diff --git a/language_learning/2022.09.12_creat_necessary_file_or_delete_file_with_specific_name/creat_necessary_file_or_delete_file_with_specific_name.py b/language_learning/2022.09.12_creat_necessary_file_or_delete_file_with_specific_name/creat_necessary_file_or_delete_file_with_specific_name.py
index b8e492b..05a0f75 100644
--- a/language_learning/2022.09.12_creat_necessary_file_or_delete_file_with_specific_name/creat_necessary_file_or_delete_file_with_specific_name.py
+++ b/language_learning/2022.09.12_creat_necessary_file_or_delete_file_with_specific_name/creat_necessary_file_or_delete_file_with_specific_name.py
@@ -14,13 +14,20 @@ def main():
     # guan.delete_file_with_specific_name(directory)
 
 
-def creat_necessary_file(directory, filename='readme', file_format='.md', content=''):
+def creat_necessary_file(directory, filename='readme', file_format='.md', content='', overwrite=None):
     import os
     directory_with_file = []
+    missed_directory = []
     for root, dirs, files in os.walk(directory):
         for i0 in range(len(files)):
             if root not in directory_with_file:
                 directory_with_file.append(root)
+            if files[i0] == filename+file_format:
+                if root not in missed_directory:
+                    missed_directory.append(root)
+    if overwrite == None:
+        for root in missed_directory:
+            directory_with_file.remove(root)
     for root in directory_with_file:
         os.chdir(root)
         f = open(filename+file_format, 'w', encoding="utf-8")