diff --git a/shared/redux/slices/chat.ts b/shared/redux/slices/chat.ts
index 488eb3ab..613fe4f4 100644
--- a/shared/redux/slices/chat.ts
+++ b/shared/redux/slices/chat.ts
@@ -15,7 +15,7 @@ interface ChatState {
   currentConverseId: string | null; // 当前活跃的会话id
   converses: Record<string, ChatConverseState>; // <会话Id, 会话信息>
   ack: Record<string, string>; // <会话Id, 本地最后一条会话Id>
-  lastMessageMap: Record<string, string>; // <会话Id, 远程最后一条会话Id>
+  lastMessageMap: Record<string, string>; // <会话Id, 远程会话列表最后一条会话Id>
 }
 
 const initialState: ChatState = {
diff --git a/web/src/components/ChatBox/useMessageAck.ts b/web/src/components/ChatBox/useMessageAck.ts
index 7789ebde..c47575a4 100644
--- a/web/src/components/ChatBox/useMessageAck.ts
+++ b/web/src/components/ChatBox/useMessageAck.ts
@@ -4,6 +4,7 @@ import {
   isValidStr,
   updateAck,
   useAppDispatch,
+  useAppSelector,
   useUpdateRef,
 } from 'tailchat-shared';
 import { chatActions } from 'tailchat-shared/redux/slices';
@@ -12,7 +13,11 @@ import _debounce from 'lodash/debounce';
 export function useMessageAck(converseId: string, messages: ChatMessage[]) {
   const messagesRef = useUpdateRef(messages);
   const dispatch = useAppDispatch();
+
   const lastMessageIdRef = useRef('');
+  lastMessageIdRef.current = useAppSelector(
+    (state) => state.chat.ack[converseId] ?? ''
+  );
 
   const setConverseAck = useMemo(
     () =>