (e.type == DioExceptionType.connectionError) {
+        errorMessage = '网络连接错误，请检查网络设置';
+      }
+
+      _showDialog('错误', errorMessage);
+      debugPrint('详细错误信息: ${e.toString()}');
     } catch (e) {
-      _showDialog('错误', '网络请求失败: $e');
+      _showDialog('错误', '发生未知错误: $e');
       debugPrint('详细错误信息: ${e.toString()}');
     } finally {
       if (mounted) {
diff --git a/frontend/asset_assistant/lib/utils/host_manager.dart b/frontend/asset_assistant/lib/utils/host_manager.dart
deleted file mode 100644
index 0e1ef0e..0000000
--- a/frontend/asset_assistant/lib/utils/host_manager.dart
+++ /dev/null
@@ -1,41 +0,0 @@
-import 'package:flutter/material.dart';
-
-class HostManager {
-  // 单例实例
-  static final HostManager _instance = HostManager._internal();
-
-  // 工厂构造函数，确保保证只有一个实例
-  factory HostManager() => _instance;
-
-  // 私有构造函数
-  HostManager._internal();
-
-  // 判断是否为开发环境
-  bool get isDebug => const bool.fromEnvironment('dart.vm.product') == false;
-
-  Uri getUriHostByPath(String path) {
-    final host = HostManager().getHostByPath(path);
-    final url = Uri.parse(host);
-    return url;
-  }
-
-  // 根据传入的path返回对应的host
-  // 可根据实际需求扩展path与host的映射关系
-  String getHostByPath(String path) {
-    debugPrint('path is:$path');
-    String host = "";
-    if (!isDebug) {
-      debugPrint('release model');
-      host = "https://api.fishestlife.com";
-    } else {
-      debugPrint('debug model');
-      if (path.startsWith('/user')) {
-        host = "https://api.fishestlife.com";
-      } else {
-        host = "";
-      }
-    }
-    debugPrint('url is:$host$path');
-    return host + path;
-  }
-}
diff --git a/frontend/asset_assistant/test/widget_test.dart b/frontend/asset_assistant/test/widget_test.dart
index 4bd1263..fcc4edc 100644
--- a/frontend/asset_assistant/test/widget_test.dart
+++ b/frontend/asset_assistant/test/widget_test.dart
@@ -13,7 +13,7 @@ import 'package:asset_assistant/main.dart';
 void main() {
   testWidgets('Counter increments smoke test', (WidgetTester tester) async {
     // Build our app and trigger a frame.
-    await tester.pumpWidget(const MyApp());
+    await tester.pumpWidget(const MyApp(initialRoute: ''));
 
     // Verify that our counter starts at 0.
     expect(find.text('0'), findsOneWidget);