diff --git a/app/controllers/courses_controller.rb b/app/controllers/courses_controller.rb
index 9f62a03bb..6c2eb5299 100644
--- a/app/controllers/courses_controller.rb
+++ b/app/controllers/courses_controller.rb
@@ -928,12 +928,14 @@ class CoursesController < ApplicationController
 
               course_message.save!
 
-              role = course_message.content == 2 ? '7' : '9' # 7:助教 9:教师
+              role = course_message.content == 2 ? '9' : '7' # 7:助教 9:教师
               ApplyTeacherRoleJoinCourseNotifyJob.perform_later(current_user.id, course.id, role)
-              message = "#{course_message.content == 2 ? '助教' : '教师'}申请已提交，请等待审核"
+              message = "#{course_message.content == 2 ? '教师' : '助教'}申请已提交，请等待审核"
             else
-              message = "#{existing_course_message.content == 2 ? '助教' : '教师'}申请已提交，请等待审核"
+              message = "#{existing_course_message.content == 2 ? '教师' : '助教'}申请已提交，请等待审核"
             end
+          else
+            message = "您已是课堂成员"
           end
           teacher_role = 1
         end
diff --git a/app/models/user.rb b/app/models/user.rb
index b453f9998..e9d6ce54b 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -234,7 +234,7 @@ class User < ApplicationRecord
 
   # 课堂的老师(创建者、老师、助教)，不用考虑当前身份
   def teacher_of_course_non_active?(course)
-    course.course_members.exists?(user_id: id, role: [1,2,3]) || admin? || business?
+    course.course_members.exists?(user_id: id, role: [1,2,3])
   end
 
   # 是否是教师，课堂管理员或者超级管理员