diff --git a/app/Article.py b/app/Article.py
index 774d25a..27cb6f7 100644
--- a/app/Article.py
+++ b/app/Article.py
@@ -54,13 +54,55 @@ def get_today_article(user_word_list, articleID):
     d = random.choice(result)
     text_level = text_difficulty_level(d['text'], d3)
     if articleID == None:
+        # print('result = ', len(result), sep=' ')
+        p = False
         for reading in result:
             text_level = text_difficulty_level(reading['text'], d3)
-            factor = random.gauss(0.8,
-                                  0.1)  # a number drawn from Gaussian distribution with a mean of 0.8 and a stand deviation of 1
+            factor = random.gauss(0.8, 0.1)  # a number drawn from Gaussian distribution with a mean of 0.8 and a stand deviation of 1
             if within_range(text_level, user_level, (8.0 - user_level) * factor):
-                d = reading
-                break
+                list = session.get('articleIdList')
+                if list == None:
+                    d = reading
+                    list = [reading['article_id']]
+                    session['articleIdList'] = list
+                    p = True
+                    break
+
+                exist = False
+                for i in list:
+                    if reading['article_id'] == i:
+                        exist = True
+                        break
+                if exist == False:
+                    d = reading
+                    list.append(reading['article_id'])
+                    session['articleIdList']=list
+                    p = True
+                    break
+        if p == False:
+            session['articleIdList'] = None
+            p = True
+            while p:
+                for reading in result:
+                    text_level = text_difficulty_level(reading['text'], d3)
+                    factor = random.gauss(0.8, 0.1)  # a number drawn from Gaussian distribution with a mean of 0.8 and a stand deviation of 1
+                    if within_range(text_level, user_level, (8.0 - user_level) * factor):
+                        if reading['article_id'] != session['prearticleID']:
+                            d = reading
+                            p = False
+    '''
+    测试代码：
+    print(session['articleIdList'])
+    print(session['prearticleID'], d['article_id'], sep=' ')
+    
+    问题描述：选择下一篇文章时，由于没有考虑选择文章时会重复选择当前文章，可能会导致重复进入某一篇文章
+    解决方法：选择下一篇文章时，将选择的文章ID和当前文章ID比较，若重复则换一个
+    进一步优化：
+        问题描述：利用上述方法可以满足不重复进入某一篇文章，但是可能两篇文章会反复出现
+        解决方法：记录一个队列，用来保存出现过的文章ID
+                选择文章时，若文章Id出现在队列中，则放弃；
+                若都出现过，则清空队列，随机选择一个不与当前文章重复的文章 
+    '''
 
     s = '<div class="alert alert-success" role="alert">According to your word list, your level is <span class="badge bg-success">%4.2f</span>  and we have chosen an article with a difficulty level of <span class="badge bg-success">%4.2f</span> for you.</div>' % (
         user_level, text_level)
diff --git a/app/account_service.py b/app/account_service.py
index 753c51e..bd56ddb 100644
--- a/app/account_service.py
+++ b/app/account_service.py
@@ -36,6 +36,8 @@ def signup():
                 session['username'] = username
                 session['expiry_date'] = get_expiry_date(username)
                 session['articleID'] = None
+                session['articleIdList'] = None
+                session['prearticleID'] = None
                 return '<p>恭喜，你已成功注册， 你的用户名是 <a href="%s">%s</a>。</p>\
                 <p><a href="/%s">开始使用</a> <a href="/">返回首页</a><p/>' % (username, username, username)
             else:
diff --git a/app/user_service.py b/app/user_service.py
index 139c140..3812109 100644
--- a/app/user_service.py
+++ b/app/user_service.py
@@ -30,6 +30,7 @@ def user_reset(username):
     :return: 返回页面内容
     '''
     if request.method == 'GET':
+        session['prearticleID'] = session['articleID']
         session['articleID'] = None
         return redirect(url_for('user_bp.userpage', username=username))
     else: