diff --git a/app/controllers/managements_controller.rb b/app/controllers/managements_controller.rb
index b43e70df..d1450ef6 100644
--- a/app/controllers/managements_controller.rb
+++ b/app/controllers/managements_controller.rb
@@ -3127,6 +3127,7 @@ end
     notice = SystemUpdateNotice.last
     if notice.present? && notice.end_time > Time.now
       notice.update_attributes(:end_time => params[:end_time], :start_time => params[:start_time], :subject => params[:subject], :notes => params[:notes])
+      UserSystemNotice.where(:notice_type => notice.notice_type).destroy_all
     else
       notice_type = UserSystemNotice.find_by_sql("select max(notice_type) as max_notice_type from user_system_notices").first.try(:max_notice_type).to_i + 1
       SystemUpdateNotice.create(:end_time => params[:end_time], :start_time => params[:start_time], :subject => params[:subject], :notes => params[:notes], :notice_type => notice_type)
diff --git a/app/controllers/users_controller.rb b/app/controllers/users_controller.rb
index 2e958f6f..e44a170b 100644
--- a/app/controllers/users_controller.rb
+++ b/app/controllers/users_controller.rb
@@ -2372,7 +2372,7 @@ class UsersController < ApplicationController
     if @user.certification == 3
       @user.update_column('certification', 0)
       @noticed = true
-      notice = SystemUpdateNotice.first
+      notice = SystemUpdateNotice.last
       if notice.present? && notice.end_time > Time.now && notice.start_time >= Time.now - 21600 && User.current.user_system_notices.where(:notice_type => notice.notice_type).count == 0
         @noticed_update = true
       end
diff --git a/app/views/layouts/_logined_header.html.erb b/app/views/layouts/_logined_header.html.erb
index f48b5615..ee3a571d 100644
--- a/app/views/layouts/_logined_header.html.erb
+++ b/app/views/layouts/_logined_header.html.erb
@@ -117,7 +117,7 @@
         <% end %>
 
 
-        <% notice = SystemUpdateNotice.first %>
+        <% notice = SystemUpdateNotice.last %>
         <% if @noticed_update || ((User.current.certification == 1 || params[:controller] != "welcome") && notice.present? && notice.end_time > Time.now && notice.start_time >= (Time.now - 21600) && User.current.user_system_notices.where(:notice_type => notice.notice_type).count == 0) %>
           var htmlvalue = "<%= escape_javascript(render :partial => 'account/user_update_notice', :locals => {:notice => notice})%>";
           pop_box_new(htmlvalue, 500, 380);
diff --git a/app/views/managements/update_notice.html.erb b/app/views/managements/update_notice.html.erb
index 0cabe548..c0e1f254 100644
--- a/app/views/managements/update_notice.html.erb
+++ b/app/views/managements/update_notice.html.erb
@@ -11,8 +11,10 @@
     <tr>
       <%= form_for '', :url => edit_update_notice_managements_path(), :html => {:id => 'edit_update_notice_form', :method => "post"} do |f| %>
         <td>
-          <input type="text" placeholder="请选择开始时间" readonly name="start_time" value="<%= format_time @notice.try(:start_time) %>" class="winput-240-35 mt10 mb15" id="notice_begin_time"/><br/>
-          <input type="text" placeholder="请选择结束时间" readonly name="end_time" value="<%= format_time @notice.try(:end_time) %>" class="winput-240-35 mb10" id="notice_end_time"/>
+          <input type="text" placeholder="请选择开始时间" readonly name="start_time" value="<%= @notice.try(:end_time) && @notice.try(:end_time) > Time.now ? format_time(@notice.try(:start_time)) : "" %>"
+                 class="winput-240-35 mt10 mb15" id="notice_begin_time"/><br/>
+          <input type="text" placeholder="请选择结束时间" readonly name="end_time" value="<%= @notice.try(:end_time) && @notice.try(:end_time) > Time.now ? format_time(@notice.try(:end_time)) : "" %>"
+                 class="winput-240-35 mb10" id="notice_end_time"/>
         </td>
         <td>
           <input class="winput-240-35" name="subject" value="<%= @notice.try(:subject) ? @notice.try(:subject) : '  educoder系统升级暂停服务通知' %>" id="upgradeTitleText"/>
diff --git a/app/views/my/account.html.erb b/app/views/my/account.html.erb
index 87f0403e..e70c3555 100644
--- a/app/views/my/account.html.erb
+++ b/app/views/my/account.html.erb
@@ -107,7 +107,7 @@
         <% end %>
       <% end %>
 
-      <% notice = SystemUpdateNotice.first %>
+      <% notice = SystemUpdateNotice.last %>
       <% if User.current.certification == 1 && notice.present? && notice.end_time > Time.now && notice.start_time >= (Time.now - 21600) && User.current.user_system_notices.where(:notice_type => notice.notice_type).count == 0 %>
         var htmlvalue = "<%= escape_javascript(render :partial => 'account/user_update_notice', :locals => {:notice => notice})%>";
         pop_box_new(htmlvalue, 500, 380);