diff --git a/electron/services/wcdbCore.ts b/electron/services/wcdbCore.ts
index a5167b3..d6124dd 100644
--- a/electron/services/wcdbCore.ts
+++ b/electron/services/wcdbCore.ts
@@ -155,63 +155,7 @@ export class WcdbCore {
     return this.startMonitor(callback)
   }
 
-  /**
-   * 获取指定时间之后的新消息（增量更新）
-   */
-  getNewMessages(sessionId: string, minTime: number, limit: number = 1000): { success: boolean; messages?: any[]; error?: string } {
-    if (!this.handle || !this.wcdbOpenMessageCursorLite || !this.wcdbFetchMessageBatch || !this.wcdbCloseMessageCursor) {
-      return { success: false, error: 'Database not handled or functions missing' }
-    }
 
-    // 1. Open Cursor
-    const cursorPtr = Buffer.alloc(8) // int64*
-    // wcdb_open_message_cursor_lite(handle, sessionId, batchSize, ascending, beginTime, endTime, outCursor)
-    // ascending=1 (ASC) to get messages AFTER minTime ordered by time
-    // beginTime = minTime + 1 (to avoid duplicate of the last message)
-    // Actually, let's use minTime, user logic might handle duplication or we just pass strictly greater
-    // C++ logic: create_time >= beginTimestamp. So if we want new messages, passing lastTimestamp + 1 is safer.
-    const openRes = this.wcdbOpenMessageCursorLite(this.handle, sessionId, limit, 1, minTime, 0, cursorPtr)
-
-    if (openRes !== 0) {
-      return { success: false, error: `Open cursor failed: ${openRes}` }
-    }
-
-    // Read int64 from buffer
-    const cursor = cursorPtr.readBigInt64LE(0)
-
-    // 2. Fetch Batch
-    const outJsonPtr = Buffer.alloc(8) // void**
-    const outHasMorePtr = Buffer.alloc(4) // int32*
-
-    // fetch_message_batch(handle, cursor, outJson, outHasMore)
-    const fetchRes = this.wcdbFetchMessageBatch(this.handle, cursor, outJsonPtr, outHasMorePtr)
-
-    let messages: any[] = []
-    if (fetchRes === 0) {
-      const jsonPtr = outJsonPtr.readBigInt64LE(0) // void* address
-      if (jsonPtr !== 0n) {
-        // koffi decode string
-        const jsonStr = this.koffi.decode(jsonPtr, 'string')
-        this.wcdbFreeString(jsonPtr) // Must free
-        if (jsonStr) {
-          try {
-            messages = JSON.parse(jsonStr)
-          } catch (e) {
-            console.error('Parse messages failed', e)
-          }
-        }
-      }
-    }
-
-    // 3. Close Cursor
-    this.wcdbCloseMessageCursor(this.handle, cursor)
-
-    if (fetchRes !== 0) {
-      return { success: false, error: `Fetch batch failed: ${fetchRes}` }
-    }
-
-    return { success: true, messages }
-  }
 
   /**
    * 获取 DLL 路径
@@ -999,6 +943,37 @@ export class WcdbCore {
     }
   }
 
+  /**
+   * 获取指定时间之后的新消息
+   */
+  async getNewMessages(sessionId: string, minTime: number, limit: number = 1000): Promise<{ success: boolean; messages?: any[]; error?: string }> {
+    if (!this.ensureReady()) {
+      return { success: false, error: 'WCDB 未连接' }
+    }
+    try {
+      // 1. 打开游标 (使用 Ascending=1 从指定时间往后查)
+      const openRes = await this.openMessageCursorLite(sessionId, limit, true, minTime, 0)
+      if (!openRes.success || !openRes.cursor) {
+        return { success: false, error: openRes.error }
+      }
+
+      const cursor = openRes.cursor
+      try {
+        // 2. 获取批次
+        const fetchRes = await this.fetchMessageBatch(cursor)
+        if (!fetchRes.success) {
+          return { success: false, error: fetchRes.error }
+        }
+        return { success: true, messages: fetchRes.rows }
+      } finally {
+        // 3. 关闭游标
+        await this.closeMessageCursor(cursor)
+      }
+    } catch (e) {
+      return { success: false, error: String(e) }
+    }
+  }
+
   async getMessageCount(sessionId: string): Promise<{ success: boolean; count?: number; error?: string }> {
     if (!this.ensureReady()) {
       return { success: false, error: 'WCDB 未连接' }
diff --git a/resources/wcdb_api.dll b/resources/wcdb_api.dll
index 8c4fb39..9d0741f 100644
Binary files a/resources/wcdb_api.dll and b/resources/wcdb_api.dll differ
diff --git a/src/pages/ChatPage.tsx b/src/pages/ChatPage.tsx
index a5c8b3d..f5e99e2 100644
--- a/src/pages/ChatPage.tsx
+++ b/src/pages/ChatPage.tsx
@@ -192,6 +192,7 @@ function ChatPage(_props: ChatPageProps) {
   const isLoadingMessagesRef = useRef(false)
   const isLoadingMoreRef = useRef(false)
   const isConnectedRef = useRef(false)
+  const isRefreshingRef = useRef(false)
   const searchKeywordRef = useRef('')
   const preloadImageKeysRef = useRef<Set<string>>(new Set())
   const lastPreloadSessionRef = useRef<string | null>(null)
@@ -320,6 +321,7 @@ function ChatPage(_props: ChatPageProps) {
           }
 
           setSessions(nextSessions)
+          sessionsRef.current = nextSessions
           // 立即启动联系人信息加载，不再延迟 500ms
           void enrichSessionsContactInfo(nextSessions)
         } else {
@@ -566,10 +568,13 @@ function ChatPage(_props: ChatPageProps) {
    * (由用户建议：记住上一条消息时间，自动取之后的并渲染，然后后台兜底全量同步)
    */
   const handleIncrementalRefresh = async () => {
-    if (!currentSessionId || isRefreshingMessages) return
+    if (!currentSessionId || isRefreshingRef.current) return
+    isRefreshingRef.current = true
+    setIsRefreshingMessages(true)
 
-    // 找出当前已渲染消息中的最大时间戳
-    const lastMsg = messages[messages.length - 1]
+    // 找出当前已渲染消息中的最大时间戳（使用 getState 获取最新状态，避免闭包过时导致重复）
+    const currentMessages = useChatStore.getState().messages
+    const lastMsg = currentMessages[currentMessages.length - 1]
     const minTime = lastMsg?.createTime || 0
 
     // 1. 优先执行增量查询并渲染（第一步）
@@ -581,8 +586,9 @@ function ChatPage(_props: ChatPageProps) {
       }
 
       if (result.success && result.messages && result.messages.length > 0) {
-        // 过滤去重
-        const existingKeys = new Set(messages.map(getMessageKey))
+        // 过滤去重：必须对比实时的状态，防止在 handleRefreshMessages 运行期间导致的冲突
+        const latestMessages = useChatStore.getState().messages
+        const existingKeys = new Set(latestMessages.map(getMessageKey))
         const newOnes = result.messages.filter(m => !existingKeys.has(getMessageKey(m)))
 
         if (newOnes.length > 0) {
@@ -598,18 +604,19 @@ function ChatPage(_props: ChatPageProps) {
       }
     } catch (e) {
       console.warn('[IncrementalRefresh] 失败，将依赖全量同步兜底:', e)
+    } finally {
+      isRefreshingRef.current = false
+      setIsRefreshingMessages(false)
     }
-
-    // 2. 后台兜底：执行之前的完整游标刷新，确保没有遗漏（比如跨库的消息）
-    void handleRefreshMessages()
   }
 
   const handleRefreshMessages = async () => {
-    if (!currentSessionId || isRefreshingMessages) return
+    if (!currentSessionId || isRefreshingRef.current) return
     setJumpStartTime(0)
     setJumpEndTime(0)
     setHasMoreLater(false)
     setIsRefreshingMessages(true)
+    isRefreshingRef.current = true
     try {
       // 获取最新消息并增量添加
       const result = await window.electronAPI.chat.getLatestMessages(currentSessionId, 50) as {
@@ -620,13 +627,17 @@ function ChatPage(_props: ChatPageProps) {
       if (!result.success || !result.messages) {
         return
       }
-      const existing = new Set(messages.map(getMessageKey))
-      const lastMsg = messages[messages.length - 1]
+      // 使用实时状态进行去重对比
+      const latestMessages = useChatStore.getState().messages
+      const existing = new Set(latestMessages.map(getMessageKey))
+      const lastMsg = latestMessages[latestMessages.length - 1]
       const lastTime = lastMsg?.createTime ?? 0
+
       const newMessages = result.messages.filter((msg) => {
         const key = getMessageKey(msg)
         if (existing.has(key)) return false
-        if (lastTime > 0 && msg.createTime < lastTime) return false
+        // 这里的 lastTime 仅作参考过滤，主要的去重靠 key
+        if (lastTime > 0 && msg.createTime < lastTime - 3600) return false // 仅过滤 1 小时之前的冗余请求
         return true
       })
       if (newMessages.length > 0) {
@@ -642,6 +653,7 @@ function ChatPage(_props: ChatPageProps) {
     } catch (e) {
       console.error('刷新消息失败:', e)
     } finally {
+      isRefreshingRef.current = false
       setIsRefreshingMessages(false)
     }
   }
diff --git a/src/stores/chatStore.ts b/src/stores/chatStore.ts
index 561f568..0e166c9 100644
--- a/src/stores/chatStore.ts
+++ b/src/stores/chatStore.ts
@@ -80,11 +80,23 @@ export const useChatStore = create<ChatState>((set, get) => ({
 
   setMessages: (messages) => set({ messages }),
 
-  appendMessages: (newMessages, prepend = false) => set((state) => ({
-    messages: prepend
-      ? [...newMessages, ...state.messages]
-      : [...state.messages, ...newMessages]
-  })),
+  appendMessages: (newMessages, prepend = false) => set((state) => {
+    // 强制去重逻辑
+    const getMsgKey = (m: Message) => {
+      if (m.localId && m.localId > 0) return `l:${m.localId}`
+      return `t:${m.createTime}:${m.sortSeq || 0}:${m.serverId || 0}`
+    }
+    const existingKeys = new Set(state.messages.map(getMsgKey))
+    const filtered = newMessages.filter(m => !existingKeys.has(getMsgKey(m)))
+
+    if (filtered.length === 0) return state
+
+    return {
+      messages: prepend
+        ? [...filtered, ...state.messages]
+        : [...state.messages, ...filtered]
+    }
+  }),
 
   setLoadingMessages: (loading) => set({ isLoadingMessages: loading }),
   setLoadingMore: (loading) => set({ isLoadingMore: loading }),