diff --git a/common/file.py b/common/file.py
new file mode 100644
index 0000000000000000000000000000000000000000..65251aab198e72b77cf142eca3b1c113a4cacddb
--- /dev/null
+++ b/common/file.py
@@ -0,0 +1,21 @@
+#!/usr/bin/env python
+# -*- coding: UTF-8 -*-
+# cython:language_level=3
+
+import os
+from common.config import Config
+
+# file operation class
+class FileOperation:
+
+    @staticmethod
+    def remove_txt_file(file_name):
+        '''
+            empty file
+        '''
+        if os.path.exists(Config.get_output_path() + file_name):
+            os.remove(Config.get_output_path() + file_name)
+        else:
+            # os.mkdir(Config.get_output_path() + file_name)
+            file = open(Config.get_output_path() + file_name,'w')
+            file.close()