diff --git a/app/Yaml.py b/app/Yaml.py
index 00974aa..8823041 100644
--- a/app/Yaml.py
+++ b/app/Yaml.py
@@ -1,13 +1,15 @@
-'''
+"""
 Yaml.py
 配置文件包括:
     ./static/config.yml
     ./layout/partial/header.html
     ./layout/partial/footer.html
-'''
+"""
 import yaml as YAML
 import os
 
+from app.file_open import FileOpen
+
 path_prefix = './'  # comment this line in deployment
 
 # YAML文件路径
@@ -15,13 +17,16 @@ ymlPath = path_prefix + 'static/config.yml'
 
 # partial文件夹路径
 partialPath = path_prefix + 'layout/partial/'
-f = open(ymlPath, 'r', encoding='utf-8') # 以'UTF-8'格式打开YAML文件
+# f = open(ymlPath, 'r', encoding='utf-8') # 以'UTF-8'格式打开YAML文件
+f = FileOpen.read_only(ymlPath, 'r', encoding='utf-8') # 以'UTF-8'格式打开YAML文件
 cont = f.read()  # 以文本形式读取YAML
 
 yml = YAML.load(cont, Loader=YAML.FullLoader)  # 加载YAML
 
-with open(partialPath + 'header.html', 'r', encoding='utf-8') as f:
+# with open(partialPath + 'header.html', 'r', encoding='utf-8') as f:
+with FileOpen.read_only(partialPath + 'header.html', 'r', encoding='utf-8') as f:
     yml['header'] = f.read() # header内的文本会被直接添加到所有页面的head标签内
 
-with open(partialPath + 'footer.html', 'r', encoding='utf-8') as f:
+# with open(partialPath + 'footer.html', 'r', encoding='utf-8') as f:
+with FileOpen.read_only(partialPath + 'footer.html', 'r', encoding='utf-8') as f:
     yml['footer'] = f.read() # footer内的文本会被直接添加到所有页面的最底部
diff --git a/app/difficulty.py b/app/difficulty.py
index 50aa179..5eb12bd 100644
--- a/app/difficulty.py
+++ b/app/difficulty.py
@@ -7,11 +7,14 @@
 
 import pickle
 import math
+
+from app.file_open import FileOpen
 from wordfreqCMD import remove_punctuation, freq, sort_in_descending_order, sort_in_ascending_order
 
 
 def load_record(pickle_fname):
-    f = open(pickle_fname, 'rb')
+    # f = open(pickle_fname, 'rb')
+    f = FileOpen.read_only(pickle_fname, 'rb')
     d = pickle.load(f)
     f.close()
     return d
@@ -237,7 +240,8 @@ We need — for our farmers, our manufacturers, for, frankly, unions and non-uni
 
 
     #f = open('bbc-fulltext/bbc/entertainment/001.txt')
-    f = open('wordlist.txt')
+    # f = open('wordlist.txt')
+    f = FileOpen.read_only('wordlist.txt')
     s = f.read()
     f.close()
 
diff --git a/app/file_open.py b/app/file_open.py
index ee5512a..69d2f9d 100644
--- a/app/file_open.py
+++ b/app/file_open.py
@@ -15,7 +15,7 @@ class FileOpen:
         pass
 
     @staticmethod
-    def read_only(path, mode='r'):
+    def read_only(path, mode='r', encoding=None):
         if mode not in ['r', 'r+', 'rb', 'rt', 'rb+', 'rt+']:
             raise ModeErrorException('the input mode is wrong')
         my_dir = os.path.dirname(path)  # 获得路径的目录
@@ -23,17 +23,17 @@ class FileOpen:
             os.makedirs(my_dir)  # 创建所有父文件夹
         # 读文件需要判断文件是否存在，不存在则创建
         if not os.path.exists(path):
-            open(path, mode)
-        return open(path, mode)
+            open(path, mode, encoding)
+        return open(path, mode, encoding)
 
     @staticmethod
-    def write_able(path, mode='w'):
+    def write_able(path, mode='w', encoding=None):
         if mode not in ['w', 'w+', 'wb', 'wt', 'wb+', 'wt+']:
             raise ModeErrorException('the input mode is wrong')
         my_dir = os.path.dirname(path)  # 获得路径的目录
         if not os.path.exists(my_dir):  # 判断文件的所有父文件夹是否存在
             os.makedirs(my_dir)  # 创建所有父文件夹
-        return open(path, mode)
+        return open(path, mode, encoding)
 
 
 if __name__ == "__main__":
diff --git a/app/pickle_idea.py b/app/pickle_idea.py
index 45bd19a..3c0c853 100644
--- a/app/pickle_idea.py
+++ b/app/pickle_idea.py
@@ -9,6 +9,8 @@
 import pickle
 from datetime import datetime
 
+from app.file_open import FileOpen
+
 
 def lst2dict(lst, d):
     ''' 
@@ -37,14 +39,16 @@ def merge_frequency(lst1, lst2):
 
 
 def load_record(pickle_fname):
-    f = open(pickle_fname, 'rb')
+    # f = open(pickle_fname, 'rb')
+    f = FileOpen.read_only(pickle_fname, 'rb')
     d = pickle.load(f)
     f.close()
     return d
 
 
 def save_frequency_to_pickle(d, pickle_fname):
-    f = open(pickle_fname, 'wb')
+    # f = open(pickle_fname, 'wb')
+    f = FileOpen.write_able(pickle_fname, 'wb')
     #exclusion_lst = ['one', 'no', 'has', 'had', 'do', 'that', 'have', 'by', 'not', 'but', 'we', 'this', 'my', 'him', 'so', 'or', 'as', 'are', 'it', 'from', 'with', 'be', 'can', 'for', 'an', 'if', 'who', 'whom', 'whose', 'which', 'the', 'to', 'a', 'of', 'and', 'you', 'i', 'he', 'she', 'they', 'me', 'was', 'were', 'is', 'in', 'at', 'on', 'their', 'his', 'her', 's', 'said', 'all', 'did', 'been', 'w']
     exclusion_lst = []
     d2 = {}
@@ -55,20 +59,24 @@ def save_frequency_to_pickle(d, pickle_fname):
     f.close()
 
 def unfamiliar(path,word):
-    f = open(path,"rb")
+    # f = open(path,"rb")
+    f = FileOpen.read_only(path, 'rb')
     dic = pickle.load(f)
     dic[word] += [datetime.now().strftime('%Y%m%d%H%M')]
-    fp = open(path,"wb")
+    # fp = open(path,"wb")
+    fp = FileOpen.write_able(path, 'wb')
     pickle.dump(dic,fp)
 
 def familiar(path,word):
-    f = open(path,"rb")
+    # f = open(path,"rb")
+    f = FileOpen.read_only(path, 'rb')
     dic = pickle.load(f)
     if len(dic[word])>1:
         del dic[word][0]
     else:
         dic.pop(word)
-    fp = open(path,"wb")
+    # fp = open(path,"wb")
+    fp = FileOpen.write_able(path, 'wb')
     pickle.dump(dic,fp)
 
 if __name__ == '__main__':
diff --git a/app/pickle_idea2.py b/app/pickle_idea2.py
index 4055fc4..ab84901 100644
--- a/app/pickle_idea2.py
+++ b/app/pickle_idea2.py
@@ -11,6 +11,9 @@
 import pickle
 from datetime import datetime
 
+from app.file_open import FileOpen
+
+
 def lst2dict(lst, d):
     ''' 
     Store the information in list lst to dictionary d. 
@@ -26,14 +29,16 @@ def lst2dict(lst, d):
             d[word] += dates
 
 def deleteRecord(path,word):
-    with open(path, 'rb') as f:
+    # with open(path, 'rb') as f:
+    with FileOpen.read_only(path, 'rb') as f:
         db = pickle.load(f)
     try:
         db.pop(word)
     except KeyError:
         print("sorry")
-    with open(path, 'wb') as ff:
-            pickle.dump(db, ff)
+    # with open(path, 'wb') as ff:
+    with FileOpen.write_able(path, 'wb') as ff:
+        pickle.dump(db, ff)
 
 def dict2lst(d):
     if len(d) > 0:
@@ -56,14 +61,16 @@ def merge_frequency(lst1, lst2):
 
 
 def load_record(pickle_fname):
-    f = open(pickle_fname, 'rb')
+    # f = open(pickle_fname, 'rb')
+    f = FileOpen.read_only(pickle_fname, 'rb')
     d = pickle.load(f)
     f.close()
     return d
 
 
 def save_frequency_to_pickle(d, pickle_fname):
-    f = open(pickle_fname, 'wb')
+    # f = open(pickle_fname, 'wb')
+    f = FileOpen.write_able(pickle_fname, 'wb')
     exclusion_lst = ['one', 'no', 'has', 'had', 'do', 'that', 'have', 'by', 'not', 'but', 'we', 'this', 'my', 'him', 'so', 'or', 'as', 'are', 'it', 'from', 'with', 'be', 'can', 'for', 'an', 'if', 'who', 'whom', 'whose', 'which', 'the', 'to', 'a', 'of', 'and', 'you', 'i', 'he', 'she', 'they', 'me', 'was', 'were', 'is', 'in', 'at', 'on', 'their', 'his', 'her', 's', 'said', 'all', 'did', 'been', 'w']
     d2 = {}
     for k in d:
diff --git a/app/wordfreqCMD.py b/app/wordfreqCMD.py
index 9ee7e56..d421ef2 100644
--- a/app/wordfreqCMD.py
+++ b/app/wordfreqCMD.py
@@ -8,6 +8,8 @@ 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
+from app.file_open import FileOpen
+
 
 def freq(fruit):
     '''
@@ -32,7 +34,8 @@ def youdao_link(s): # 有道链接
 
 
 def file2str(fname):#文件转字符
-    f = open(fname) #打开
+    # f = open(fname) #打开
+    f = FileOpen.read_only(fname)
     s = f.read()    #读取
     f.close()       #关闭
     return s
@@ -80,7 +83,8 @@ def make_html_page(lst, fname):
         # <a href="">word</a>
         s += '<p>%d <a href="%s">%s</a> (%d)</p>' % (count, youdao_link(x[0]), x[0], x[1])
         count += 1
-    f = open(fname, 'w')
+    # f = open(fname, 'w')
+    f = FileOpen.write_able(fname)
     f.write(s)
     f.close()