diff --git a/ENVIxml2csv_czh.py b/ENVIxml2csv_czh.py
index 5a10293..d7c1ac8 100644
--- a/ENVIxml2csv_czh.py
+++ b/ENVIxml2csv_czh.py
@@ -17,7 +17,7 @@ root = tree.getroot()
 
 
 # 创建CSV文件
-with open(csv_file, 'w', newline='', encoding='UTF-8') as csvfile:
+with open(csv_file, 'a', newline='', encoding='UTF-8') as csvfile:
     csvwriter = csv.writer(csvfile)
     # 写入CSV标题行
     csvwriter.writerow(['parent_id','id','covernm','roi_polygon'])