diff --git a/remote_sync/skills/dingtalk-excel-image-return/scripts/convert_excel_image_links.py b/remote_sync/skills/dingtalk-excel-image-return/scripts/convert_excel_image_links.py
index 2cf9b6e..18743da 100755
--- a/remote_sync/skills/dingtalk-excel-image-return/scripts/convert_excel_image_links.py
+++ b/remote_sync/skills/dingtalk-excel-image-return/scripts/convert_excel_image_links.py
@@ -2,9 +2,9 @@
 from __future__ import annotations
 
 import argparse
-import io
 import re
 import ssl
+import tempfile
 import urllib.error
 import urllib.parse
 import urllib.request
@@ -251,7 +251,7 @@ def resize_image(image: XLImage, max_width: int, max_height: int) -> None:
     image.height = int(height * scale)
 
 
-def process_sheet(sheet, args: argparse.Namespace, ssl_context) -> list[RowResult]:
+def process_sheet(sheet, args: argparse.Namespace, ssl_context, temp_files: list[Path]) -> list[RowResult]:
     results: list[RowResult] = []
 
     header_row = args.header_row
@@ -282,9 +282,12 @@ def process_sheet(sheet, args: argparse.Namespace, ssl_context) -> list[RowResul
 
         try:
             payload, extension = download_image(url, args.timeout, ssl_context)
-            image_buffer = io.BytesIO(payload)
-            image_buffer.name = f"row_{row}{extension}"
-            image = XLImage(image_buffer)
+            with tempfile.NamedTemporaryFile(delete=False, suffix=extension) as temp_file:
+                temp_file.write(payload)
+                temp_path = Path(temp_file.name)
+            temp_files.append(temp_path)
+
+            image = XLImage(str(temp_path))
             resize_image(image, args.max_width, args.max_height)
 
             anchor = f"{image_column_letter}{row}"
@@ -321,14 +324,19 @@ def main() -> int:
 
     workbook = load_workbook(input_path)
     sheets = choose_sheets(workbook, args.sheet)
+    temp_files: list[Path] = []
 
     all_results: list[tuple[str, RowResult]] = []
     for sheet in sheets:
-        sheet_results = process_sheet(sheet, args, ssl_context)
+        sheet_results = process_sheet(sheet, args, ssl_context, temp_files)
         all_results.extend((sheet.title, item) for item in sheet_results)
 
     output_path.parent.mkdir(parents=True, exist_ok=True)
-    workbook.save(output_path)
+    try:
+        workbook.save(output_path)
+    finally:
+        for file_path in temp_files:
+            file_path.unlink(missing_ok=True)
 
     success_count = sum(1 for _, item in all_results if item.status == "ok")
     fail_count = sum(1 for _, item in all_results if item.status == "failed")