diff --git a/.github/workflows/pr-chatbot-review.yml b/.github/workflows/pr-chatbot-review.yml
new file mode 100644
index 00000000..33fdc220
--- /dev/null
+++ b/.github/workflows/pr-chatbot-review.yml
@@ -0,0 +1,91 @@
+name: PR Review Bot
+
+on:
+  pull_request:
+    types: [opened, synchronize]
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  review:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Get PR diff
+        id: diff
+        run: |
+          git fetch origin ${{ github.event.pull_request.base.sha }}
+          DIFF=$(git diff ${{ github.event.pull_request.base.sha }} ${{ github.event.pull_request.head.sha }})
+          echo "DIFF<<EOF" >> $GITHUB_ENV
+          echo "$DIFF" >> $GITHUB_ENV
+          echo "EOF" >> $GITHUB_ENV
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+
+      - name: Install pnpm
+        uses: pnpm/action-setup@v2
+        with:
+          version: 9
+          run_install: false
+
+      - name: Install OpenAI SDK
+        run: |
+          pnpm config set registry https://registry.npmmirror.com/
+          pnpm add openai
+
+      - name: Analyze PR
+        id: analyze
+        uses: actions/github-script@v7
+        env:
+          DASHSCOPE_API_KEY: ${{ secrets.DASHSCOPE_API_KEY }}
+        with:
+          script: |
+            const OpenAI = require('openai');
+            
+            const openai = new OpenAI({
+              apiKey: process.env.DASHSCOPE_API_KEY,
+              baseURL: "https://dashscope.aliyuncs.com/compatible-mode/v1"
+            });
+            
+            const diff = process.env.DIFF;
+            
+            try {
+              const completion = await openai.chat.completions.create({
+                model: "qwen-plus",
+                messages: [{
+                  role: "system",
+                  content: "你是一个代码审查助手，请用中文分析以下代码变更。"
+                }, {
+                  role: "user",
+                  content: `请分析以下代码变更并总结主要改动：\n\n${diff}`
+                }],
+                temperature: 0.7,
+                max_tokens: 1000
+              });
+              
+              const analysis = completion.choices[0].message.content;
+              core.setOutput('analysis', analysis);
+              
+              await github.rest.issues.createComment({
+                issue_number: context.issue.number,
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                body: `## PR 代码分析
+
+                ${analysis}
+
+                ---
+                *这是由通义千问 AI 自动生成的 PR 分析，仅供参考。*`
+              });
+            } catch (error) {
+              core.setFailed(`分析失败: ${error.message}`);
+            } 
\ No newline at end of file
diff --git a/src/components/common/VirtualList.vue b/src/components/common/VirtualList.vue
index aaf1bee4..a720fdac 100644
--- a/src/components/common/VirtualList.vue
+++ b/src/components/common/VirtualList.vue
@@ -1,5 +1,9 @@
 <template>
   <div ref="containerRef" class="virtual-list-container" @scroll="handleScroll">
+    <n-flex v-if="isLoadingMore" justify="center" class="box-border absolute-x-center pt-10px">
+      <img class="size-16px" src="@/assets/img/loading.svg" alt="" />
+      <span class="text-(14px #909090)">加载中</span>
+    </n-flex>
     <div class="virtual-list-phantom" :style="{ height: `${totalHeight}px` }"></div>
     <div class="virtual-list-content" :style="{ transform: `translateY(${offset}px)` }">
       <div v-for="item in visibleData" :key="item.message?.id" :id="`item-${item.message?.id}`">
@@ -14,6 +18,7 @@ const props = defineProps<{
   items: any[]
   estimatedItemHeight?: number
   buffer?: number
+  isLoadingMore?: boolean
 }>()
 
 const emit = defineEmits<{
@@ -25,8 +30,9 @@ const emit = defineEmits<{
 const DEFAULT_ESTIMATED_HEIGHT = 80 // 默认预估的每项高度
 const BUFFER_SIZE = props.buffer || 5 // 上下缓冲区域的数量
 const OVERSCAN_SIZE = 1000 // 预渲染区域的像素高度，防止滚动时出现空白
-const estimatedItemHeight = props.estimatedItemHeight || DEFAULT_ESTIMATED_HEIGHT // 每项的预估高度
 const MAX_CACHE_SIZE = 1000 // 高度缓存的最大数量
+const LOADING_OFFSET = 26 // 加载中需要的偏移量(26px是加载动画的高度)
+const ESTIMATED_ITEM_HEIGHT = props.estimatedItemHeight || DEFAULT_ESTIMATED_HEIGHT // 每项的预估高度
 
 // 响应式引用
 const containerRef = ref<HTMLElement | null>(null) // 容器元素引用
@@ -78,7 +84,7 @@ const visibleData = computed(() => {
 const totalHeight = computed(() => {
   // 累加所有项目的高度，如果没有缓存则使用预估高度
   return props.items.reduce((total, item) => {
-    return total + (heights.value.get(item.message?.id?.toString()) || estimatedItemHeight)
+    return total + (heights.value.get(item.message?.id?.toString()) || ESTIMATED_ITEM_HEIGHT)
   }, 0)
 })
 
@@ -127,18 +133,29 @@ const updateItemHeight = () => {
 
 // 根据滚动位置计算起始索引
 const getStartIndex = (scrollTop: number) => {
-  let total = 0
-  let index = 0
+  const accumulatedHeights: number[] = []
+  let totalHeight = 0
+  // 预计算累积高度 O(n)，但只需要在列表数据变化时更新
+  props.items.forEach((item, index) => {
+    totalHeight += heights.value.get(item.message?.id?.toString()) || ESTIMATED_ITEM_HEIGHT
+    accumulatedHeights[index] = totalHeight
+  })
 
-  // 累加高度直到超过当前滚动位置减去预渲染区域
-  while (total < scrollTop - OVERSCAN_SIZE && index < props.items.length) {
-    const itemHeight = heights.value.get(props.items[index].message?.id?.toString()) || estimatedItemHeight
-    total += itemHeight
-    index++
+  // 二分查找 O(log n)
+  let left = 0
+  let right = accumulatedHeights.length - 1
+  const target = scrollTop - OVERSCAN_SIZE
+
+  while (left <= right) {
+    const mid = Math.floor((left + right) / 2)
+    if (accumulatedHeights[mid] < target) {
+      left = mid + 1
+    } else {
+      right = mid - 1
+    }
   }
 
-  // 返回计算后的索引，确保留有缓冲区
-  return Math.max(0, index - BUFFER_SIZE)
+  return Math.max(0, left - BUFFER_SIZE)
 }
 
 // 计算指定索引的偏移量
@@ -146,7 +163,7 @@ const getOffsetForIndex = (index: number) => {
   let total = 0
   // 累加到目标索引前的所有项目高度
   for (let i = 0; i < index; i++) {
-    const itemHeight = heights.value.get(props.items[i].message?.id?.toString()) || estimatedItemHeight
+    const itemHeight = heights.value.get(props.items[i].message?.id?.toString()) || ESTIMATED_ITEM_HEIGHT
     total += itemHeight
   }
   return total
@@ -166,7 +183,7 @@ const updateVisibleRange = () => {
 
   // 累加高度直到超过可视区域加上预渲染区域
   while (total < clientHeight + OVERSCAN_SIZE * 2 && end < props.items.length) {
-    const itemHeight = heights.value.get(props.items[end].message?.id?.toString()) || estimatedItemHeight
+    const itemHeight = heights.value.get(props.items[end].message?.id?.toString()) || ESTIMATED_ITEM_HEIGHT
     total += itemHeight
     end++
   }
@@ -176,7 +193,8 @@ const updateVisibleRange = () => {
 
   // 更新可见范围和偏移量
   visibleRange.value = { start, end }
-  offset.value = getOffsetForIndex(start)
+  // 加上加载中需要的偏移量
+  offset.value = getOffsetForIndex(start) + LOADING_OFFSET
 }
 
 // 更新可见范围的帧动画处理
diff --git a/src/components/rightBox/chatBox/ChatMain.vue b/src/components/rightBox/chatBox/ChatMain.vue
index b588ac4a..57241cab 100644
--- a/src/components/rightBox/chatBox/ChatMain.vue
+++ b/src/components/rightBox/chatBox/ChatMain.vue
@@ -9,12 +9,6 @@
     当前网络不可用，请检查你的网络设置
   </n-flex>
 
-  <!-- 加载中提示 -->
-  <n-flex justify="center" class="box-border pt-10px" v-if="messageOptions?.isLoading && isLoadingMore">
-    <img class="size-16px" src="@/assets/img/loading.svg" alt="" />
-    <span class="text-(14px #909090)">加载中</span>
-  </n-flex>
-
   <Transition name="chat-init" appear mode="out-in" @after-leave="handleTransitionComplete">
     <!-- 初次加载的骨架屏 -->
     <n-flex
@@ -50,11 +44,12 @@
       id="image-chat-main"
       ref="virtualListInst"
       :items="chatMessageList"
-      :estimated-item-height="itemSize"
+      :estimatedItemHeight="itemSize"
       :buffer="5"
+      :isLoadingMore="messageOptions?.isLoading && isLoadingMore"
       @scroll="handleScroll"
       @scroll-direction-change="handleScrollDirectionChange"
-      :style="{ maxHeight: `calc(100vh - ${messageOptions?.isLoading && isLoadingMore ? '286px' : '260px'})` }">
+      style="max-height: calc(100vh - 260px)">
       <template #default="{ item, index }">
         <n-flex
           vertical
@@ -491,7 +486,7 @@ watch(
 
       // 如果正在加载历史消息，优先处理历史消息的滚动
       if (isLoadingMore.value) {
-        if (scrollTop.value < 10) {
+        if (scrollTop.value < 26) {
           requestAnimationFrame(() => {
             virtualListInst.value?.scrollTo({ index: value.length - oldValue.length })
           })
@@ -541,13 +536,13 @@ const handleScroll = () => {
   const scrollHeight = container.scrollHeight
   // 获取容器的可视区域高度
   const clientHeight = container.clientHeight
-  // 计算距离底部的距离
+  // ��算距离底部的距离
   const distanceFromBottom = scrollHeight - scrollTop.value - clientHeight
 
   // 存储 requestAnimationFrame 的返回值
   rafId.value = requestAnimationFrame(async () => {
     // 处理触顶加载更多
-    if (scrollTop.value === 0) {
+    if (scrollTop.value < 26) {
       // 如果正在加载或已经触发了加载，则不重复触发
       if (messageOptions.value?.isLoading || isLoadingMore.value) return
 
@@ -742,7 +737,7 @@ const canReEdit = computed(() => (msgId: number) => {
   const message = chatStore.getMessage(msgId)
   if (!recalledMsg || !message) return false
 
-  // 只需要判断是否是当前用户的消息，时间检查已经在 getRecalledMessage 中处理
+  // 只需要判断是否是当前用户的消��，时间检查已经在 getRecalledMessage 中处理
   return message.fromUser.uid === userUid.value
 })
 
diff --git a/src/typings/components.d.ts b/src/typings/components.d.ts
index a658e3ef..ff8e9af0 100644
--- a/src/typings/components.d.ts
+++ b/src/typings/components.d.ts
@@ -43,6 +43,7 @@ declare module 'vue' {
     NIconWrapper: typeof import('naive-ui')['NIconWrapper']
     NImage: typeof import('naive-ui')['NImage']
     NImageGroup: typeof import('naive-ui')['NImageGroup']
+    NInfiniteScroll: typeof import('naive-ui')['NInfiniteScroll']
     NInput: typeof import('naive-ui')['NInput']
     NLoadingBarProvider: typeof import('naive-ui')['NLoadingBarProvider']
     NMessageProvider: typeof import('naive-ui')['NMessageProvider']
@@ -58,6 +59,7 @@ declare module 'vue' {
     NScrollbar: typeof import('naive-ui')['NScrollbar']
     NSelect: typeof import('naive-ui')['NSelect']
     NSkeleton: typeof import('naive-ui')['NSkeleton']
+    NSpace: typeof import('naive-ui')['NSpace']
     NSpin: typeof import('naive-ui')['NSpin']
     NSwitch: typeof import('naive-ui')['NSwitch']
     NTab: typeof import('naive-ui')['NTab']