diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 54c07d1c1..5ba0db363 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -451,7 +451,7 @@ class ApplicationController < ActionController::Base
 				cpu_limit = config.cpu_limit.presence || 1
 				cpu_request = config.lower_cpu_limit.presence || 0.1
 				memory_limit = config.memory_limit.presence || 1024
-				request_limit = config.resource_limit.presence || 10
+				request_limit = config.request_limit.presence || 10
 				resource_limit = config.resource_limit.presence || 10000
 				container << {:image => mirror.name,
 											:cpuLimit => cpu_limit,
diff --git a/app/controllers/courses_controller.rb b/app/controllers/courses_controller.rb
index 5c3f2e743..bfd7a4464 100644
--- a/app/controllers/courses_controller.rb
+++ b/app/controllers/courses_controller.rb
@@ -41,7 +41,6 @@ class CoursesController < ApplicationController
   before_action :find_board, only: :board_list
   before_action :validate_page_size, only: :mine
   before_action :course_tasks, only: [:tasks_list, :update_task_position]
-  before_action :find_container, only: [:update_task_position]
 
   if RUBY_PLATFORM =~ /linux/
     require 'simple_xlsx_reader'
@@ -1150,17 +1149,20 @@ class CoursesController < ApplicationController
   end
 
   def update_task_position
-    tip_exception("缺少position参数") if params[:position].blank?
-    unless params[:position].to_i == @task.position
-      if params[:position].to_i < @task.position
-        @tasks.where("position < #{@task.position} and position >= ?", params[:position]).update_all("position = position + 1")
-      else
-        @tasks.where("position > #{@task.position} and position <= ?", params[:position]).update_all("position = position - 1")
+    Rails.logger.info("#######task_ids_length#{params[:task_ids].uniq.length}#########task_count:#{@tasks.count}")
+    tip_exception("task_ids参数有误") if params[:task_ids].blank? || params[:task_ids].uniq.length != @tasks.count
+    ActiveRecord::Base.transaction do
+      begin
+        @tasks.each do |task|
+          position = params[:task_ids].reverse.index(task.id).to_i + 1
+          task.update_attributes!(position: position)
+        end
+        normal_status(0, "移动成功")
+      rescue Exception => e
+        uid_logger(e.message)
+        tip_exception(e.message)
+        raise ActiveRecord::Rollback
       end
-      @task.update_attributes(position: params[:position])
-      normal_status(0, "移动成功")
-    else
-      normal_status(-1, "位置没有变化")
     end
   end
 
@@ -1247,24 +1249,24 @@ class CoursesController < ApplicationController
     end
   end
 
-  def find_container
-    case params[:container_type]
-    when 'shixun_homework', 'common_homework', 'group_homework'
-      @task = HomeworkCommon.find_by(id: params[:container_id])
-    when 'exercise'
-      @task = Exercise.find_by(id: params[:container_id])
-    when 'poll'
-      @task = Poll.find_by(id: params[:container_id])
-    when 'graduation_topic'
-      @task = GraduationTopic.find_by(id: params[:container_id])
-    when 'graduation_task'
-      @task = GraduationTask.find_by(id: params[:container_id])
-    when 'attachment'
-      @task = Attachment.find_by(id: params[:container_id])
-    else
-      tip_exception("container_type参数有误")
-    end
-  end
+  # def find_container
+  #   case params[:container_type]
+  #   when 'shixun_homework', 'common_homework', 'group_homework'
+  #     @task = HomeworkCommon.find_by(id: params[:container_id])
+  #   when 'exercise'
+  #     @task = Exercise.find_by(id: params[:container_id])
+  #   when 'poll'
+  #     @task = Poll.find_by(id: params[:container_id])
+  #   when 'graduation_topic'
+  #     @task = GraduationTopic.find_by(id: params[:container_id])
+  #   when 'graduation_task'
+  #     @task = GraduationTask.find_by(id: params[:container_id])
+  #   when 'attachment'
+  #     @task = Attachment.find_by(id: params[:container_id])
+  #   else
+  #     tip_exception("container_type参数有误")
+  #   end
+  # end
 
   def student_act_score group_id, search
     sql_select = %Q{SELECT cm.*,(
diff --git a/app/services/homeworks_service.rb b/app/services/homeworks_service.rb
index a21614efc..78be3b8f9 100644
--- a/app/services/homeworks_service.rb
+++ b/app/services/homeworks_service.rb
@@ -9,6 +9,7 @@ class HomeworksService
 
       homework_detail_manual = HomeworkDetailManual.new
       homework.homework_detail_manual = homework_detail_manual
+      homework.position = course.practice_homeworks.first&.position.to_i + 1
 
       if homework.save!
         homework_detail_manual.save! if homework_detail_manual
diff --git a/db/migrate/20190820021047_migrate_course_task_position.rb b/db/migrate/20190820021047_migrate_course_task_position.rb
index cf1b633bd..f32ac88b1 100644
--- a/db/migrate/20190820021047_migrate_course_task_position.rb
+++ b/db/migrate/20190820021047_migrate_course_task_position.rb
@@ -1,13 +1,5 @@
 class MigrateCourseTaskPosition < ActiveRecord::Migration[5.2]
   def change
     add_column :homework_commons, :position, :integer, :default => 0
-
-    Course.find_each do |course|
-      puts course.id
-      course.practice_homeworks.order("IF(ISNULL(homework_commons.publish_time),0,1), homework_commons.publish_time DESC,
-                                                  homework_commons.created_at DESC").reverse.each_with_index do |homework, index|
-        homework.update_columns(position: index + 1)
-      end
-    end
   end
 end
diff --git a/db/migrate/20190821072722_migrate_course_shixun_homework_position.rb b/db/migrate/20190821072722_migrate_course_shixun_homework_position.rb
new file mode 100644
index 000000000..9a19b12e3
--- /dev/null
+++ b/db/migrate/20190821072722_migrate_course_shixun_homework_position.rb
@@ -0,0 +1,11 @@
+class MigrateCourseShixunHomeworkPosition < ActiveRecord::Migration[5.2]
+  def change
+    Course.find_each do |course|
+      puts course.id
+      course.practice_homeworks.order("IF(ISNULL(homework_commons.publish_time),0,1), homework_commons.publish_time DESC,
+                                                  homework_commons.created_at DESC").reverse.each_with_index do |homework, index|
+        homework.update_columns(position: index + 1)
+      end
+    end
+  end
+end