diff --git a/app/Article.py b/app/Article.py
index e0f006a..35a06a4 100644
--- a/app/Article.py
+++ b/app/Article.py
@@ -32,17 +32,20 @@ def get_article_body(s):
     return '\n'.join(lst)
 
 
-def get_today_article(user_word_list, existing_articles):
+def get_today_article(user_word_list, had_read_articles):
     rq = RecordQuery(path_prefix + 'static/wordfreqapp.db')
-    if existing_articles is None:
-        existing_articles = {
+    if had_read_articles is None:
+        had_read_articles = {
             "index" : 0,  # 为 article_ids 的索引
             "article_ids": []  # 之前显示文章的id列表，越后越新
         }
-    if existing_articles["index"] > len(existing_articles["article_ids"])-1:
+    if had_read_articles["index"] > len(had_read_articles["article_ids"])-1:  # 生成新的文章，因此查找所有的文章
         rq.instructions("SELECT * FROM article")
-    else:
-        rq.instructions('SELECT * FROM article WHERE article_id=%d' % (existing_articles["article_ids"][existing_articles["index"]]))
+    else:  # 生成阅读过的文章，因此查询指定 article_id 的文章
+        if had_read_articles["article_ids"][had_read_articles["index"]] == 'null':  # 可能因为直接刷新页面导致直接去查询了'null'，因此当刷新的页面的时候，需要直接进行“上一篇”操作
+            had_read_articles["index"] -= 1
+            had_read_articles["article_ids"].pop()
+        rq.instructions('SELECT * FROM article WHERE article_id=%d' % (had_read_articles["article_ids"][had_read_articles["index"]]))
     rq.do()
     result = rq.get_results()
     random.shuffle(result)
@@ -53,25 +56,33 @@ def get_today_article(user_word_list, existing_articles):
     d3 = get_difficulty_level(d1, d2)
 
     d = None
+    result_of_generate_article = "not found"
     d_user = load_freq_history(user_word_list)
     user_level = user_difficulty_level(d_user, d3)  # more consideration as user's behaviour is dynamic. Time factor should be considered.
     text_level = 0
-    if existing_articles["index"] > len(existing_articles["article_ids"])-1:  # 下一篇
-        flag_get_article = 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
-            if reading['article_id'] not in existing_articles["article_ids"] and within_range(text_level, user_level, (8.0 - user_level) * factor):  # 新的文章之前没有出现过且符合一定范围的水平
-                d = reading
-                existing_articles["article_ids"].append(d['article_id'])  # 列表添加新的文章id；下面进行
-                flag_get_article = True
-                break
-        if not flag_get_article:
-            existing_articles["index"] -= 1
-    else:  # 上一篇
+    if had_read_articles["index"] > len(had_read_articles["article_ids"])-1:  # 生成新的文章
+        amount_of_had_read_articles = len(had_read_articles["article_ids"])
+        amount_of_existing_articles = result.__len__()
+        if amount_of_had_read_articles == amount_of_existing_articles:  # 如果当前阅读过的文章的数量 == 存在的文章的数量，即所有的书本都阅读过了
+            result_of_generate_article = "had read all articles"
+        else:
+            for k in range(3):  # 最多尝试3次
+                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 reading['article_id'] not in had_read_articles["article_ids"] and within_range(text_level, user_level, (8.0 - user_level) * factor):  # 新的文章之前没有出现过且符合一定范围的水平
+                        d = reading
+                        had_read_articles["article_ids"].append(d['article_id'])  # 列表添加新的文章id；下面进行
+                        result_of_generate_article = "found"
+                        break
+                if result_of_generate_article == "found":  # 用于成功找到文章后及时退出外层循环
+                    break
+        if result_of_generate_article != "found":  # 阅读完所有文章，或者循环3次没有找到适合的文章，则放入空（“null”）
+            had_read_articles["article_ids"].append('null')
+    else:  # 生成已经阅读过的文章
         d = random.choice(result)
         text_level = text_difficulty_level(d['text'], d3)
+        result_of_generate_article = "found"
 
     today_article = None
     if d:
@@ -86,7 +97,7 @@ def get_today_article(user_word_list, existing_articles):
             "answer": get_answer_part(d['question'])
         }
 
-    return existing_articles, today_article
+    return had_read_articles, today_article, result_of_generate_article
 
 
 def load_freq_history(path):
diff --git a/app/account_service.py b/app/account_service.py
index c1bd64c..8de9a03 100644
--- a/app/account_service.py
+++ b/app/account_service.py
@@ -37,7 +37,7 @@ def signup():
                 session[username] = username
                 session['username'] = username
                 session['expiry_date'] = get_expiry_date(username)
-                session['existing_articles'] = None
+                session['had_read_articles'] = None
                 return jsonify({'status': '2'})
             else:
                 return jsonify({'status': '1'})
@@ -66,7 +66,7 @@ def login():
             session['username'] = username
             user_expiry_date = get_expiry_date(username)
             session['expiry_date'] = user_expiry_date
-            session['existing_articles'] = None
+            session['had_read_articles'] = None
             return jsonify({'status': '1'})
         else:
             return jsonify({'status': '0'})
diff --git a/app/pickle_idea2.py b/app/pickle_idea2.py
index 4055fc4..0da55bc 100644
--- a/app/pickle_idea2.py
+++ b/app/pickle_idea2.py
@@ -68,7 +68,7 @@ def save_frequency_to_pickle(d, pickle_fname):
     d2 = {}
     for k in d:
         if not k in exclusion_lst and not k.isnumeric() and not len(k) < 2:
-            d2[k] = list(sorted(set(d[k])))
+            d2[k] = list(sorted(d[k])) # 原先这里是d2[k] = list(sorted(set(d[k])))
     pickle.dump(d2, f)
     f.close()
 
diff --git a/app/static/config.yml b/app/static/config.yml
index 20aa396..e6f7ef1 100644
--- a/app/static/config.yml
+++ b/app/static/config.yml
@@ -1,16 +1,16 @@
 # 全局引入的css文件地址
 css:
   item:
-    - static/css/bootstrap.css
+    - ../static/css/bootstrap.css
 
 # 全局引入的js文件地址
 js:
   head: # 在页面加载之前加载
-    - static/js/jquery.js
-    - static/js/word_operation.js
+    - ../static/js/jquery.js
+    - ../static/js/word_operation.js
   bottom: # 在页面加载完之后加载
-    - static/js/fillword.js
-    - static/js/highlight.js
+    - ../static/js/fillword.js
+    - ../static/js/highlight.js
 
 # 高亮样式，目前仅支持修改颜色
 highlight:
diff --git a/app/templates/admin_index.html b/app/templates/admin_index.html
index 68ee68f..f62a137 100644
--- a/app/templates/admin_index.html
+++ b/app/templates/admin_index.html
@@ -30,7 +30,7 @@
             <div class="collapse navbar-collapse" id="navbarNav">
                 <ul class="navbar-nav">
                     <li class="nav-item">
-                        <a class="nav-link" href="/{{ username }}">返回 {{ username }}</a>
+                        <a class="nav-link" href="/{{ username }}/userpage">返回 {{ username }}</a>
                     </li>
                 </ul>
             </div>
diff --git a/app/templates/login.html b/app/templates/login.html
index ccf6f34..2507f75 100644
--- a/app/templates/login.html
+++ b/app/templates/login.html
@@ -22,7 +22,7 @@
                     alert('无法通过验证。');
                     window.location.href = "/login";
                 } else if (response.status === '1') {
-                    window.location.href = "/"+username;
+                    window.location.href = "/"+username+"/userpage";
                 }
             }
         )
diff --git a/app/templates/mainpage_get.html b/app/templates/mainpage_get.html
index 3594571..344943d 100644
--- a/app/templates/mainpage_get.html
+++ b/app/templates/mainpage_get.html
@@ -23,7 +23,7 @@
     <div class="container-fluid">
         <p><b><font size="+3" color="red">English Pal - Learn English smartly!</font></b></p>
         {% if session['logged_in'] %}
-            <a href="/{{ session['username'] }}">{{ session['username'] }}</a>
+            <a href="/{{ session['username'] }}/userpage">{{ session['username'] }}</a>
             {% if session['username'] == admin_name %}
             <a href="/admin">管理</a></p>
             {% endif %}
diff --git a/app/templates/reset.html b/app/templates/reset.html
index d29855b..3425c97 100644
--- a/app/templates/reset.html
+++ b/app/templates/reset.html
@@ -45,7 +45,7 @@
         <input type="password" placeholder="新密码" class="new-password" name="new-password" id="new-password"/>
         <input type="password" placeholder="确认新密码" class="re-new-password" name="re-new-password" id="re-new-password"/>
         <button id="submit" class="btn" onclick="reset()">提交</button>
-        <button class="btn" onclick="window.location.href='/{{ username }}'">放弃修改</button>
+        <button class="btn" onclick="window.location.href='/{{ username }}/userpage'">放弃修改</button>
 
     </div>
 {% endblock %}
\ No newline at end of file
diff --git a/app/templates/signup.html b/app/templates/signup.html
index c70e4ba..9030d41 100644
--- a/app/templates/signup.html
+++ b/app/templates/signup.html
@@ -35,7 +35,7 @@ You're logged in already! <a href="/logout">Logout</a>.
                     } else if (response.status === '2') {
                         let f = confirm("恭喜，你已成功注册，你的用户名是"+username+'.\n点击“确认”开始使用，或点击“取消”返回首页');
                         if (f) {
-                            window.location.href = '/'+username;
+                            window.location.href = '/'+username+'/userpage';
                         } else {
                             window.location.href = '/';
                         }
diff --git a/app/templates/userpage_get.html b/app/templates/userpage_get.html
index b5e16aa..098674d 100644
--- a/app/templates/userpage_get.html
+++ b/app/templates/userpage_get.html
@@ -37,24 +37,28 @@
 <body>
 <div class="container-fluid">
     <p><b>English Pal for <font id="username" color="red">{{ username }}</font></b>
+
         {% if username ==  admin_name %}
         <a class="btn btn-secondary" href="/admin" role="button" onclick="stopRead()">管理</a>
         {% endif %}
-        <a class="btn btn-secondary" href="/logout" role="button" onclick="stopRead()">退出</a>
+        <a id="quit" class="btn btn-secondary" href="/logout" role="button" onclick="stopRead()">退出</a>
         <a class="btn btn-secondary" href="/reset" role="button" onclick="stopRead()">重设密码</a>
+
     </p>
 {#    {% for message in flashed_messages %}#} {# 根据user_service.userpage,取消了参数flashed_messages，因此注释了这段代码 #}
 {#        <div class="alert alert-warning" role="alert">Congratulations! {{ message }}</div>#}
 {#    {% endfor %}#}
 
-    <a class="btn btn-success" href="/{{ username }}/reset" role="button"> 下一篇 Next Article </a>
-    {% if session.get('existing_articles') != None and session.get('existing_articles')["index"] !=0 %}
-        <a class="btn btn-success" href="/{{ username }}/back" role="button"> 上一篇 Previous Article </a>
+    {% if result_of_generate_article != "had read all articles" %}
+        <a id="next_btn" class="btn btn-success" href="/{{ username }}/reset" role="button"> 下一篇 Next Article </a>
+    {% endif %}
+    {% if session.get('had_read_articles') and session.get('had_read_articles')['index']>0 %}
+        <a id="pre_btn" class="btn btn-success" href="/{{ username }}/back" role="button"> 上一篇 Previous Article </a>
     {% endif %}
 
     <p><b>阅读文章并回答问题</b></p>
     <div id="text-content">
-        {% if today_article %}
+        {% if result_of_generate_article == 'found' %}
             <div class="alert alert-success" role="alert">According to your word list, your level is <span class="badge bg-success">{{ today_article["user_level"] }}</span>  and we have chosen an article with a difficulty level of <span class="badge bg-success">{{ today_article["text_level"] }}</span> for you.</div>
                 <p class="text-muted">Article added on: {{ today_article["date"] }}</p><br/>
             <div class="p-3 mb-2 bg-light text-dark"><br/>
@@ -74,10 +78,14 @@
                 <button onclick="toggle_visibility('answer');">ANSWER</button>
                 <div id="answer" style="display:none;">{{ today_article['answer'] }}</div><br/>
             </div>
-        {% else %}
+        {% elif result_of_generate_article == "not found" %}
             <div class="alert alert-success" role="alert">
                 <p class="text-muted"><span class="badge bg-success">Notes:</span><br>No article is currently available for you. You can try again a few times or mark new words in the passage to improve your level.</p>
             </div>
+        {% elif result_of_generate_article == "had read all articles" %}
+            <div class="alert alert-success" role="alert">
+                <p class="text-muted"><span class="badge bg-success">Notes:</span><br>You've read all the articles.</p>
+            </div>
         {% endif %}
     </div>
 
@@ -93,7 +101,7 @@
         </div>
     </div>
     <p><b>收集生词吧</b> （可以在正文中划词，也可以复制黏贴）</p>
-    <form method="post" action="/{{ username }}">
+    <form method="post" action="/{{ username }}/userpage">
         <textarea name="content" id="selected-words" rows="10" cols="120"></textarea><br/>
         <input type="submit" value="把生词加入我的生词库"/>
         <input type="reset" value="清除"/>
diff --git a/app/user_service.py b/app/user_service.py
index c69c9e2..787acf4 100644
--- a/app/user_service.py
+++ b/app/user_service.py
@@ -30,9 +30,12 @@ def user_reset(username):
     :return: 返回页面内容
     '''
     if request.method == 'GET':
-        existing_articles = session.get("existing_articles")
-        existing_articles["index"] += 1
-        session["existing_articles"] = existing_articles
+        had_read_articles = session.get("had_read_articles")
+        if had_read_articles['article_ids'][-1] == "null":  # 如果当前还是“null”，则将“null”pop出来,无需index+=1
+            had_read_articles['article_ids'].pop()
+        else:  # 当前不为“null”，直接 index+=1
+            had_read_articles["index"] += 1
+        session["had_read_articles"] = had_read_articles
         return redirect(url_for('user_bp.userpage', username=username))
     else:
         return 'Under construction'
@@ -45,9 +48,11 @@ def user_back(username):
     :return: 返回页面内容
     '''
     if request.method == 'GET':
-        existing_articles = session.get("existing_articles")
-        existing_articles["index"] -= 1
-        session["existing_articles"] = existing_articles
+        had_read_articles = session.get("had_read_articles")
+        had_read_articles["index"] -= 1  # 上一篇，index-=1
+        if had_read_articles['article_ids'][-1] == "null":  # 如果当前还是“null”，则将“null”pop出来
+            had_read_articles['article_ids'].pop()
+        session["had_read_articles"] = had_read_articles
         return redirect(url_for('user_bp.userpage', username=username))
 
 
@@ -97,7 +102,7 @@ def deleteword(username, word):
     return "success"
 
 
-@userService.route("/<username>", methods=['GET', 'POST'])
+@userService.route("/<username>/userpage", methods=['GET', 'POST'])
 def userpage(username):
     '''
     用户界面
@@ -134,8 +139,8 @@ def userpage(username):
         words = ''
         for x in lst3:
             words += x[0] + ' '
-        existing_articles, today_article = get_today_article(user_freq_record, session.get('existing_articles'))
-        session['existing_articles'] = existing_articles
+        had_read_articles, today_article, result_of_generate_article = get_today_article(user_freq_record, session.get('had_read_articles'))
+        session['had_read_articles'] = had_read_articles
         # 通过 today_article，加载前端的显示页面
         return render_template('userpage_get.html',
                                admin_name=ADMIN_NAME,
@@ -143,6 +148,7 @@ def userpage(username):
                                session=session,
                                # flashed_messages=get_flashed_messages(), 仅有删除单词的时候使用到flash，而删除单词是异步执行，这里的信息提示是同步执行，所以就没有存在的必要了
                                today_article=today_article,
+                               result_of_generate_article=result_of_generate_article,
                                d_len=len(d),
                                lst3=lst3,
                                yml=Yaml.yml,