diff --git a/app/controllers/exercise_controller.rb b/app/controllers/exercise_controller.rb
index c3e5d9a67..77302c5db 100644
--- a/app/controllers/exercise_controller.rb
+++ b/app/controllers/exercise_controller.rb
@@ -419,7 +419,7 @@ class ExerciseController < ApplicationController
   def commit_exercise
     # 老师不需要提交
     if User.current.allowed_to?(:as_teacher,@course)
-      
+      @exercise.update_attributes(:show_result => params[:exercise][:show_result])
       redirect_to exercise_url(@exercise)
       # REDO: 提示提交成功
     else