diff --git a/modules/discussion.js b/modules/discussion.js
index 9ec6014..c700de3 100644
--- a/modules/discussion.js
+++ b/modules/discussion.js
@@ -38,7 +38,7 @@ app.get('/discussion/:type?', async (req, res) => {
       where = { problem_id: { $eq: null } };
     }
     let paginate = syzoj.utils.paginate(await Article.count(where), req.query.page, syzoj.config.page.discussion);
-    let articles = await Article.query(paginate, where, [['public_time', 'desc']]);
+    let articles = await Article.query(paginate, where, [['sort_time', 'desc']]);
 
     for (let article of articles) {
       await article.loadRelationships();
@@ -72,7 +72,7 @@ app.get('/discussion/problem/:pid', async (req, res) => {
 
     let where = { problem_id: pid };
     let paginate = syzoj.utils.paginate(await Article.count(where), req.query.page, syzoj.config.page.discussion);
-    let articles = await Article.query(paginate, where, [['public_time', 'desc']]);
+    let articles = await Article.query(paginate, where, [['sort_time', 'desc']]);
 
     for (let article of articles) await article.loadRelationships();
 
@@ -249,6 +249,10 @@ app.post('/article/:id/comment', async (req, res) => {
 
     await comment.save();
 
+    article.sort_time = syzoj.utils.getCurrentDate();
+    article.comments_num += 1;
+    await article.save();
+
     res.redirect(syzoj.utils.makeUrl(['article', article.id]));
   } catch (e) {
     syzoj.log(e);
@@ -273,6 +277,11 @@ app.post('/article/:article_id/comment/:id/delete', async (req, res) => {
 
     await comment.destroy();
 
+    let article = comment.article;
+    article.comments_num -= 1;
+
+    await article.save();
+
     res.redirect(syzoj.utils.makeUrl(['article', comment.article_id]));
   } catch (e) {
     syzoj.log(e);
diff --git a/views/discussion.ejs b/views/discussion.ejs
index b31037f..4b795d9 100644
--- a/views/discussion.ejs
+++ b/views/discussion.ejs
@@ -47,12 +47,13 @@
   <table class="ui very basic center aligned table">
     <thead>
       <tr>
-        <th class="left aligned" style="width: 50%; ">标题</th>
+        <th class="left aligned" style="width: 40%; ">标题</th>
         <% if (in_problems) { %>
           <th style="width: 20%; ">所属题目</th>
         <% } %>
         <th style="width: 10%; ">作者</th>
-        <th style="width: 20%; ">发表时间</th>
+        <th style="width: 10%; ">回复数</th>
+        <th style="width: 20%; ">最新回复</th>
       </tr>
     </thead>
     <tbody>
@@ -63,7 +64,8 @@
               <td><a href="<%= syzoj.utils.makeUrl(['discussion', 'problem', article.problem_id]) %>"><%= article.problem.title %></a></td>
             <% } %>
             <td><a href="<%= syzoj.utils.makeUrl(['user', article.user_id]) %>"><%= article.user.username %></a><% if (article.user.nameplate) { %><%- article.user.nameplate %><% } %></td>
-            <td><%= syzoj.utils.formatDate(article.public_time) %></td>
+            <td><%= article.comments_num %></td>
+            <td><%= syzoj.utils.formatDate(article.sort_time) %></td>
         </tr>
     <% } %>
     </tbody>