diff --git a/mcp_docx_server.py b/mcp_docx_server.py
index f6b52f8..6a8e43f 100644
--- a/mcp_docx_server.py
+++ b/mcp_docx_server.py
@@ -261,18 +261,19 @@ async def edit_docx(input_docx_path: str, replacements: Optional[List[Dict[str,
             img_pairs.append((idx, local_img))
 
         # 复用原始处理函数
+        output_docx = local_input.replace(".docx", "_output.docx")
         process(
             input_docx=local_input,
-            output_docx=local_input,
+            output_docx=output_docx,
             replacements=rep_pairs,
             image_replacements=img_pairs,
             color_keywords=color_keywords,
         )
 
-        abs_out = os.path.abspath(local_input)
+        abs_out = os.path.abspath(output_docx)
         return {
-            "output_path": abs_out,
-            "output_url": _build_output_url(abs_out),
+            "output_path": output_docx,
+            "output_url": _build_output_url(output_docx),
         }
     finally:
         if tmp_input and os.path.exists(tmp_input):