diff --git a/pygitlog/fsoperation.py b/pygitlog/fsoperation.py
new file mode 100644
index 0000000..077a492
--- /dev/null
+++ b/pygitlog/fsoperation.py
@@ -0,0 +1,42 @@
+import os
+
+def mkdir(path):
+    # 去除首位空格
+    path=path.strip()
+    # 去除尾部 \ 符号
+    path=path.rstrip("\\")
+    # 判断路径是否存在
+    isExists=os.path.exists(path)
+    # 判断结果
+    if not isExists:
+        os.makedirs(path) 
+
+#文档内容删除，head代表从第几行开始要，tail表示倒数第几行开始不要
+def delete_lines(file_name, head,tail):
+    fin = open(file_name, 'r')
+    a = fin.readlines()
+    fout = open(file_name, 'w')
+    b = ''.join(a[head:-tail])
+    fout.write(b)
+
+##实现body的展开功能（attr为summary）
+def format(str1,str2):
+    list = "<details><summary>" + str1 + "</summary> " 
+    list = list + str2.replace('\n','<br>')+"</details>"
+    return list
+
+##实现文件差别的展开功能（首行summary）
+def format_diff(str):
+    a = 0
+    if str.count('\n') > 1:
+        for line in str.split('\n'):
+            if a == 0:
+                #防止首行为空，其实没必要
+                if line != '':
+                    list = "<details><summary>" + line + "</summary> "
+                    a = 1  
+            else:
+                list = list + line + '<br>'
+        return list + "</details>"
+    else:
+        return str.replace('\n','')
\ No newline at end of file