diff --git a/app/WordFreq.py b/app/WordFreq.py
index 3620a41..0528b63 100644
--- a/app/WordFreq.py
+++ b/app/WordFreq.py
@@ -20,6 +20,6 @@ class WordFreq:
     
 
 if __name__ == '__main__':
-    f = WordFreq('BANANA; Banana, apple ORANGE Banana banana.')
+    f = WordFreq('i\'m BANANA; Banana, apple ORANGE Bana-na/////,./;\'[]-=---\'/-banana.')
     print(f.get_freq())
 
diff --git a/app/wordfreqCMD.py b/app/wordfreqCMD.py
index 9ee7e56..c7c90fa 100644
--- a/app/wordfreqCMD.py
+++ b/app/wordfreqCMD.py
@@ -8,6 +8,7 @@ import string
 import operator
 import os, sys # 引入模块sys，因为我要用里面的sys.argv列表中的信息来读取命令行参数。
 import pickle_idea
+import re
 
 def freq(fruit):
     '''
@@ -18,7 +19,7 @@ def freq(fruit):
     '''
 
     result = []
-    
+
     fruit = fruit.lower() # 字母转小写
     flst = fruit.split()  # 字符串转成list
     c = collections.Counter(flst)
@@ -39,19 +40,26 @@ def file2str(fname):#文件转字符
 
 
 def remove_punctuation(s): # 这里是s是形参 (parameter)。函数被调用时才给s赋值。
-    special_characters = '_©~=+[]*&$%^@.,?!:;#()"“”—‘’' # 把里面的字符都去掉
+    special_characters = '_©~=+[]*&$%^@.,?!:;#()"“”—‘’'  #把里面的字符都去掉
     for c in special_characters:
         s = s.replace(c, ' ') # 防止出现把 apple,apple 移掉逗号后变成 appleapple 情况
     s = s.replace('--', ' ')
+    '''cop = re.compile("[^a-z^A-Z^\\']")#通过正则表达式保留英文字符和-、'两个特殊字符
+    s=cop.sub(' ' , s)'''
     s = s.strip() # 去除前后的空格
-    
-    if '\'' in s:
+    #s=keep_need_punctuation(s,'-')
+    s=keep_need_punctuation(s,'\'')
+    return s
+
+
+def keep_need_punctuation(s,need):#用于保留特定的字符
+    if need in s:
         n = len(s)
-        t = '' # 用来收集我需要保留的字符
-        for i in range(n): # 只有单引号前后都有英文字符，才保留
-            if s[i] == '\'':
+        t = ''  # 用来收集我需要保留的字符
+        for i in range(n):  # 只有单引号前后都有英文字符，才保留
+            if s[i] == need:
                 i_is_ok = i - 1 >= 0 and i + 1 < n
-                if i_is_ok and s[i-1] in string.ascii_letters and s[i+1] in string.ascii_letters:
+                if i_is_ok and s[i - 1] in string.ascii_letters and s[i + 1] in string.ascii_letters:
                     t += s[i]
             else:
                 t += s[i]
@@ -59,7 +67,6 @@ def remove_punctuation(s): # 这里是s是形参 (parameter)。函数被调用
     else:
         return s
 
-
 def sort_in_descending_order(lst):# 单词按频率降序排列
     lst2 = sorted(lst, reverse=True, key=lambda x: (x[1], x[0]))
     return lst2
@@ -104,7 +111,7 @@ if __name__ == '__main__':
         print('%s\t%d\t%s' % (x[0], x[1], youdao_link(x[0])))#函数导出
 
     # 把频率的结果放result.html中
-    make_html_page(sort_in_descending_order(L), 'result.html') 
+    make_html_page(sort_in_descending_order(L), 'result.html')
 
     print('\nHistory:\n')
     if os.path.exists('frequency.p'):