diff --git a/lib/common/models/sync/sync.dart b/lib/common/models/sync/sync.dart
new file mode 100644
index 0000000..8b7122d
--- /dev/null
+++ b/lib/common/models/sync/sync.dart
@@ -0,0 +1,11 @@
+import 'package:moodiary/common/values/sync_status.dart';
+
+class SyncResult<T> {
+  final SyncStatus status;
+  T? data;
+
+  SyncResult({
+    required this.status,
+    this.data,
+  });
+}
diff --git a/lib/common/values/sync_status.dart b/lib/common/values/sync_status.dart
new file mode 100644
index 0000000..088e99e
--- /dev/null
+++ b/lib/common/values/sync_status.dart
@@ -0,0 +1,32 @@
+/// 同步状态枚举
+enum SyncStatus {
+  /// 已分配任务但还未执行
+  pending,
+
+  /// 正在同步中
+  syncing,
+
+  /// 同步成功
+  success,
+
+  /// 同步失败
+  failure,
+
+  /// 验证失败
+  invalid,
+
+  /// 未知状态
+  unknown,
+}
+
+/// 连接状态枚举
+enum ConnectivityStatus {
+  /// 未连接
+  disconnected,
+
+  /// 正在连接
+  connecting,
+
+  /// 已连接
+  connected,
+}
diff --git a/lib/components/web_dav/web_dav_logic.dart b/lib/components/web_dav/web_dav_logic.dart
index 5bb7094..1802573 100644
--- a/lib/components/web_dav/web_dav_logic.dart
+++ b/lib/components/web_dav/web_dav_logic.dart
@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:moodiary/common/values/webdav.dart';
 import 'package:moodiary/presentation/pref.dart';
+import 'package:moodiary/presentation/secure_storage.dart';
 import 'package:moodiary/utils/notice_util.dart';
 import 'package:moodiary/utils/webdav_util.dart';
 import 'package:refreshed/refreshed.dart';
@@ -27,6 +28,7 @@ class WebDavLogic extends GetxController {
     if (state.hasOption.value) {
       await checkConnectivity();
     }
+    await checkHasUserKey();
     super.onReady();
   }
 
@@ -41,6 +43,11 @@ class WebDavLogic extends GetxController {
     super.onClose();
   }
 
+  Future<void> checkHasUserKey() async {
+    state.hasUserKey.value =
+        (await SecureStorageUtil.getValue('userKey')) != null;
+  }
+
   Future<void> checkConnectivity() async {
     state.connectivityStatus.value = WebDavConnectivityStatus.connecting;
     final res = await webDav.checkConnectivity();
@@ -111,4 +118,9 @@ class WebDavLogic extends GetxController {
     await PrefUtil.setValue<bool>('autoSyncAfterChange', value);
     state.autoSyncAfterChange.value = value;
   }
+
+  void setSyncEncryption(bool value) async {
+    await PrefUtil.setValue<bool>('syncEncryption', value);
+    state.syncEncryption.value = value;
+  }
 }
diff --git a/lib/components/web_dav/web_dav_state.dart b/lib/components/web_dav/web_dav_state.dart
index 07a5456..6322fb0 100644
--- a/lib/components/web_dav/web_dav_state.dart
+++ b/lib/components/web_dav/web_dav_state.dart
@@ -18,5 +18,8 @@ class WebDavState {
   RxBool autoSyncAfterChange =
       PrefUtil.getValue<bool>('autoSyncAfterChange')!.obs;
 
+  RxBool syncEncryption = PrefUtil.getValue<bool>('syncEncryption')!.obs;
+  RxBool hasUserKey = false.obs;
+
   WebDavState();
 }
diff --git a/lib/components/web_dav/web_dav_view.dart b/lib/components/web_dav/web_dav_view.dart
index 025e66f..80922db 100644
--- a/lib/components/web_dav/web_dav_view.dart
+++ b/lib/components/web_dav/web_dav_view.dart
@@ -59,6 +59,14 @@ class WebDavComponent extends StatelessWidget {
             subtitle: l10n.webdavSyncAfterChangeDes,
           );
         }),
+        Obx(() {
+          return AdaptiveSwitchListTile(
+            value: state.syncEncryption.value,
+            onChanged: state.hasUserKey.value ? logic.setSyncEncryption : null,
+            title: Text(l10n.webdavSyncEncryption),
+            subtitle: l10n.webdavSyncEncryptionDes,
+          );
+        }),
         Padding(
           padding: const EdgeInsets.all(16.0),
           child: Form(
diff --git a/lib/services/sync/impl/minio_impl.dart b/lib/services/sync/impl/minio_impl.dart
new file mode 100644
index 0000000..fa3596a
--- /dev/null
+++ b/lib/services/sync/impl/minio_impl.dart
@@ -0,0 +1,108 @@
+// import 'dart:ui';
+//
+// import 'package:minio/minio.dart';
+// import 'package:moodiary/common/models/isar/diary.dart';
+// import 'package:moodiary/common/models/sync/sync.dart';
+// import 'package:moodiary/services/sync/sync.dart';
+//
+// class MinioSyncServiceImpl implements SyncService {
+//   final String endPoint;
+//
+//   final String accessKey;
+//
+//   final String secretKey;
+//
+//   final String bucketName;
+//
+//   late final Minio _client;
+//
+//   MinioSyncServiceImpl({
+//     required this.endPoint,
+//     required this.accessKey,
+//     required this.secretKey,
+//     required this.bucketName,
+//   });
+//
+//   @override
+//   Future<void> init() async {
+//     _client = Minio(
+//       endPoint: endPoint,
+//       accessKey: accessKey,
+//       secretKey: secretKey,
+//     );
+//   }
+//
+//   @override
+//   Future<bool> checkConnectivity() {
+//     // TODO: implement checkConnectivity
+//     throw UnimplementedError();
+//   }
+//
+//   @override
+//   Future<SyncResult<Map<String, String>>> fetchServerSyncData() {
+//     // TODO: implement fetchServerSyncData
+//     throw UnimplementedError();
+//   }
+//
+//   @override
+//   Future<SyncResult> updateServerSyncData(Map<String, String> syncData) {
+//     // TODO: implement updateServerSyncData
+//     throw UnimplementedError();
+//   }
+//
+//   @override
+//   Future<SyncResult> deleteDiary({
+//     required Diary diary,
+//     VoidCallback? onStart,
+//     VoidCallback? onComplete,
+//     Function(int p1, int p2)? onProgress,
+//   }) {
+//     // TODO: implement deleteDiary
+//     throw UnimplementedError();
+//   }
+//
+//   @override
+//   Future<SyncResult> downloadDiary({
+//     required String diaryId,
+//     VoidCallback? onStart,
+//     VoidCallback? onComplete,
+//     Function(int p1, int p2)? onProgress,
+//   }) {
+//     // TODO: implement downloadDiary
+//     throw UnimplementedError();
+//   }
+//
+//   @override
+//   Future<SyncResult> updateDiary({
+//     required Diary oldDiary,
+//     required Diary newDiary,
+//     VoidCallback? onStart,
+//     VoidCallback? onComplete,
+//     Function(int p1, int p2)? onProgress,
+//   }) {
+//     // TODO: implement updateDiary
+//     throw UnimplementedError();
+//   }
+//
+//   @override
+//   Future<SyncResult> uploadDiary({
+//     required Diary diary,
+//     VoidCallback? onStart,
+//     VoidCallback? onComplete,
+//     Function(int p1, int p2)? onProgress,
+//   }) {
+//     // TODO: implement uploadDiary
+//     throw UnimplementedError();
+//   }
+//
+//   @override
+//   Future<SyncResult> syncDiary({
+//     required List<Diary> diaries,
+//     VoidCallback? onStart,
+//     VoidCallback? onComplete,
+//     Function(int p1, int p2)? onProgress,
+//   }) {
+//     // TODO: implement syncDiary
+//     throw UnimplementedError();
+//   }
+// }
diff --git a/lib/services/sync/impl/webdav_impl.dart b/lib/services/sync/impl/webdav_impl.dart
new file mode 100644
index 0000000..902fbf4
--- /dev/null
+++ b/lib/services/sync/impl/webdav_impl.dart
@@ -0,0 +1,266 @@
+import 'dart:async';
+import 'dart:convert';
+
+import 'package:flutter/material.dart';
+import 'package:moodiary/common/models/isar/diary.dart';
+import 'package:moodiary/common/models/sync/sync.dart';
+import 'package:moodiary/common/values/sync_status.dart';
+import 'package:moodiary/common/values/webdav.dart';
+import 'package:moodiary/services/sync/sync.dart';
+import 'package:moodiary/utils/log_util.dart';
+import 'package:refreshed/refreshed.dart';
+import 'package:webdav_client/webdav_client.dart' as webdav;
+
+class WebdavSyncServiceImpl implements SyncService {
+  final String url;
+  final String username;
+  final String password;
+
+  late final webdav.Client _client;
+  final Rx<ConnectivityStatus> _connectivity =
+      ConnectivityStatus.connecting.obs;
+
+  bool get _isConnected => _connectivity.value == ConnectivityStatus.connected;
+  late Map<String, String> _syncStatus;
+  Timer? _connectivityTimer;
+
+  WebdavSyncServiceImpl({
+    required this.url,
+    required this.username,
+    required this.password,
+  });
+
+  @override
+  Future<void> init() async {
+    _client = webdav.newClient(
+      url,
+      user: username,
+      password: password,
+      debug: false,
+    );
+    await checkConnectivity();
+    startPolling();
+  }
+
+  void startPolling({Duration interval = const Duration(minutes: 1)}) {
+    _connectivityTimer?.cancel();
+    _connectivityTimer = Timer.periodic(interval, (timer) async {
+      await checkConnectivity();
+    });
+  }
+
+  void stopPolling() {
+    _connectivityTimer?.cancel();
+  }
+
+  @override
+  Future<void> checkConnectivity() async {
+    _connectivity.value = ConnectivityStatus.connecting;
+    try {
+      await _client.ping().timeout(const Duration(seconds: 3));
+      _connectivity.value = ConnectivityStatus.connected;
+    } catch (e) {
+      LogUtil.printError("WebDAV Error Check Connectivity", error: e);
+      _connectivity.value = ConnectivityStatus.disconnected;
+    }
+  }
+
+  Future<void> initDir() async {
+    if (!_isConnected) return;
+
+    final paths = [
+      WebDavOptions.imagePath,
+      WebDavOptions.videoPath,
+      WebDavOptions.audioPath,
+      WebDavOptions.diaryPath,
+      WebDavOptions.categoryPath,
+    ];
+
+    for (final path in paths) {
+      try {
+        await _client.mkdirAll(path);
+      } catch (e) {
+        LogUtil.printError("创建目录失败: $path", error: e);
+      }
+    }
+
+    try {
+      await _client.read(WebDavOptions.syncFlagPath);
+    } catch (_) {
+      await _client.write(
+        WebDavOptions.syncFlagPath,
+        utf8.encode(jsonEncode({})),
+      );
+    }
+  }
+
+  @override
+  Future<SyncResult<Map<String, String>>> fetchServerSyncData() async {
+    if (!_isConnected) return SyncResult(status: SyncStatus.invalid);
+
+    try {
+      final response = await _client.read(WebDavOptions.syncFlagPath);
+      if (response.isNotEmpty) {
+        return SyncResult(
+          status: SyncStatus.success,
+          data: jsonDecode(utf8.decode(response)) as Map<String, String>,
+        );
+      }
+    } catch (e) {
+      LogUtil.printError("获取服务器同步数据失败", error: e);
+    }
+    return SyncResult(status: SyncStatus.failure);
+  }
+
+  @override
+  Future<SyncResult<bool>> updateServerSyncData(
+    Map<String, String> syncData,
+  ) async {
+    if (!_isConnected) return SyncResult(status: SyncStatus.invalid);
+
+    try {
+      await _client.write(
+        WebDavOptions.syncFlagPath,
+        utf8.encode(jsonEncode(syncData)),
+      );
+      return SyncResult(status: SyncStatus.success, data: true);
+    } catch (e) {
+      LogUtil.printError("更新服务器同步数据失败", error: e);
+      return SyncResult(status: SyncStatus.failure);
+    }
+  }
+
+  @override
+  Future<SyncResult> deleteDiary({
+    required Diary diary,
+    VoidCallback? onStart,
+    VoidCallback? onComplete,
+    Function(int p1, int p2)? onProgress,
+  }) async {
+    if (!_isConnected) return SyncResult(status: SyncStatus.invalid);
+
+    if (!_syncStatus.containsKey(diary.id)) {
+      return SyncResult(status: SyncStatus.success);
+    }
+
+    _syncStatus[diary.id] = 'delete';
+    await updateServerSyncData(_syncStatus);
+
+    // 批量删除文件
+    try {
+      await Future.wait([
+        _deleteFile('${WebDavOptions.diaryPath}/${diary.id}.json'),
+        _deleteFile('${WebDavOptions.diaryPath}/${diary.id}.bin'),
+        _deleteFiles(
+          diary.imageName,
+          '${WebDavOptions.imagePath}/${diary.id}',
+          'image',
+        ),
+        _deleteFiles(
+          diary.audioName,
+          '${WebDavOptions.audioPath}/${diary.id}',
+          'audio',
+        ),
+        _deleteFiles(
+          diary.videoName,
+          '${WebDavOptions.videoPath}/${diary.id}',
+          'video',
+        ),
+        _deleteFiles(
+          diary.videoName
+              .map(
+                (videoName) => 'thumbnail-${videoName.substring(6, 42)}.jpeg',
+              )
+              .toList(),
+          '${WebDavOptions.videoPath}/${diary.id}',
+          'thumbnail',
+        ),
+        _deleteFile('${WebDavOptions.imagePath}/${diary.id}'),
+        _deleteFile('${WebDavOptions.audioPath}/${diary.id}'),
+        _deleteFile('${WebDavOptions.videoPath}/${diary.id}'),
+      ]);
+    } catch (e) {
+      LogUtil.printError("删除日记失败", error: e);
+      return SyncResult(status: SyncStatus.failure);
+    }
+
+    return SyncResult(status: SyncStatus.success);
+  }
+
+  Future<void> _deleteFile(String path) async {
+    try {
+      await _client.remove(path);
+    } catch (e) {
+      rethrow;
+    }
+  }
+
+  Future<void> _deleteFiles(
+    List<String> fileNames,
+    String resourcePath,
+    String type,
+  ) async {
+    for (final fileName in fileNames) {
+      await _deleteFile('$resourcePath/$fileName');
+    }
+  }
+
+  @override
+  Future<SyncResult> downloadDiary({
+    required String diaryId,
+    VoidCallback? onStart,
+    VoidCallback? onComplete,
+    Function(int p1, int p2)? onProgress,
+  }) async {
+    if (!_isConnected) return SyncResult(status: SyncStatus.invalid);
+    debugPrint("下载日记 $diaryId (未实现)");
+    return SyncResult(status: SyncStatus.failure);
+  }
+
+  @override
+  Future<SyncResult> uploadDiary({
+    required Diary diary,
+    VoidCallback? onStart,
+    VoidCallback? onComplete,
+    Function(int p1, int p2)? onProgress,
+  }) async {
+    if (!_isConnected) return SyncResult(status: SyncStatus.invalid);
+    debugPrint("上传日记 ${diary.id} (未实现)");
+    return SyncResult(status: SyncStatus.failure);
+  }
+
+  void dispose() {
+    stopPolling();
+  }
+
+  @override
+  Future<SyncResult> updateDiary({
+    required Diary oldDiary,
+    required Diary newDiary,
+    VoidCallback? onStart,
+    VoidCallback? onComplete,
+    Function(int p1, int p2)? onProgress,
+  }) {
+    // TODO: implement updateDiary
+    throw UnimplementedError();
+  }
+
+  @override
+  Future<SyncResult> syncDiary({
+    required List<Diary> diaries,
+    VoidCallback? onUpload,
+    VoidCallback? onDownload,
+    VoidCallback? onComplete,
+    Function(int p1, int p2)? onProgress,
+  }) async {
+    throw UnimplementedError();
+  }
+
+  @override
+  // TODO: implement hasConfig
+  bool get hasConfig => throw UnimplementedError();
+
+  @override
+  // TODO: implement connectivity
+  ConnectivityStatus get rxConnectivity => _connectivity.value;
+}
diff --git a/lib/services/sync/sync.dart b/lib/services/sync/sync.dart
new file mode 100644
index 0000000..93aea01
--- /dev/null
+++ b/lib/services/sync/sync.dart
@@ -0,0 +1,153 @@
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+import 'package:moodiary/common/models/isar/diary.dart';
+import 'package:moodiary/common/models/sync/sync.dart';
+import 'package:moodiary/common/values/sync_status.dart';
+import 'package:moodiary/services/sync/impl/webdav_impl.dart';
+import 'package:refreshed/refreshed.dart';
+
+/// 同步服务的抽象基类
+abstract class SyncService {
+  /// 是否有配置
+  bool get hasConfig;
+
+  /// 连通性
+  /// 返回值为 [ConnectivityStatus]
+  /// 这是一个响应式变量，可以通过 [Obx] 进行监听
+  ConnectivityStatus get rxConnectivity;
+
+  /// 初始化方法
+  Future<void> init();
+
+  /// 连通性检查
+  Future<void> checkConnectivity();
+
+  /// 同步日记
+  /// 这个方法会自动进行增量同步
+  Future<SyncResult> syncDiary({
+    required List<Diary> diaries,
+    VoidCallback? onUpload,
+    VoidCallback? onDownload,
+    VoidCallback? onComplete,
+    Function(int, int)? onProgress,
+  });
+
+  /// 上传日记
+  /// 可选参数为加密
+  /// 返回值 [SyncResult] 为同步结果
+  /// [onStart] 为开始回调
+  /// [onComplete] 为完成回调
+  /// [onProgress] 为进度回调
+  Future<SyncResult> uploadDiary({
+    required Diary diary,
+    VoidCallback? onStart,
+    VoidCallback? onComplete,
+    Function(int, int)? onProgress,
+  });
+
+  /// 更新日记
+  /// 可选参数为加密
+  /// 返回值 [SyncResult] 为同步结果
+  /// [onStart] 为开始回调
+  /// [onComplete] 为完成回调
+  /// [onProgress] 为进度回调
+  Future<SyncResult> updateDiary({
+    required Diary oldDiary,
+    required Diary newDiary,
+    VoidCallback? onStart,
+    VoidCallback? onComplete,
+    Function(int, int)? onProgress,
+  });
+
+  /// 下载日记
+  /// 返回值 [SyncResult] 为同步结果
+  /// [onStart] 为开始回调
+  /// [onComplete] 为完成回调
+  /// [onProgress] 为进度回调
+  Future<SyncResult> downloadDiary({
+    required String diaryId,
+    VoidCallback? onStart,
+    VoidCallback? onComplete,
+    Function(int, int)? onProgress,
+  });
+
+  /// 删除日记
+  /// 返回值 [SyncResult] 为同步结果
+  /// [onStart] 为开始回调
+  /// [onComplete] 为完成回调
+  /// [onProgress] 为进度回调
+  Future<SyncResult> deleteDiary({
+    required Diary diary,
+    VoidCallback? onStart,
+    VoidCallback? onComplete,
+    Function(int, int)? onProgress,
+  });
+
+  /// 获取服务器同步数据
+  /// 文件名为 [sync.json]
+  /// 返回值  [SyncResult] 为同步结果
+  /// [Map] 为同步数据
+  Future<SyncResult<Map<String, String>>> fetchServerSyncData();
+
+  /// 更新服务器同步数据
+  Future<SyncResult> updateServerSyncData(Map<String, String> syncData);
+}
+
+/// 同步服务的具体实现
+/// 通过 [WebdavSyncServiceImpl] 进行同步
+class WebdavSyncService extends GetxService {
+  late final SyncService _webdavSyncService;
+
+  Future<void> init({
+    required String baseUrl,
+    required String username,
+    required String password,
+  }) async {
+    _webdavSyncService = WebdavSyncServiceImpl(
+      url: baseUrl,
+      username: username,
+      password: password,
+    );
+    await _webdavSyncService.init();
+  }
+
+  @override
+  void onInit() {
+    // TODO: implement onInit
+    super.onInit();
+  }
+
+  @override
+  void onClose() {
+    // TODO: implement onClose
+    super.onClose();
+  }
+
+  @override
+  void onReady() {
+    // TODO: implement onReady
+    super.onReady();
+  }
+}
+
+// /// 通过 MinIO 对象存储进行同步
+// /// 通过 [MinioSyncServiceImpl] 进行同步
+// class MinioSyncService extends GetxService {
+//   late final SyncService _minioSyncService;
+//
+//   Future<void> init({
+//     required String endPoint,
+//     required String accessKey,
+//     required String secretKey,
+//     required String bucketName,
+//   }) async {
+//     _minioSyncService = MinioSyncServiceImpl(
+//       endPoint: endPoint,
+//       accessKey: accessKey,
+//       secretKey: secretKey,
+//       bucketName: bucketName,
+//     );
+//     await _minioSyncService.init();
+//   }
+// }
diff --git a/lib/utils/webdav_util.dart b/lib/utils/webdav_util.dart
index a441f76..092213a 100644
--- a/lib/utils/webdav_util.dart
+++ b/lib/utils/webdav_util.dart
@@ -1,6 +1,7 @@
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
+import 'dart:typed_data';
 
 import 'package:flutter/foundation.dart' as flutter;
 import 'package:moodiary/common/models/isar/category.dart';
@@ -9,6 +10,8 @@ import 'package:moodiary/common/values/webdav.dart';
 import 'package:moodiary/pages/home/diary/diary_logic.dart';
 import 'package:moodiary/presentation/isar.dart';
 import 'package:moodiary/presentation/pref.dart';
+import 'package:moodiary/presentation/secure_storage.dart';
+import 'package:moodiary/utils/aes_util.dart';
 import 'package:moodiary/utils/file_util.dart';
 import 'package:moodiary/utils/log_util.dart';
 import 'package:refreshed/refreshed.dart';
@@ -40,7 +43,6 @@ class WebDavUtil {
       _client = null;
     }
     // 尝试连接，如果失败，
-
     try {
       _client = webdav.newClient(
         webDavOption[0],
@@ -134,6 +136,7 @@ class WebDavUtil {
     await updateServerSyncData(serverSyncData);
     // 删除日记json
     await _client!.remove('${WebDavOptions.diaryPath}/${diary.id}.json');
+    await _client!.remove('${WebDavOptions.diaryPath}/${diary.id}.bin');
     // 遍历删除日记资源文件
     await _deleteFiles(
         diary.imageName, '${WebDavOptions.imagePath}/${diary.id}', 'image');
@@ -341,7 +344,30 @@ class WebDavUtil {
     }
   }
 
+  Future<bool> _checkShouldEncrypt() async {
+    return PrefUtil.getValue<bool>('syncEncryption') == true &&
+        (await SecureStorageUtil.getValue('userKey')) != null;
+  }
+
   Future<void> _uploadDiary(Diary diary) async {
+    Uint8List diaryData;
+    String diaryPath;
+    // 检查有没有开启加密
+    final shouldEncrypt = await _checkShouldEncrypt();
+    if (shouldEncrypt) {
+      // 尝试获取用户密钥
+      final userKey = await SecureStorageUtil.getValue('userKey');
+      // 生成加密密钥, 用日记 ID 和用户密钥生成
+      final key = await AesUtil.deriveKey(salt: diary.id, userKey: userKey!);
+      // 加密日记内容
+      diaryPath = '${WebDavOptions.diaryPath}/${diary.id}.bin';
+      diaryData =
+          await AesUtil.encrypt(key: key, data: jsonEncode(diary.toJson()));
+    } else {
+      diaryPath = '${WebDavOptions.diaryPath}/${diary.id}.json';
+      diaryData = utf8.encode(jsonEncode(diary.toJson()));
+    }
+
     // 检查并上传分类
     if (diary.categoryId != null) {
       final categoryName =
@@ -350,20 +376,16 @@ class WebDavUtil {
         await _uploadCategory(diary.categoryId!, categoryName);
       }
     }
-
-    // 上传日记 JSON 数据
-    final diaryPath = '${WebDavOptions.diaryPath}/${diary.id}.json';
-    final diaryData = jsonEncode(diary.toJson());
-    LogUtil.printInfo(diaryData);
     try {
       _client!.setHeaders({
         'accept-charset': 'utf-8',
-        'Content-Type': 'application/json',
+        'Content-Type':
+            shouldEncrypt ? 'application/octet-stream' : 'application/json',
       });
-      await _client!.write(diaryPath, utf8.encode(diaryData));
-      LogUtil.printInfo('Diary JSON uploaded: $diaryPath');
+      await _client!.write(diaryPath, diaryData);
+      LogUtil.printInfo('Diary  uploaded: $diaryPath');
     } catch (e) {
-      LogUtil.printInfo('Failed to upload diary JSON: $e');
+      LogUtil.printInfo('Failed to upload diary : $e');
       rethrow;
     }
 
@@ -422,17 +444,43 @@ class WebDavUtil {
 
   Future<Diary> _downloadDiary(String diaryId) async {
     // 下载日记 JSON 数据
-    final diaryPath = '${WebDavOptions.diaryPath}/$diaryId.json';
+    final normalDiaryPath = '${WebDavOptions.diaryPath}/$diaryId.json';
+    final encryptedDiaryPath = '${WebDavOptions.diaryPath}/$diaryId.bin';
     late Diary diary;
-
     try {
-      final diaryData = await _client!.read(diaryPath);
-      diary = await flutter.compute(Diary.fromJson,
-          jsonDecode(utf8.decode(diaryData)) as Map<String, dynamic>);
-      LogUtil.printInfo('Diary JSON downloaded: $diaryPath');
+      // 先尝试普通 JSON 格式
+      try {
+        final diaryData = await _client!.read(normalDiaryPath);
+        diary = await flutter.compute(Diary.fromJson,
+            jsonDecode(utf8.decode(diaryData)) as Map<String, dynamic>);
+        LogUtil.printInfo('Diary JSON downloaded: $normalDiaryPath');
+      } catch (e) {
+        LogUtil.printInfo('Failed to download normal JSON: $e');
+        // 再尝试二进制格式
+        try {
+          final encryptedDiaryData = await _client!.read(encryptedDiaryPath);
+          // 解密日记内容
+          final userKey = await SecureStorageUtil.getValue('userKey');
+          final shouldEncrypt = await _checkShouldEncrypt();
+          if (!shouldEncrypt) {
+            throw Exception('User key not found or encryption not enabled');
+          }
+          final key = await AesUtil.deriveKey(salt: diaryId, userKey: userKey!);
+          final decryptedData = await AesUtil.decrypt(
+            key: key,
+            encryptedData: Uint8List.fromList(encryptedDiaryData),
+          );
+          diary = await flutter.compute(Diary.fromJson,
+              jsonDecode(decryptedData) as Map<String, dynamic>);
+          LogUtil.printInfo('Diary binary downloaded: $encryptedDiaryPath');
+        } catch (e) {
+          LogUtil.printInfo('Failed to download binary diary: $e');
+          // 两种方式都失败，抛出最终异常
+          rethrow;
+        }
+      }
     } catch (e) {
-      LogUtil.printInfo('Failed to download diary JSON: $e');
-      rethrow;
+      throw Exception('Failed to download diary: $e');
     }
 
     // 同步分类