diff --git a/app/models/myshixun.rb b/app/models/myshixun.rb
index 7714a8f2..774caad9 100644
--- a/app/models/myshixun.rb
+++ b/app/models/myshixun.rb
@@ -64,7 +64,7 @@ class Myshixun < ActiveRecord::Base
     time = 0
     self.games.each do |game|
       if game.status == 2
-        time += (game.end_time.to_i - game.open_time.to_i) > 0 ? (game.end_time.to_i - game.open_time.to_i) : 0
+        time += game.cost_time.to_i
       end
     end
     time
diff --git a/app/views/student_work/_shixun_work_show.html.erb b/app/views/student_work/_shixun_work_show.html.erb
index 1f680aed..ee9cd765 100644
--- a/app/views/student_work/_shixun_work_show.html.erb
+++ b/app/views/student_work/_shixun_work_show.html.erb
@@ -55,7 +55,7 @@
             <tr>
               <td>第<%= index + 1 %>关</td>
               <td class="<%= game.status == 2 && game.end_time > @homework.end_time ? 'color-red' : '' %>"><%= game.status == 2 ? format_time(game.end_time) : '- -' %></td>
-              <td><%= game.status == 2 ? game_spend_time(game.end_time.to_i - game.open_time.to_i) : '- -' %></td>
+              <td><%= game.consumes_time %></td>
               <td><%= game.status == 2 ? (game.final_score < 0 ? 0 : cha.score) : '- -' %></td>
             </tr>
           <% end %>