diff --git a/server/imserver/chatmgr.cc b/server/imserver/chatmgr.cc
index 74ab987..ec22db2 100644
--- a/server/imserver/chatmgr.cc
+++ b/server/imserver/chatmgr.cc
@@ -32,8 +32,14 @@ void ChatMgr::FillSMUpdateChatRedPointNotify(Player* hum, cs::SMUpdateChatRedPoi
         }
     }
     ChatedUserRec* chated_user = GetChatedUser(hum->AccountId());
-    if (chated_user && chated_user->has_unread_msg) {
-        msg.add_has_unread_msg_channels(kCCPrivate);
+    if (chated_user) {
+        if (chated_user->dirty) {
+            chated_user->has_unread_msg = false;
+            chated_user->dirty = false;
+        }
+        if (chated_user->has_unread_msg) {
+            msg.add_has_unread_msg_channels(kCCPrivate);
+        }
     }
 }
 
@@ -251,6 +257,7 @@ void ChatMgr::SyncPrivateChatMsg(Player* hum)
                     if (chat_msg->msg_uuid() > itr->second.curr_id) {
                         *notifymsg.add_msg_list() = *chat_msg;
                         itr->second.curr_id = chat_msg->msg_uuid();
+                        chated_user->dirty = true;
                     }
                 }
             }
@@ -295,6 +302,7 @@ void ChatMgr::AddChatedUser(const std::string& sender_id, const std::string& rec
         private_chated_users_[sender_id] = ChatedUserRec();
         itr = private_chated_users_.find(sender_id);
     }
+    itr->second.dirty = false;
     itr->second.has_unread_msg = true;
     auto itr2 = itr->second.users.find(receiver_id);
     if (itr2 == itr->second.users.end()) {
diff --git a/server/imserver/chatmgr.h b/server/imserver/chatmgr.h
index bdea0c8..5649ef1 100644
--- a/server/imserver/chatmgr.h
+++ b/server/imserver/chatmgr.h
@@ -30,6 +30,7 @@ struct ChatMsgRec
 struct ChatedUserRec
 {
     bool has_unread_msg = false;
+    bool dirty = false;
     std::map<std::string, ChatMsgRec> users;
 };