diff --git a/app/controllers/courses_controller.rb b/app/controllers/courses_controller.rb
index 0b3e35519..a1bd16e94 100644
--- a/app/controllers/courses_controller.rb
+++ b/app/controllers/courses_controller.rb
@@ -583,6 +583,8 @@ class CoursesController < ApplicationController
 
       # 学生身份的处理
       student_member = course_members.where(role: %i[STUDENT]).take
+
+      # 不存在则创建学生身份
       if params[:roles].include?("STUDENT") && student_member.blank?
         correspond_teacher_exist = CourseMember.exists?(user_id: params[:user_id], is_active: 1, course_id: @course.id, role: %i[CREATOR PROFESSOR ASSISTANT_PROFESSOR])
         new_student = CourseMember.new(user_id: params[:user_id], course_id: @course.id, role: 4)
@@ -597,6 +599,9 @@ class CoursesController < ApplicationController
         student_member.destroy!
         CourseDeleteStudentDeleteWorksJob.perform_later(@course.id, [params[:user_id]])
         # CourseDeleteStudentNotifyJob.perform_later(@course.id, [params[:user_id]], current_user.id)
+      elsif params[:roles].include?("STUDENT") && student_member.present? && !params[:roles].include?("PROFESSOR") && !params[:roles].include?("ASSISTANT_PROFESSOR")
+        # 学生身份存在且学生没有教师身份时更新is_active
+        student_member.update_attributes!(is_active: 1)
       end
 
       normal_status(0, "修改成功")