diff --git a/lib/services/saf_storage_service.dart b/lib/services/saf_storage_service.dart
index 96e7d4d..3663d0b 100644
--- a/lib/services/saf_storage_service.dart
+++ b/lib/services/saf_storage_service.dart
@@ -3,6 +3,8 @@ import 'package:flutter/services.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import '../models/saf_permission_state.dart';
 
+/// SAF 存储服务
+/// 负责管理通过 SAF 授权的文件夹访问
 class SafStorageService {
   static final SafStorageService _instance = SafStorageService._internal();
   factory SafStorageService() => _instance;
@@ -14,7 +16,7 @@ class SafStorageService {
   static const String _prefKeySafUri = 'saf_storage_uri';
   String? _cachedUri;
 
-  // 🟢 初始化时从 SharedPreferences 恢复 URI
+  /// 初始化，从 SharedPreferences 恢复 URI
   Future<void> init() async {
     try {
       final prefs = await SharedPreferences.getInstance();
@@ -30,14 +32,16 @@ class SafStorageService {
     }
   }
 
+  /// 获取当前授权状态（简化版，直接根据缓存判断）
   Future<SafPermissionState> getPermissionState() async {
     if (_cachedUri == null || _cachedUri!.isEmpty) {
       return SafPermissionState.unauthorized;
     }
-    // 🟢 直接返回 authorized，相信缓存
+    // 直接返回 authorized，相信缓存
     return SafPermissionState.authorized;
   }
 
+  /// 请求 SAF 授权（引导用户选择文件夹）
   Future<SafAuthorizationResult> requestPermission() async {
     try {
       final String? uriString = await _channel.invokeMethod('selectFolder');
@@ -62,23 +66,57 @@ class SafStorageService {
     }
   }
 
+  /// 🟢 将 URI 传递给 Kotlin 端（用于恢复 safUri）
+  Future<bool> restoreUri() async {
+    if (_cachedUri == null || _cachedUri!.isEmpty) {
+      if (kDebugMode) {
+        print('[SAF] restoreUri: 缓存 URI 为空');
+      }
+      return false;
+    }
+    try {
+      final bool? result = await _channel.invokeMethod('restoreUri', {
+        'uri': _cachedUri,
+      });
+      if (result == true) {
+        if (kDebugMode) {
+          print('[SAF] restoreUri 成功: $_cachedUri');
+        }
+        return true;
+      } else {
+        if (kDebugMode) {
+          print('[SAF] restoreUri 失败: 返回 false');
+        }
+        return false;
+      }
+    } catch (e) {
+      if (kDebugMode) {
+        print('[SAF] restoreUri 异常: $e');
+      }
+      return false;
+    }
+  }
+
+  /// 检查指定日期的日志文件是否存在
   Future<bool> logFileExists(String fileName) async {
     final state = await getPermissionState();
     if (state != SafPermissionState.authorized) return false;
     try {
-      final files = await _channel.invokeMethod('listFiles');
-      if (files is List) {
-        return files.contains(fileName);
-      }
-      return false;
+      final files = await listFiles();
+      return files.contains(fileName);
     } catch (e) {
       return false;
     }
   }
 
+  /// 读取日志文件内容（返回行列表）
   Future<List<String>> readLogFile(String fileName) async {
+    // 🟢 先尝试恢复 URI
+    await restoreUri();
+
     final state = await getPermissionState();
     if (state != SafPermissionState.authorized) return [];
+
     try {
       final String? content = await _channel.invokeMethod('readLogFile', {
         'fileName': fileName,
@@ -93,9 +131,14 @@ class SafStorageService {
     }
   }
 
+  /// 获取文件夹中的文件列表
   Future<List<String>> listFiles() async {
+    // 🟢 先尝试恢复 URI
+    await restoreUri();
+
     final state = await getPermissionState();
     if (state != SafPermissionState.authorized) return [];
+
     try {
       final result = await _channel.invokeMethod('listFiles');
       if (result is List) {
@@ -110,16 +153,19 @@ class SafStorageService {
     }
   }
 
+  /// 验证授权是否有效（简化版）
   Future<bool> validatePermission() async {
     final state = await getPermissionState();
     return state == SafPermissionState.authorized;
   }
 
+  /// 清除缓存
   void _clearCache() {
     _cachedUri = null;
     _saveUri(null);
   }
 
+  /// 保存 URI 到 SharedPreferences
   Future<void> _saveUri(String? uri) async {
     try {
       final prefs = await SharedPreferences.getInstance();
@@ -141,5 +187,6 @@ class SafStorageService {
     }
   }
 
+  /// 获取缓存的 URI（用于调试）
   String? get cachedUri => _cachedUri;
 }