diff --git a/app/api/files/files-upload.ts b/app/api/files/files-upload.ts
index c8160a1..75d5ed8 100644
--- a/app/api/files/files-upload.ts
+++ b/app/api/files/files-upload.ts
@@ -310,7 +310,8 @@ export async function uploadDocumentToServer(
   isTestDocument: boolean = false,
   documentId?: number | null,
   isReupload: boolean = false,
-  jwtToken?: string
+  jwtToken?: string,
+  attachments?: File[]
 ): Promise<{data: FileUploadResponse; error?: never} | {data?: never; error: string; status?: number}> {
   try {
     // console.log('【调试】开始上传文档:', { fileName, fileSize: binaryData.byteLength });
@@ -337,9 +338,18 @@ export async function uploadDocumentToServer(
     // 添加JSON字符串到FormData
     formData.append('upload_info', JSON.stringify(uploadInfo));
     // console.log('【调试】FormData准备完成:', JSON.stringify(uploadInfo));
+
+    // 如果提供了附件（仅当后端支持首传合并时使用），按照后端规范追加到 FormData
+    if (attachments && attachments.length > 0) {
+      attachments.forEach(att => {
+        formData.append('attachments', att);
+      });
+    }
     
     // 根据是否有documentId决定使用哪个接口
-    const uploadEndpoint = documentId ? '/upload_contract_template' : '/upload';
+    // 首传合并：无论是否有附件，都应走 /upload；
+    // 仅当要上传“合同模板”时，使用独立的 uploadContractTemplate 接口（不在本函数中处理）。
+    const uploadEndpoint = '/upload';
     const uploadUrl = UPLOAD_URL + uploadEndpoint;
     // console.log('【调试】准备发送请求到服务器:', uploadUrl);
     
diff --git a/app/routes/files.upload.tsx b/app/routes/files.upload.tsx
index 3daf344..6d7ec6f 100644
--- a/app/routes/files.upload.tsx
+++ b/app/routes/files.upload.tsx
@@ -126,7 +126,8 @@ async function handleFileUpload(
   isTestDocument: boolean,
   documentId?: number | null,
   isReupload: boolean = false,
-  jwtToken?: string
+  jwtToken?: string,
+  attachments?: File[]
 ): Promise<FileUploadResponse> {
   const response = await uploadDocumentToServer(
     binaryData,
@@ -139,7 +140,8 @@ async function handleFileUpload(
     isTestDocument,
     documentId,
     isReupload,
-    jwtToken
+    jwtToken,
+    attachments
   );
   
   if (response.error || !response.data) {
@@ -1016,6 +1018,61 @@ export default function FilesUpload() {
     }
   };
   
+  // 合同专用：首传即合并的上传链路
+  const startContractUpload = async (mainFiles: File[], attachmentFiles: File[], templateFiles: File[] = []) => {
+    try {
+      // 只允许一个主文件
+      const mainFile = mainFiles[0];
+      setUploadStage("uploading");
+      setUploadProgress(0);
+
+      // 转二进制
+      const binaryData = await uploadFileToBinary(mainFile);
+
+      // 首传：将附件通过 attachments 一起带上
+      const uploadResp = await handleFileUpload(
+        binaryData,
+        mainFile.name,
+        mainFile.type,
+        fileType as FileType,
+        priority,
+        documentNumber || null,
+        remark || null,
+        isTestDocument,
+        null,
+        false,
+        loaderData.frontendJWT || undefined,
+        attachmentFiles
+      );
+
+      if (!uploadResp.result) throw new Error('主文件上传失败');
+      const documentId = uploadResp.result.id;
+
+      // 可选：模板上传
+      if (templateFiles && templateFiles.length > 0) {
+        const tpl = templateFiles[0];
+        const tplResult = await uploadContractTemplate(
+          tpl,
+          documentId,
+          undefined,
+          loaderData.frontendJWT as string | undefined
+        );
+        if ('error' in tplResult && tplResult.error) {
+          throw new Error(tplResult.error);
+        }
+      }
+
+      toastService.success('上传成功，已触发处理');
+      // 刷新队列
+      await filterDocuments(reviewType);
+      setUploadStage("processing");
+    } catch (error) {
+      console.error('合同首传上传失败:', error);
+      messageService.error(`合同上传失败：${error instanceof Error ? error.message : '未知错误'}`);
+      setUploadStage("idle");
+    }
+  };
+
   // 检查并准备上传
   const checkAndPrepareUpload = (mainFiles: File[], attachmentFiles: File[], templateFiles: File[] = []) => {
     try {
@@ -1050,42 +1107,18 @@ export default function FilesUpload() {
       // });
       
       if (isContract) {
-        // console.log('【调试-checkAndPrepareUpload】合同文档类型特殊处理');
-        
-        // 检查主文件
+        // 合同类型：走首传即合并的专用链路
         if(mainFiles.length === 0) {
-          console.error('【调试-checkAndPrepareUpload】缺少合同主文件');
           toastService.error('请上传合同主文件');
           return;
         }
-        
-        // 记录主文件、附件文件和模板文件信息
-        console.log('【调试-checkAndPrepareUpload】合同主文件:', mainFiles.map(f => ({ name: f.name, size: f.size, type: f.type })));
-        if (attachmentFiles.length > 0) {
-          console.log('【调试-checkAndPrepareUpload】合同附件文件:', attachmentFiles.map(f => ({ name: f.name, size: f.size, type: f.type })));
-        } else {
-          console.log('【调试-checkAndPrepareUpload】无合同附件文件');
-        }
-        if (templateFiles.length > 0) {
-          console.log('【调试-checkAndPrepareUpload】合同模板文件:', templateFiles.map(f => ({ name: f.name, size: f.size, type: f.type })));
-        } else {
-          console.log('【调试-checkAndPrepareUpload】无合同模板文件');
-        }
+        startContractUpload(mainFiles, attachmentFiles, templateFiles);
+        return;
       }
       
       if (mainFiles.length > 0) {
         // 合并所有文件
         let allFiles = [...mainFiles];
-        
-        // 如果附件文件存在，则合并
-        if (attachmentFiles.length > 0) {
-          allFiles = [...allFiles, ...attachmentFiles];
-        }
-        
-        // 如果模板文件存在，则合并
-        if (templateFiles.length > 0) {
-          allFiles = [...allFiles, ...templateFiles];
-        }
 
         // console.log('【调试-checkAndPrepareUpload】合并文件后总数:', allFiles.length);