diff --git a/internal/service/task.go b/internal/service/task.go
index 4e42bb7..04c08e7 100644
--- a/internal/service/task.go
+++ b/internal/service/task.go
@@ -3,10 +3,10 @@ package service
 import (
 	"bytes"
 	"context"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
-	"mime/multipart"
 	"net/http"
 	"strings"
 
@@ -151,19 +151,29 @@ func (svc *TaskService) ExportTask(ctx context.Context, req *task.ExportTaskRequ
 		return nil, "", errors.New("markdown not found")
 	}
 
-	// call http://localhost:8055/export
-	body := &bytes.Buffer{}
-	writer := multipart.NewWriter(body)
-	_ = writer.WriteField("markdown_input", markdown)
-	_ = writer.WriteField("type", req.Type)
-	writer.Close()
+	// 获取文件名（去掉扩展名）
+	filename := strings.TrimSuffix(recognitionTask.FileName, "."+strings.ToLower(strings.Split(recognitionTask.FileName, ".")[len(strings.Split(recognitionTask.FileName, "."))-1]))
+	if filename == "" {
+		filename = "texpixel"
+	}
 
-	httpReq, err := http.NewRequestWithContext(ctx, http.MethodPost, "https://cloud.texpixel.com:10443/doc_converter/v1/export", body)
+	// 构建 JSON 请求体
+	requestBody := map[string]string{
+		"markdown": markdown,
+		"filename": filename,
+	}
+	jsonData, err := json.Marshal(requestBody)
+	if err != nil {
+		log.Error(ctx, "func", "ExportTask", "msg", "json marshal failed", "error", err)
+		return nil, "", err
+	}
+
+	httpReq, err := http.NewRequestWithContext(ctx, http.MethodPost, "https://cloud.texpixel.com:10443/doc_process/v1/convert/file", bytes.NewReader(jsonData))
 	if err != nil {
 		log.Error(ctx, "func", "ExportTask", "msg", "create http request failed", "error", err)
 		return nil, "", err
 	}
-	httpReq.Header.Set("Content-Type", writer.FormDataContentType())
+	httpReq.Header.Set("Content-Type", "application/json")
 
 	client := &http.Client{}
 	resp, err := client.Do(httpReq)
@@ -184,16 +194,8 @@ func (svc *TaskService) ExportTask(ctx context.Context, req *task.ExportTaskRequ
 		return nil, "", err
 	}
 
-	// determine content type based on export type
-	var contentType string
-	switch req.Type {
-	case "pdf":
-		contentType = "application/pdf"
-	case "docx":
-		contentType = "application/vnd.openxmlformats-officedocument.wordprocessingml.document"
-	default:
-		contentType = "application/octet-stream"
-	}
+	// 新接口只返回 DOCX 格式
+	contentType := "application/vnd.openxmlformats-officedocument.wordprocessingml.document"
 
 	return fileData, contentType, nil
 }