diff --git a/app/controllers/weapps/courses_controller.rb b/app/controllers/weapps/courses_controller.rb
index d732416ba..07e35b531 100644
--- a/app/controllers/weapps/courses_controller.rb
+++ b/app/controllers/weapps/courses_controller.rb
@@ -108,7 +108,7 @@ class Weapps::CoursesController < Weapps::BaseController
   def change_member_roles
     @course = current_course
     tip_exception("请至少选择一个角色") if params[:roles].reject(&:blank?).blank?
-    tip_exception("不能具有老师、助教两种角色") if params[:roles].include?("PROFESSOR") && params[:roles].include?("ASSISTANT_PROFESSOR")
+    tip_exception("老师、助教角色只能二选一") if params[:roles].include?("PROFESSOR") && params[:roles].include?("ASSISTANT_PROFESSOR")
 
     params[:user_ids].each do |user_id|
       course_members = @course.course_members.where(user_id: user_id)