diff --git a/src/views/dialogue/components/DialogueSession.vue b/src/views/dialogue/components/DialogueSession.vue
index f42c1c27a90c69a374a9237714104ab8e7349645..8907f9333035f83d44328ba45e64640813abd066 100644
--- a/src/views/dialogue/components/DialogueSession.vue
+++ b/src/views/dialogue/components/DialogueSession.vue
@@ -254,8 +254,23 @@ const openDocumentPreview = (fileList: Array<any>, markId: string) => {
     });
     
     previewFileList.value = formattedList;
-    // 默认选中第一个文件
-    selectedPreviewFile.value = formattedList[0];
+    
+    // 🔑 修复：根据点击的标识索引选择对应的文件
+    // 从 DOM 元素中获取 data-mark-index 属性
+    const clickedElement = document.getElementById(markId);
+    let targetIndex = 0; // 默认第一个
+    
+    if (clickedElement) {
+      const markIndex = clickedElement.getAttribute('data-mark-index');
+      if (markIndex !== null) {
+        const index = parseInt(markIndex, 10);
+        if (!isNaN(index) && index >= 0 && index < formattedList.length) {
+          targetIndex = index;
+        }
+      }
+    }
+    
+    selectedPreviewFile.value = formattedList[targetIndex];
   } else {
     previewFileList.value = [];
     selectedPreviewFile.value = null;
diff --git a/src/views/dialogue/components/DocumentPreview.vue b/src/views/dialogue/components/DocumentPreview.vue
index c67b3c645fdf32bf5a96759a82258ede4ca9011a..4d4d0ba306f93d2c8eaf52d11fd3155765cd21f0 100644
--- a/src/views/dialogue/components/DocumentPreview.vue
+++ b/src/views/dialogue/components/DocumentPreview.vue
@@ -113,6 +113,7 @@ const tableData = ref<Array<Array<string>>>([]);
 const currentBlobUrl = ref<string>(''); // 追踪当前的Blob URL以便清理
 const pdfKey = ref(0); // 用于强制PDF重新渲染
 const containerWidth = ref(0); // 容器宽度
+let loadingSequence = 0; // 用于处理异步加载的竞态条件
 
 // PDF和图片的控制状态
 const currentPage = ref(1); // PDF当前页码
@@ -144,6 +145,9 @@ const loadPreview = async () => {
     return;
   }
 
+  // 🔑 修复：增加序列号处理异步竞态条件
+  const currentSequence = ++loadingSequence;
+
   // 清理之前的Blob URL
   if (currentBlobUrl.value) {
     URL.revokeObjectURL(currentBlobUrl.value);
@@ -162,6 +166,7 @@ const loadPreview = async () => {
   scale.value = 1;
   showSidebar.value = false;
   loadedPages.value = 10; // 重置为初始加载页数
+  pdfKey.value++; // 强制重新渲染PDF组件
 
   try {
     const fileType = props.file.documentType.toLowerCase();
@@ -169,69 +174,100 @@ const loadPreview = async () => {
     // 使用统一的API接口下载文档
     const blob = await downloadDocument(props.file.documentId);
     
+    // 🔑 检查是否是最新的加载请求
+    if (currentSequence !== loadingSequence) {
+      // 如果不是最新的请求，放弃处理
+      console.log('🔑 检测到文件切换，放弃旧的加载请求');
+      return;
+    }
+    
     // 图片类型 - 转换为Blob URL
     if (['jpg', 'jpeg', 'png', 'gif', 'webp'].includes(fileType)) {
       const blobUrl = URL.createObjectURL(blob);
-      currentBlobUrl.value = blobUrl;
-      previewContent.value = blobUrl;
+      if (currentSequence === loadingSequence) {
+        currentBlobUrl.value = blobUrl;
+        previewContent.value = blobUrl;
+      }
       return;
     }
 
     // PDF类型 - 转换为Blob URL
     if (fileType === 'pdf') {
       const blobUrl = URL.createObjectURL(blob);
-      currentBlobUrl.value = blobUrl;
-      previewContent.value = blobUrl;
+      if (currentSequence === loadingSequence) {
+        currentBlobUrl.value = blobUrl;
+        previewContent.value = blobUrl;
+      }
       return;
     }
 
     // 文本类型 - 直接读取为文本
     if (['txt', 'json', 'yaml', 'csv', 'html'].includes(fileType)) {
       const text = await blob.text();
-      previewContent.value = text;
+      if (currentSequence === loadingSequence) {
+        previewContent.value = text;
+      }
       return;
     }
 
     // Markdown类型
     if (fileType === 'md' || fileType === 'md.zip') {
       const text = await blob.text();
-      htmlContent.value = marked.parse(text) as string;
+      if (currentSequence === loadingSequence) {
+        htmlContent.value = marked.parse(text) as string;
+      }
       return;
     }
 
     // DOCX类型
     if (fileType === 'docx' || fileType === 'doc') {
       const arrayBuffer = await blob.arrayBuffer();
+      if (currentSequence !== loadingSequence) return;
+      
       const result = await mammoth.convertToHtml({ arrayBuffer });
-      htmlContent.value = result.value;
+      if (currentSequence === loadingSequence) {
+        htmlContent.value = result.value;
+      }
       return;
     }
 
     // Excel类型
     if (fileType === 'xlsx' || fileType === 'csv') {
       const arrayBuffer = await blob.arrayBuffer();
+      if (currentSequence !== loadingSequence) return;
+      
       const workbook = XLSX.read(arrayBuffer, { type: 'array' });
       const firstSheetName = workbook.SheetNames[0];
       const worksheet = workbook.Sheets[firstSheetName];
       const data = XLSX.utils.sheet_to_json(worksheet, { header: 1 }) as Array<Array<string>>;
-      tableData.value = data;
+      if (currentSequence === loadingSequence) {
+        tableData.value = data;
+      }
       return;
     }
 
     // PPTX类型 - 暂不支持在线预览
     if (fileType === 'pptx') {
-      previewError.value = `PPTX 格式暂不支持在线预览，请下载后查看`;
+      if (currentSequence === loadingSequence) {
+        previewError.value = `PPTX 格式暂不支持在线预览，请下载后查看`;
+      }
       return;
     }
 
     // 其他类型暂不支持在线预览
-    previewContent.value = '';
-    previewError.value = `暂不支持 ${fileType.toUpperCase()} 格式的在线预览，请下载后查看`;
+    if (currentSequence === loadingSequence) {
+      previewContent.value = '';
+      previewError.value = `暂不支持 ${fileType.toUpperCase()} 格式的在线预览，请下载后查看`;
+    }
   } catch (error) {
     console.error('加载预览失败:', error);
-    previewError.value = `加载预览失败: ${error instanceof Error ? error.message : '未知错误'}`;
+    if (currentSequence === loadingSequence) {
+      previewError.value = `加载预览失败: ${error instanceof Error ? error.message : '未知错误'}`;
+    }
   } finally {
-    loading.value = false;
+    if (currentSequence === loadingSequence) {
+      loading.value = false;
+    }
   }
 };