diff --git a/models/problem.js b/models/problem.js
index 29b0e98..731c96f 100644
--- a/models/problem.js
+++ b/models/problem.js
@@ -164,6 +164,13 @@ let model = db.define('problem', {
       key: 'id'
     }
   },
+  publicizer_id: {
+    type: Sequelize.INTEGER,
+    references: {
+      model: 'user',
+      key: 'id'
+    }
+  },
 
   description: { type: Sequelize.TEXT },
   input_format: { type: Sequelize.TEXT },
@@ -208,6 +215,7 @@ class Problem extends Model {
     return Problem.fromRecord(Problem.model.build(Object.assign({
       title: '',
       user_id: '',
+      publicizer_id: '',
       description: '',
 
       input_format: '',
@@ -230,6 +238,7 @@ class Problem extends Model {
 
   async loadRelationships() {
     this.user = await User.fromID(this.user_id);
+    this.publicizer = await User.fromID(this.publicizer_id);
     this.testdata = await TestData.fromID(this.testdata_id);
   }
 
diff --git a/modules/problem.js b/modules/problem.js
index b6e8d6f..371f443 100644
--- a/modules/problem.js
+++ b/modules/problem.js
@@ -200,6 +200,7 @@ app.get('/problem/:id', async (req, res) => {
     let state = await problem.getJudgeState(res.locals.user, false);
 
     problem.tags = await problem.getTags();
+    await problem.loadRelationships();
 
     res.render('problem', {
       problem: problem,
@@ -293,6 +294,7 @@ app.post('/problem/:id/edit', async (req, res) => {
       } else if (id) problem.id = id;
 
       problem.user_id = res.locals.user.id;
+      problem.publicizer_id = res.locals.user.id;
     } else {
       if (!await problem.isAllowedUseBy(res.locals.user)) throw new ErrorMessage('您没有权限进行此操作。');
       if (!await problem.isAllowedEditBy(res.locals.user)) throw new ErrorMessage('您没有权限进行此操作。');
@@ -347,6 +349,7 @@ app.get('/problem/:id/import', async (req, res) => {
       problem.id = id;
       problem.new = true;
       problem.user_id = res.locals.user.id;
+      problem.publicizer_id = res.locals.user.id;
     } else {
       if (!await problem.isAllowedUseBy(res.locals.user)) throw new ErrorMessage('您没有权限进行此操作。');
       if (!await problem.isAllowedEditBy(res.locals.user)) throw new ErrorMessage('您没有权限进行此操作。');
@@ -379,6 +382,7 @@ app.post('/problem/:id/import', async (req, res) => {
       } else if (id) problem.id = id;
 
       problem.user_id = res.locals.user.id;
+      problem.publicizer_id = res.locals.user.id;
     } else {
       if (!await problem.isAllowedUseBy(res.locals.user)) throw new ErrorMessage('您没有权限进行此操作。');
       if (!await problem.isAllowedEditBy(res.locals.user)) throw new ErrorMessage('您没有权限进行此操作。');
@@ -504,6 +508,7 @@ async function setPublic(req, res, is_public) {
     if (!allowedManage) throw new ErrorMessage('您没有权限进行此操作。');
 
     problem.is_public = is_public;
+    problem.publicizer_id = res.locals.user.id;
     await problem.save();
 
     res.redirect(syzoj.utils.makeUrl(['problem', id]));
diff --git a/views/problem.ejs b/views/problem.ejs
index 2c60881..0c5b669 100644
--- a/views/problem.ejs
+++ b/views/problem.ejs
@@ -41,6 +41,16 @@ if (contest) {
         <% } %>
     </div>
 </div>
+<!--<p>
+  由
+    <img style="vertical-align: middle;" src="//cn.gravatar.com/avatar/098be10e0980598d81978267ac70c1fd?s=64&amp;d=mm" width="32" height="32">
+    <a href="/user/1">Menci</a>
+  上传
+  ，由
+    <img style="vertical-align: middle;" src="//cn.gravatar.com/avatar/7d3767f80c1d98af3197062a55d1a6ee?s=64&amp;d=mm" width="32" height="32">
+    <a href="/user/1">samzhang</a>
+  公开
+</p>-->
 <div class="ui grid">
   <div class="row">
     <div class="column">
@@ -74,6 +84,28 @@ if (contest) {
             <% } %>
           <% } %>
         </div>
+        <div class="ui large labels" style="float: right; vertical-align: middle">
+          <div class="ui basic image label" style="font-size: 1.1em; margin-right: 0;">
+            <img src="<%= syzoj.utils.gravatar(problem.user.email, 64) %>">
+            <a href="<%= syzoj.utils.makeUrl(['user', problem.user_id]) %>"><%= problem.user.username %></a>
+            <div class="detail">上传</div>
+          </div>
+          <% if (problem.is_public) {  %>
+            <% if (problem.publicizer) { %>
+              <div class="ui basic image label" style="font-size: 1.1em; margin-left: 0.3em; margin-right: 0;">
+                <img src="<%= syzoj.utils.gravatar(problem.publicizer.email, 64) %>">
+                <a href="<%= syzoj.utils.makeUrl(['user', problem.publicizer_id]) %>"><%= problem.publicizer.username %></a>
+                <div class="detail">公开</div>
+              </div>
+            <% } else { %>
+              <div class="ui basic image label" style="font-size: 1.1em; margin-left: 0.3em; margin-right: 0;">
+                <img src="<%= syzoj.utils.gravatar('', 64) %>">
+                <a>LibreOJ 管理员</a>
+                <div class="detail">公开</div>
+              </div>
+            <% } %>
+          <% } %>
+        </div>
       <% } %>
     </div>
   </div>