diff --git a/lib/controller/message/conversation_controller.dart b/lib/controller/message/conversation_controller.dart
index 605d2d2..8c01d61 100644
--- a/lib/controller/message/conversation_controller.dart
+++ b/lib/controller/message/conversation_controller.dart
@@ -35,6 +35,14 @@ class ExtendedUserInfo {
   }
 }
 
+// 筛选类型枚举
+enum FilterType {
+  none,           // 无筛选
+  lastChatTime,  // 最后聊天时间
+  unread,        // 未读消息
+  online,        // 当前在线
+}
+
 class ConversationController extends GetxController {
   // 会话列表数据
   final conversations = <EMConversation>[].obs;
@@ -46,6 +54,9 @@ class ConversationController extends GetxController {
   // 用户信息缓存（userId -> ExtendedUserInfo）
   final Map<String, ExtendedUserInfo> _userInfoCache = {};
   
+  // 筛选类型
+  final filterType = FilterType.none.obs;
+  
   /// 缓存用户信息（公开方法，供 ChatController 调用）
   void cacheUserInfo(String userId, ExtendedUserInfo userInfo) {
     _userInfoCache[userId] = userInfo;
@@ -591,4 +602,132 @@ class ConversationController extends GetxController {
       return false;
     }
   }
+
+  /// 设置筛选类型
+  void setFilterType(FilterType type) {
+    filterType.value = type;
+    if (Get.isLogEnable) {
+      Get.log('✅ [ConversationController] 设置筛选类型: $type');
+    }
+  }
+
+  /// 获取筛选后的会话列表
+  Future<List<EMConversation>> getFilteredConversations() async {
+    List<EMConversation> filteredList = List.from(conversations);
+
+    switch (filterType.value) {
+      case FilterType.none:
+        // 无筛选，按默认顺序返回
+        break;
+      
+      case FilterType.lastChatTime:
+        // 按最后聊天时间排序（最新的在前）
+        // 先获取所有消息的时间戳
+        final List<MapEntry<EMConversation, int>> conversationTimes = await Future.wait(
+          filteredList.map((conv) async {
+            final message = await lastMessage(conv);
+            final time = message?.serverTime ?? 0;
+            return MapEntry(conv, time);
+          }),
+        );
+        // 按时间戳排序（降序，最新的在前）
+        conversationTimes.sort((a, b) => b.value.compareTo(a.value));
+        filteredList = conversationTimes.map((entry) => entry.key).toList();
+        break;
+      
+      case FilterType.unread:
+        // 只显示有未读消息的会话
+        final List<MapEntry<EMConversation, int>> conversationUnreads = await Future.wait(
+          filteredList.map((conv) async {
+            final unreadCount = await getUnreadCount(conv);
+            return MapEntry(conv, unreadCount);
+          }),
+        );
+        // 过滤出有未读消息的会话
+        final unreadConversations = conversationUnreads
+            .where((entry) => entry.value > 0)
+            .toList();
+        // 按未读数量排序（未读数多的在前）
+        unreadConversations.sort((a, b) => b.value.compareTo(a.value));
+        filteredList = unreadConversations.map((entry) => entry.key).toList();
+        break;
+      
+      case FilterType.online:
+        // 只显示在线用户的会话
+        final List<EMConversation?> onlineConversations = await Future.wait(
+          filteredList.map((conv) async {
+            final isOnline = await _checkUserOnline(conv);
+            return isOnline ? conv : null;
+          }),
+        );
+        filteredList = onlineConversations
+            .whereType<EMConversation>()
+            .toList();
+        break;
+    }
+
+    return filteredList;
+  }
+
+  /// 检查用户是否在线
+  Future<bool> _checkUserOnline(EMConversation conversation) async {
+    try {
+      // 获取会话的最新消息
+      final message = await lastMessage(conversation);
+      if (message == null) {
+        return false;
+      }
+
+      // 从消息扩展字段中获取在线状态
+      Map<String, dynamic>? attributes;
+      try {
+        attributes = message.attributes;
+      } catch (e) {
+        return false;
+      }
+
+      if (attributes == null || attributes.isEmpty) {
+        return false;
+      }
+
+      // 检查在线状态字段
+      // 接收消息：检查 sender_isOnline
+      // 发送消息：检查 receiver_isOnline
+      String? isOnlineStr;
+      String? lastActiveTimeStr;
+
+      if (message.direction == MessageDirection.RECEIVE) {
+        isOnlineStr = attributes['sender_isOnline'] as String?;
+        lastActiveTimeStr = attributes['sender_lastActiveTime'] as String?;
+      } else {
+        isOnlineStr = attributes['receiver_isOnline'] as String?;
+        lastActiveTimeStr = attributes['receiver_lastActiveTime'] as String?;
+      }
+
+      if (isOnlineStr == 'true') {
+        // 进一步检查最后活跃时间（5分钟内认为在线）
+        if (lastActiveTimeStr != null) {
+          try {
+            final lastActiveTime = int.parse(lastActiveTimeStr);
+            final now = DateTime.now().millisecondsSinceEpoch;
+            final diff = now - lastActiveTime;
+            // 5分钟内认为在线（5 * 60 * 1000 毫秒）
+            return diff < 5 * 60 * 1000;
+          } catch (e) {
+            // 解析失败，使用 isOnline 字段
+            return true;
+          }
+        } else {
+          return true;
+        }
+      }
+
+      return false;
+    } catch (e) {
+      if (Get.isLogEnable) {
+        Get.log('⚠️ [ConversationController] 检查用户在线状态失败: $e');
+      }
+      return false;
+    }
+  }
 }
\ No newline at end of file
diff --git a/lib/pages/message/conversation_tab.dart b/lib/pages/message/conversation_tab.dart
index e6405b4..f5424d9 100644
--- a/lib/pages/message/conversation_tab.dart
+++ b/lib/pages/message/conversation_tab.dart
@@ -44,14 +44,43 @@ class _ConversationTabState extends State<ConversationTab>
               );
             }
 
-            return ListView.builder(
-              padding: const EdgeInsets.only(top: 8),
-              itemCount: controller.conversations.length,
-              itemBuilder: (context, index) {
-                final conversation = controller.conversations[index];
-                return _buildConversationItem(conversation);
-              },
-            );
+            // 监听筛选类型变化，获取筛选后的会话列表
+            // 使用 Obx 监听筛选类型变化，触发 FutureBuilder 重建
+            return Obx(() {
+              return FutureBuilder<List<EMConversation>>(
+                future: controller.getFilteredConversations(),
+                builder: (context, snapshot) {
+                  if (snapshot.connectionState == ConnectionState.waiting) {
+                    return const Center(child: CircularProgressIndicator());
+                  }
+
+                  final filteredConversations = snapshot.data ?? [];
+
+                  if (filteredConversations.isEmpty) {
+                    return Center(
+                      child: Text(
+                        controller.filterType.value == FilterType.none
+                            ? '暂无会话'
+                            : '暂无符合条件的会话',
+                        style: const TextStyle(
+                          fontSize: 14,
+                          color: Colors.grey,
+                        ),
+                      ),
+                    );
+                  }
+
+                  return ListView.builder(
+                    padding: const EdgeInsets.only(top: 8),
+                    itemCount: filteredConversations.length,
+                    itemBuilder: (context, index) {
+                      final conversation = filteredConversations[index];
+                      return _buildConversationItem(conversation);
+                    },
+                  );
+                },
+              );
+            });
           }),
         ),
       ],
diff --git a/lib/pages/message/message_page.dart b/lib/pages/message/message_page.dart
index f9937a9..979a1d9 100644
--- a/lib/pages/message/message_page.dart
+++ b/lib/pages/message/message_page.dart
@@ -144,6 +144,8 @@ class _MessagePageState extends State<MessagePage> with AutomaticKeepAliveClient
       overlay.size.height - (buttonPosition.dy + buttonSize.height + 4), // bottom
     );
 
+    final ConversationController conversationController = Get.find<ConversationController>();
+
     showMenu(
       context: context,
       position: position,
@@ -158,9 +160,15 @@ class _MessagePageState extends State<MessagePage> with AutomaticKeepAliveClient
             icon: Assets.imagesLastMsgIcon,
             text: '最后聊天时间',
             showDivider: true,
+            isSelected: conversationController.filterType.value == FilterType.lastChatTime,
             onTap: () {
               Navigator.pop(context);
-              // TODO: 实现按最后聊天时间排序
+              // 如果已选中，则取消筛选；否则设置筛选
+              if (conversationController.filterType.value == FilterType.lastChatTime) {
+                conversationController.setFilterType(FilterType.none);
+              } else {
+                conversationController.setFilterType(FilterType.lastChatTime);
+              }
             },
           ),
         ),
@@ -170,9 +178,15 @@ class _MessagePageState extends State<MessagePage> with AutomaticKeepAliveClient
             icon: Assets.imagesUnreadIcon,
             text: '未读消息',
             showDivider: true,
+            isSelected: conversationController.filterType.value == FilterType.unread,
             onTap: () {
               Navigator.pop(context);
-              // TODO: 实现按未读消息筛选
+              // 如果已选中，则取消筛选；否则设置筛选
+              if (conversationController.filterType.value == FilterType.unread) {
+                conversationController.setFilterType(FilterType.none);
+              } else {
+                conversationController.setFilterType(FilterType.unread);
+              }
             },
           ),
         ),
@@ -182,9 +196,15 @@ class _MessagePageState extends State<MessagePage> with AutomaticKeepAliveClient
             icon: Assets.imagesOnlineMsgIcon,
             text: '当前在线',
             showDivider: false,
+            isSelected: conversationController.filterType.value == FilterType.online,
             onTap: () {
               Navigator.pop(context);
-              // TODO: 实现按在线状态筛选
+              // 如果已选中，则取消筛选；否则设置筛选
+              if (conversationController.filterType.value == FilterType.online) {
+                conversationController.setFilterType(FilterType.none);
+              } else {
+                conversationController.setFilterType(FilterType.online);
+              }
             },
           ),
         ),
@@ -198,6 +218,7 @@ class _MessagePageState extends State<MessagePage> with AutomaticKeepAliveClient
     required String text,
     required bool showDivider,
     required VoidCallback onTap,
+    bool isSelected = false,
   }) {
     return InkWell(
       onTap: onTap,
@@ -206,6 +227,7 @@ class _MessagePageState extends State<MessagePage> with AutomaticKeepAliveClient
         children: [
           Container(
             padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 12),
+            color: isSelected ? Colors.blue.withOpacity(0.1) : Colors.transparent,
             child: Row(
               children: [
                 Image.asset(
@@ -214,13 +236,22 @@ class _MessagePageState extends State<MessagePage> with AutomaticKeepAliveClient
                   height: 20,
                 ),
                 const SizedBox(width: 12),
-                Text(
-                  text,
-                  style: const TextStyle(
-                    fontSize: 14,
-                    color: Colors.black,
+                Expanded(
+                  child: Text(
+                    text,
+                    style: TextStyle(
+                      fontSize: 14,
+                      color: isSelected ? Colors.blue : Colors.black,
+                      fontWeight: isSelected ? FontWeight.w600 : FontWeight.normal,
+                    ),
                   ),
                 ),
+                if (isSelected)
+                  const Icon(
+                    Icons.check,
+                    size: 18,
+                    color: Colors.blue,
+                  ),
               ],
             ),
           ),