diff --git a/app/controllers/exercises_controller.rb b/app/controllers/exercises_controller.rb
index cf67746ac..73bd07954 100644
--- a/app/controllers/exercises_controller.rb
+++ b/app/controllers/exercises_controller.rb
@@ -774,10 +774,11 @@ class ExercisesController < ApplicationController
               ex_group_setting = exercise.exercise_group_settings
               old_exercise_groups = ex_group_setting.find_in_exercise_group("course_group_id", g_course) #试卷的分组设置
               left_course_groups = teacher_course_group_ids - g_course
+              all_left_groups = all_course_group_ids - g_course
               left_exercise_groups = ex_group_setting.find_in_exercise_group("course_group_id", left_course_groups)
               if left_exercise_groups.blank? && exercise.unified_setting
-                if left_course_groups.size > 0 #开始为统一设置，但是立即截止为分班。则创建没有立即截止的班级的exercise_group_setting
-                  left_course_groups.each do |g|
+                if all_left_groups.size > 0 #开始为统一设置，但是立即截止为分班。则创建没有立即截止的班级的exercise_group_setting
+                  all_left_groups.each do |g|
                     ex_group_options = {
                       :exercise_id => exercise.id,
                       :course_group_id => g,