diff --git a/app/Article.py b/app/Article.py
index e0f006a..e395114 100644
--- a/app/Article.py
+++ b/app/Article.py
@@ -8,6 +8,7 @@ import hashlib
 from datetime import datetime
 from flask import Flask, request, redirect, render_template, url_for, session, abort, flash, get_flashed_messages
 from difficulty import get_difficulty_level, text_difficulty_level, user_difficulty_level
+from model.article import get_number_of_articles, get_article, get_article_by_id
 
 
 path_prefix = '/var/www/wordfreq/wordfreq/'
@@ -15,11 +16,7 @@ path_prefix = './'  # comment this line in deployment
 
 
 def total_number_of_essays():
-    rq = RecordQuery(path_prefix + 'static/wordfreqapp.db')
-    rq.instructions("SELECT * FROM article")
-    rq.do()
-    result = rq.get_results()
-    return len(result)
+    get_number_of_articles()
 
 
 def get_article_title(s):
@@ -33,18 +30,15 @@ def get_article_body(s):
 
 
 def get_today_article(user_word_list, existing_articles):
-    rq = RecordQuery(path_prefix + 'static/wordfreqapp.db')
     if existing_articles is None:
         existing_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:
-        rq.instructions("SELECT * FROM article")
+        result = list(get_article())   # 转为一个list
     else:
-        rq.instructions('SELECT * FROM article WHERE article_id=%d' % (existing_articles["article_ids"][existing_articles["index"]]))
-    rq.do()
-    result = rq.get_results()
+        result = [get_article_by_id(existing_articles["article_ids"][existing_articles["index"]])]
     random.shuffle(result)
 
     # Choose article according to reader's level
@@ -59,31 +53,31 @@ def get_today_article(user_word_list, existing_articles):
     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)
+            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
+            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
+                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
         d = random.choice(result)
-        text_level = text_difficulty_level(d['text'], d3)
+        text_level = text_difficulty_level(d.text, d3)
 
     today_article = None
     if d:
         today_article = {
             "user_level": '%4.2f' % user_level,
             "text_level": '%4.2f' % text_level,
-            "date": d['date'],
-            "article_title": get_article_title(d['text']),
-            "article_body": get_article_body(d['text']),
-            "source": d["source"],
-            "question": get_question_part(d['question']),
-            "answer": get_answer_part(d['question'])
+            "date": d.date,
+            "article_title": get_article_title(d.text),
+            "article_body": get_article_body(d.text),
+            "source": d.source,
+            "question": get_question_part(d.question),
+            "answer": get_answer_part(d.question)
         }
 
     return existing_articles, today_article
diff --git a/app/model/article.py b/app/model/article.py
index a3b4bf7..ca12a01 100644
--- a/app/model/article.py
+++ b/app/model/article.py
@@ -32,3 +32,14 @@ def get_page_articles(num, size):
             x
             for x in Article.select().order_by(desc(Article.article_id)).page(num, size)
         ]
+
+def get_article():
+    with db_session:
+        return Article.select()[:]
+
+def get_article_by_id(article_id):
+    article_id &= 0xFFFFFFFF  # max 32 bits
+    with db_session:
+        article = Article.select(article_id=article_id)
+        if article:
+            return article.first()