diff --git a/app/controllers/courses_controller.rb b/app/controllers/courses_controller.rb
index 01ce1f6e8..8de98f0cb 100644
--- a/app/controllers/courses_controller.rb
+++ b/app/controllers/courses_controller.rb
@@ -912,7 +912,7 @@ class CoursesController < ApplicationController
 
   def left_banner
     @user = current_user
-    @is_teacher = @user.teacher_of_course?(@course)
+    @is_teacher = @user_course_identity < Course::ASSISTANT_PROFESSOR
     @course_modules = @course.course_modules.where(hidden: 0)
     @hidden_modules = @course.course_modules.where(hidden: 1)
     @second_category_type = ["shixun_homework", "graduation", "attachment", "board", "course_group"]