diff --git a/app/helpers/exercises_helper.rb b/app/helpers/exercises_helper.rb
index 55ade6e7c..6e3ef835e 100644
--- a/app/helpers/exercises_helper.rb
+++ b/app/helpers/exercises_helper.rb
@@ -260,6 +260,7 @@ module ExercisesHelper
 
   def exercise_index_show(exercise,course,is_teacher_or,user)
     # exercise_all_users = exercise.exercise_users
+    # lock_icon 0不出现锁，1和2均出现锁。但是1仅表示私有，可点击，2表示私有，且不点击
     ex_show_text = []
 
     if course.is_end   #课堂停止后，试卷显示为已结束
@@ -280,6 +281,7 @@ module ExercisesHelper
     else
       ex_show_text
     end
+
     if is_teacher_or == 1
       exercise_users_list = exercise.all_exercise_users(user.id)  #当前老师所在班级的全部学生
       unreview_count = exercise_users_list.exercise_unreview.size
@@ -288,7 +290,7 @@ module ExercisesHelper
       exercise_publish_time = ex_pb_time[:publish_time]
       exercise_end_time = ex_pb_time[:end_time]
       current_status = 3
-      lock_icon = 1  #不显示锁图标
+      lock_icon = 1
       if exercise_status == 1
         ex_show_text.push("未发布")
       elsif exercise_status == 3
@@ -302,7 +304,7 @@ module ExercisesHelper
       exercise_publish_time = ex_pb_time[:publish_time]
       exercise_end_time = ex_pb_time[:end_time]
       current_status = exercise.check_user_answer_status(user)
-      lock_icon = 1  #不显示锁图标
+      lock_icon = 1
       if current_status == 4
         ex_show_text.push("未提交")
       end
@@ -314,16 +316,20 @@ module ExercisesHelper
       unreview_count = nil
       if exercise.is_public
         current_status = exercise.check_user_answer_status(user)
-        lock_icon = 1  #非课堂成员，但是试卷为公开的，不加锁
+        lock_icon = 0   #不出现锁
         if current_status == 4
           ex_show_text.push("未提交")
         end
       else
         current_status = 4
-        lock_icon = 0  #显示锁图标
+        lock_icon = 2
       end
     end
 
+    if (course.is_public == 1) && exercise.is_public
+      lock_icon = 0
+    end
+
     if exercise_status > 1
       show_unreview_count = unreview_count
     else
@@ -332,8 +338,6 @@ module ExercisesHelper
 
     if exercise_status == 2 && exercise_end_time.present?
       ex_left_time = how_much_time(exercise_end_time)
-    # elsif exercise_status == 3 && course.end_date.present?
-    #   ex_left_time = how_much_time(course.end_date.to_time)
     else  #已截止后不显示时间
       ex_left_time = nil
     end