diff --git a/vj4/locale/zh_CN.yaml b/vj4/locale/zh_CN.yaml
index 6b22cc73b..e192c6e44 100644
--- a/vj4/locale/zh_CN.yaml
+++ b/vj4/locale/zh_CN.yaml
@@ -636,3 +636,7 @@ Lucky: 手气不错
 Pick a problem randomly based on current filter: 根据当前过滤条件随机选择一道题
 No problem.: 没有题目。
 Initialize: 初始化
+Background Image: 背景图片
+'{} is a moderator of this domain.': '{}是这个域的管理者之一。'
+He: 他
+She: 她
diff --git a/vj4/model/adaptor/setting.py b/vj4/model/adaptor/setting.py
index ae0e1b29e..ca81d783d 100644
--- a/vj4/model/adaptor/setting.py
+++ b/vj4/model/adaptor/setting.py
@@ -32,6 +32,8 @@
             desc='If left blank, the built-in template of the corresponding language will be used.')]
 
 ACCOUNT_SETTINGS = [
+    Setting('setting_info', 'background_img', int, range=constant.setting.BACKGROUND_RANGE,
+            ui='select', name='Background Image'),
     Setting('setting_info', 'gravatar', str,
             name='Gravatar Email', desc='We use Gravatar to present your avatar icon.'),
     Setting('setting_info', 'qq', str,
diff --git a/vj4/ui/constant/setting.js b/vj4/ui/constant/setting.js
index a2a919d65..6b3e0ec44 100644
--- a/vj4/ui/constant/setting.js
+++ b/vj4/ui/constant/setting.js
@@ -15,3 +15,28 @@ export const FUNCTION_RANGE = {
   1: 'Enabled',
 };
 attachObjectMeta(FUNCTION_RANGE, 'intKey', true);
+
+export const BACKGROUND_RANGE = {
+  1: '1',
+  2: '2',
+  3: '3',
+  4: '4',
+  5: '5',
+  6: '6',
+  7: '7',
+  8: '8',
+  9: '9',
+  10: '10',
+  11: '11',
+  12: '12',
+  13: '13',
+  14: '14',
+  15: '15',
+  16: '16',
+  17: '17',
+  18: '18',
+  19: '19',
+  20: '20',
+  21: '21',
+};
+attachObjectMeta(BACKGROUND_RANGE, 'intKey', true);
diff --git a/vj4/ui/templates/discussion_detail.html b/vj4/ui/templates/discussion_detail.html
index 0a73452d8..454216247 100644
--- a/vj4/ui/templates/discussion_detail.html
+++ b/vj4/ui/templates/discussion_detail.html
@@ -39,7 +39,7 @@
         </form></li>
       {% endif %}
         <li>
-          <a href="#"><span class="icon icon-warning"></span> {{ _('Report') }}</a>
+          <a href="{{ reverse_url('about') }}#contact"><span class="icon icon-warning"></span> {{ _('Report') }}</a>
         </li>
       </ul>
     </div>
@@ -70,16 +70,17 @@ <h1 class="section__title">{{ _('{0} comments').format(drcount) }}</h1>
     </div>
   </div>
   <div class="medium-3 columns">
+    {% with udoc = udict[ddoc['owner_uid']] %}
     <div class="section side">
-      <div class="profile__bg user-profile-bg--12"></div>
+      <div class="profile__bg user-profile-bg--{{ vj4.model.adaptor.setting.UserSetting(udoc).get_setting('background_img') }}"></div>
       <div class="section__body">
         <div class="media sidebar-user-profile">
           <div class="media__left">
-            <img src="{{ udict[ddoc['owner_uid']]['gravatar']|gravatar_url }}" width="80" height="80" class="medium user-profile-avatar">
+            <img src="{{ udoc['gravatar']|gravatar_url }}" width="80" height="80" class="medium user-profile-avatar">
           </div>
           <div class="media__body">
             <p>
-              {{ user.render_inline(udict[ddoc['owner_uid']], dudict[ddoc['owner_uid']], avatar=false, modbadge=false) }}
+              {{ user.render_inline(udoc, dudict[ddoc['owner_uid']], avatar=false, modbadge=false) }}
             </p>
           </div>
         </div>
@@ -106,6 +107,7 @@ <h1 class="section__title">{{ _('{0} comments').format(drcount) }}</h1>
           </div>
         </div>
       </div>
+      {% endwith %}
     </div>
     {% if vnode['doc_type'] == vj4.model.document.TYPE_PROBLEM %}
       {% with pdoc=vnode, owner_udoc=udict[vnode['owner_uid']] %}
diff --git a/vj4/ui/templates/user_detail.html b/vj4/ui/templates/user_detail.html
index 1b245454a..065de59c9 100644
--- a/vj4/ui/templates/user_detail.html
+++ b/vj4/ui/templates/user_detail.html
@@ -4,7 +4,7 @@
 <div class="row">
   <div class="medium-9 columns">
     <div class="section">
-      <div class="profile-header user-profile-bg--{{ bg }}">
+      <div class="profile-header user-profile-bg--{{ vj4.model.adaptor.setting.UserSetting(udoc).get_setting('background_img') }}">
         <div class="profile-header__content clearfix">
           <div class="media">
             <div class="media__left">
@@ -22,6 +22,9 @@ <h1>{{ udoc['uname'] }} <small>({{ _('UID') }}: {{ udoc['_id'] }}) {% if handler
               {% endif %}
               </p>
               <p>{{ _('Solved {0} problems, RP: {1} (No. {2})').format(dudoc['num_accept']|default(0), dudoc['rp']|default(0.0)|round(2), dudoc['rank']|default('?')) }}</p>
+              {% if handler.dudoc_has_perm(udoc, dudoc, vj4.model.builtin.PERM_MOD_BADGE) %}
+              <p>{{ _('{} is a moderator of this domain.').format(_('She' if handler.get_udoc_setting(udoc, 'gender') == 1 else 'He')) }}</p>
+              {% endif %}
             </div>
           </div>
         </div>