diff --git a/app/controllers/exercises_controller.rb b/app/controllers/exercises_controller.rb
index 18b8fbb2f..b3cf1f0be 100644
--- a/app/controllers/exercises_controller.rb
+++ b/app/controllers/exercises_controller.rb
@@ -1173,7 +1173,7 @@ class ExercisesController < ApplicationController
     ActiveRecord::Base.transaction do
       begin
         @current_user_id = current_user.id
-        @exercise = @exercise.includes(:exercise_questions)
+        @exercise = @exercise
         exercise_ids = [@exercise.id]
         @exercise_status = @exercise.get_exercise_status(current_user.id)
         @course_all_members = @course.students
@@ -1297,7 +1297,7 @@ class ExercisesController < ApplicationController
               if @user_course_identity > Course::ASSISTANT_PROFESSOR
                 tip_exception(403,"无权限操作")
               else
-                if @exercise_users_size.size > 0
+                if @exercise_users_size == 0
                   normal_status(-1,"暂无用户提交")
                 else
                   get_export_users(@exercise,@course,@export_ex_users)
diff --git a/app/controllers/polls_controller.rb b/app/controllers/polls_controller.rb
index 151a2a098..eb03345e7 100644
--- a/app/controllers/polls_controller.rb
+++ b/app/controllers/polls_controller.rb
@@ -924,7 +924,7 @@ class PollsController < ApplicationController
         # 全部页面，需返回
         # @poll_questions_count = @poll_questions.size
         # 分页
-        @poll = @poll.includes(:poll_users,user: :user_extension,)
+        # @poll = @poll.includes(:poll_users,user: :user_extension)
         @poll_users = @poll.poll_users
         @poll_commit_ids = @poll_users.commit_by_status(1).pluck(:user_id) #问卷提交用户的id
         @page  = params[:page] || 1
diff --git a/app/controllers/zips_controller.rb b/app/controllers/zips_controller.rb
index c20546701..a70d4c332 100644
--- a/app/controllers/zips_controller.rb
+++ b/app/controllers/zips_controller.rb
@@ -62,7 +62,7 @@ class ZipsController < ApplicationController
           if default_ex_users_size == 0
             normal_status(-1,"导出失败,暂时没有已提交的学生")
           elsif default_ex_users_size > 100
-            normal_status(-1,"导出数量超过100,请分班导出或联系网站管理员导出")
+            normal_status(-2,"100")
           end
         end
       rescue Exception => e