diff --git a/app/controllers/exercises_controller.rb b/app/controllers/exercises_controller.rb
index 15f5c67d9..e5d9fc495 100644
--- a/app/controllers/exercises_controller.rb
+++ b/app/controllers/exercises_controller.rb
@@ -379,6 +379,7 @@ class ExercisesController < ApplicationController
 
   #试卷的提交设置
   def commit_setting
+    tip_exception("助教无权限修改本试卷") if @user_course_identity == Course::ASSISTANT_PROFESSOR && !@exercise.assistant_auth
     ActiveRecord::Base.transaction do
       error_count = 0 # 判断循环里是否有已发布/已截止的，且时间更改了的分班。
       # course_group_ids = @course.teacher_course_group_ids(current_user.id)  #当前老师的班级id数组
@@ -398,6 +399,7 @@ class ExercisesController < ApplicationController
       choice_random = params[:choice_random] ? true : false
       score_open = params[:score_open] ? true : false #分数是否公开
       answer_open = params[:answer_open] ? true : false #答案是否公开
+      assistant_auth = params[:assistant_auth] ? true : false # 助教权限
 
       # 统一设置或者分班为0，则更新试卷，并删除试卷分组
       if unified_setting || (course_group_ids.size == 0)
@@ -426,7 +428,8 @@ class ExercisesController < ApplicationController
             :answer_open => answer_open,
             :exercise_status => exercise_status_n,
             :publish_time => params_publish_time,
-            :end_time => params_end_time
+            :end_time => params_end_time,
+            :assistant_auth => assistant_auth
           }
           @exercise.update!(exercise_params)
           @exercise.exercise_group_settings.destroy_all
diff --git a/app/views/exercises/common_header.json.jbuilder b/app/views/exercises/common_header.json.jbuilder
index d43d7c3f8..7843c260e 100644
--- a/app/views/exercises/common_header.json.jbuilder
+++ b/app/views/exercises/common_header.json.jbuilder
@@ -1,5 +1,5 @@
 json.course_is_end @course.is_end # true表示已结束，false表示未结束
-json.extract! @exercise, :id,:exercise_name,:exercise_description,:show_statistic
+json.extract! @exercise, :id,:exercise_name,:exercise_description,:show_statistic,:assistant_auth
 json.time (@user_left_time.to_i / 60)
 
 json.exercise_status @ex_status
diff --git a/app/views/exercises/index.json.jbuilder b/app/views/exercises/index.json.jbuilder
index c8f6cd380..e1c8bd3a4 100644
--- a/app/views/exercises/index.json.jbuilder
+++ b/app/views/exercises/index.json.jbuilder
@@ -2,7 +2,7 @@
 if @exercises_count > 0
   json.exercises do
     json.array! @exercises do |exercise|
-      json.extract! exercise, :id, :exercise_name,:is_public,:created_at
+      json.extract! exercise, :id, :exercise_name,:is_public,:created_at,:assistant_auth
       if @is_teacher_or == 2
         second_left = get_exercise_left_time(exercise,@current_user_)
         json.time second_left.present? ? (second_left / 60) : nil
diff --git a/db/migrate/20200311082736_add_auth_to_exercise.rb b/db/migrate/20200311082736_add_auth_to_exercise.rb
new file mode 100644
index 000000000..fceb96e0c
--- /dev/null
+++ b/db/migrate/20200311082736_add_auth_to_exercise.rb
@@ -0,0 +1,5 @@
+class AddAuthToExercise < ActiveRecord::Migration[5.2]
+  def change
+    add_column :exercises, :assistant_auth, :boolean, default: 1
+  end
+end