diff --git a/app/controllers/courses_controller.rb b/app/controllers/courses_controller.rb
index de24f7a8e..b08ba2dbd 100644
--- a/app/controllers/courses_controller.rb
+++ b/app/controllers/courses_controller.rb
@@ -1299,8 +1299,10 @@ class CoursesController < ApplicationController
       begin
         @all_members = @course.students
         search = params[:search] ? "#{params[:search].strip}" : ""   #用户名或学生学号id搜索
-        group_id = params[:group_id]  #分班的班级id
-        @all_members = @all_members.where(course_group_id: group_id.map(&:to_i)) unless group_id.blank?
+        if params[:group_id].present?
+          group_ids = params[:group_id].is_a?(String) ? [params[:group_id].to_i] : params[:group_id].map(&:to_i)
+          @all_members = @all_members.where(course_group_id: group_ids)
+        end
         unless search.blank?
           @all_members = @all_members.joins(user: [:user_extension]).where('concat(users.lastname, users.firstname) like ? or user_extensions.student_id like ?',"%#{search}%","%#{search}%")
         end