diff --git a/post_pro/merge_tif.py b/post_pro/merge_tif.py
index dc2f48f..866eae6 100644
--- a/post_pro/merge_tif.py
+++ b/post_pro/merge_tif.py
@@ -108,6 +108,7 @@ class MergeTif:
 
         input_tif1, input_tif2 = None, None
         merge_count = 0
+        temp_files = []
 
         try:
             for grid_id, points in grid_points.items():
@@ -127,8 +128,8 @@ class MergeTif:
                 # 如果文件大于600MB，则不使用original文件
                 file_size_mb = os.path.getsize(
                     grid_tif) / (1024 * 1024)  # 转换为MB
-                file_name = file_name.replace(".original", "")
                 if file_size_mb > 600:
+                    file_name = file_name.replace(".original", "")
                     grid_tif = os.path.join(
                         self.output_dir,
                         f"grid_{grid_id[0]}_{grid_id[1]}",
@@ -158,38 +159,20 @@ class MergeTif:
                     self.merge_two_tifs(input_tif1, input_tif2, temp_output)
                     merge_count += 1
 
-                    # 如果之前的输入文件是临时文件，则删除它
-                    if 'temp_merged_' in input_tif1:
-                        try:
-                            os.remove(input_tif1)
-                        except Exception as e:
-                            self.logger.warning(f"删除临时文件失败: {str(e)}")
-
                     input_tif1 = temp_output
                     input_tif2 = None
+                    temp_files.append(temp_output)
 
-            # 重命名最终的临时文件为目标文件名
             final_output = os.path.join(
                 self.output_dir, product_info['output'])
-            if os.path.exists(final_output):
-                try:
-                    os.remove(final_output)
-                except Exception as e:
-                    self.logger.warning(f"删除已存在的最终输出文件失败: {str(e)}")
-                    final_output = os.path.join(
-                        self.output_dir,
-                        f"merged_{int(time.time())}_{product_info['output']}"
-                    )
+            shutil.copy2(input_tif1, final_output)
 
-            try:
-                os.rename(input_tif1, final_output)
-            except Exception as e:
-                self.logger.warning(f"重命名最终文件失败: {str(e)}")
-                shutil.copy2(input_tif1, final_output)
+            # 清理所有临时文件
+            for temp_file in temp_files:
                 try:
-                    os.remove(input_tif1)
-                except:
-                    pass
+                    os.remove(temp_file)
+                except Exception as e:
+                    self.logger.warning(f"删除临时文件失败: {str(e)}")
 
             self.logger.info(
                 f"{product_name}合并完成，共执行 {merge_count} 次合并，"