diff --git a/contributors/sustnf/file.py b/contributors/sustnf/file.py
new file mode 100644
index 0000000000000000000000000000000000000000..b25ee4cf96f97b96318976b5a43be9f32864defb
--- /dev/null
+++ b/contributors/sustnf/file.py
@@ -0,0 +1,70 @@
+# -*- coding:utf-8 -*-
+
+import os
+import shutil
+import sys
+from typing import List
+
+class HiddenPrints:
+    def __enter__(self):
+        self._original_stdout = sys.stdout
+        sys.stdout = open(os.devnull, "w")
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        sys.stdout.close()
+        sys.stdout = self._original_stdout
+
+
+
+# 判断文件夹中是否有超过固定大小的文件
+# 可对超过具体大小的文件做删除,移动等操作,后续优化
+# folder:文件夹
+# size:大小(M)
+def screen_file(folder, size:int):
+    size = size *1024 *1024
+    res = []
+    reslist = []
+    for path, dirs, file_names in os.walk(folder, topdown=True):
+        for filename in file_names:
+            res.append(os.path.join(path, filename))
+    for r in res:
+        if os.path.getsize(r) > size:
+            reslist.append(r)
+    if len(reslist) == 0:
+        print("没有超过%sM大小的文件" % (size/1024/1024))
+    else:
+        print("有超过%sM大小的文件" % (size/1024/1024))
+        for r in reslist:
+            print(r)
+
+# screen_file("E:\\",200)
+
+
+
+# 判断文件夹中指定后缀的文件(后缀可多写List类型)['.exe','.txt','.md']
+def screen_suffix(folder, suffix:List):
+    reslist = []
+    for s in range(len(suffix)):
+            # with HiddenPrints():
+                one_suffix(folder, suffix[s], reslist)
+    for r in reslist:
+        print(r)
+        
+
+# 判断文件夹中指定后缀的文件
+def one_suffix(folder, suf, res=None):
+    res = []
+    datanames = os.listdir(folder)
+    for dataname in datanames:
+        t = os.path.join(folder, dataname)
+        if os.path.isfile(t):
+            if dataname.endswith(suf):
+                    res.append(os.path.join(folder, dataname))
+        elif os.path.isdir(t):
+            one_suffix(t, suf, res)
+    for r in res:
+        print(r)
+
+
+# screen_suffix("E:\项目(gitee)", ['.txt','.md','.js'])
+# one_suffix("E:\项目(gitee)",".md")
diff --git a/contributors/sustnf/md5_verify.py b/contributors/sustnf/md5_verify.py
new file mode 100644
index 0000000000000000000000000000000000000000..fb7faf16ca14cdeea44b60deae0d228e55d07832
--- /dev/null
+++ b/contributors/sustnf/md5_verify.py
@@ -0,0 +1,89 @@
+# -*- coding:utf-8 -*-
+
+import hashlib
+import os
+
+
+# 文件md5校验
+# source_file:文件1
+# target_file:文件2
+def file_compare(source_file,target_file):
+    s = open(source_file, "br")
+    t = open(target_file, "br")
+    md5_source_file = hashlib.md5(s.read()).hexdigest()
+    md5_target_file = hashlib.md5(t.read()).hexdigest()
+    if md5_source_file == md5_target_file:
+        print("文件%s和文件%s\tmd5值相同" % (source_file, target_file))
+    else:
+        print("文件%s和文件%s\tmd5值不相同" % (source_file, target_file))
+
+
+# 文件夹(子目录)md5校验。生成.csv文档,用于查看对比结果(使用excel打开即可)
+# 目前校验相同和不相同都在同一文件下,后续优化
+# source_folder:文件夹1
+# target_folder:文件夹2
+# result.csv生成在执行目录下
+def folder_compare(source_folder,target_folder):
+    output_file = os.getcwd() + "\\result.csv"
+    # 判断是否已指定的路径分隔符结尾
+    if source_folder.endswith(os.path.sep) and len(source_folder) > 1:
+        source_folder = source_folder[:-1]
+    if target_folder.endswith(os.path.sep) and len(target_folder) > 1:
+        target_folder = target_folder[:-1]
+    # 遍历文件或者目录
+    t = os.walk(source_folder, topdown=True)
+    # os.walk返回一个三元组
+    # path:当前正在遍历的这个文件夹的本身的地址, 
+    # dirs:是一个list,内容是该文件夹中所有的目录的名字(不包括子目录), 
+    # file_names:是一个list,内容是该文件夹中所有的文件(不包括子目录),
+    # topdown参数为真，walk会遍历source_folder文件夹,与source_folder文件夹中每一个子目录
+    output_file = open(output_file, "w+")
+    for path, dirs, file_names in t:
+        for filename in file_names:
+            source_file = os.path.join(path, filename)
+            # 链接路径
+            target_file = source_file.replace(source_folder, target_folder)
+            f = open(source_file, "br")
+            # print(source_file)
+            # md5值
+            md5_source_file = hashlib.md5(f.read()).hexdigest()
+            f.close()
+            if os.path.exists(target_file):
+                f = open(target_file, "br")
+                md5_target_file = hashlib.md5(f.read()).hexdigest()
+                f.close()
+                if md5_source_file == md5_target_file:
+                    try:
+                        output_file.write(
+                            "%s,%s,%s,%s,%s\n" % (source_file, md5_source_file, target_file, md5_target_file, "true")
+                        )
+                    except:
+                        output_file.write(
+                            ",%s,,%s,%s\n" % ("", md5_source_file, "", md5_target_file, "true")
+                        )
+                    print("%s 和 %s 相等,记录在校验结果中" % (source_file, target_file))
+                else:
+                    try:
+                        output_file.write(
+                            "%s,%s,%s,%s,%s\n" % (source_file, md5_source_file, target_file, md5_target_file, "false")
+                        )
+                    except:
+                        output_file.write(
+                            ",%s,,%s,%s\n" % ("", md5_source_file, "", md5_target_file, "false")
+                        )
+                    print("%s 和 %s 不相等,记录在校验结果中" % (source_file, target_file))
+            else:
+                try:
+                    output_file.write(
+                        "%s,%s,%s,%s,%s\n" % (source_file, md5_source_file, "not exists", "", "false")
+                        )
+                except:
+                    output_file.write(
+                        ",%s,,%s,%s\n" % ("", md5_source_file, "", "not exists", "false")
+                    )
+                print("%s不存在target(目标文件夹),记录在校验结果中" % source_file)
+    output_file.close()
+    print("校验完成,结果请查看%s文件" % (output_file.name))
+
+# file_compare("D:\\blog\\bin\\yarn","C:\\Users\\DUZUN\\Desktop\\bin\\yarn")
+# folder_compare("D:\\blog\\bin","C:\\Users\\DUZUN\\Desktop\\bin")
\ No newline at end of file