diff --git a/app/controllers/courses_controller.rb b/app/controllers/courses_controller.rb
index 4a26b3c02..9369ba33f 100644
--- a/app/controllers/courses_controller.rb
+++ b/app/controllers/courses_controller.rb
@@ -26,18 +26,22 @@ class CoursesController < ApplicationController
                                                            :base_info, :get_historical_courses, :create_group_by_importing_file,
                                                            :attahcment_category_list,:export_member_scores_excel, :duplicate_course,
                                                            :switch_to_teacher, :switch_to_assistant, :switch_to_student, :exit_course,
-                                                           :informs, :update_informs, :join_excellent_course, :online_learning]
+                                                           :informs, :update_informs, :join_excellent_course, :online_learning,
+                                                           :update_task_position, :tasks_list]
   before_action :teacher_allowed, only: [:update, :destroy, :settings, :search_teacher_candidate,
                                          :transfer_to_course_group, :delete_from_course,
                                          :search_users, :add_students_by_search, :get_historical_courses, :add_teacher_popup, :add_teacher]
   before_action :admin_allowed, only: [:set_invite_code_halt, :set_public_or_private, :change_course_admin,
-                                       :set_course_group, :create_group_by_importing_file, :update_informs]
+                                       :set_course_group, :create_group_by_importing_file, :update_informs,
+                                       :update_task_position, :tasks_list]
   before_action :teacher_or_admin_allowed, only: [:graduation_group_list, :create_graduation_group, :join_graduation_group,
                                                   :change_course_teacher, :export_member_scores_excel, :course_group_list,
                                                   :teacher_application_review, :apply_teachers, :delete_course_teacher]
   before_action :validate_course_name, only: [:create, :update]
   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'
@@ -1117,6 +1121,44 @@ class CoursesController < ApplicationController
     render_ok(count: count, courses: courses.select(:id, :name).as_json)
   end
 
+  def tasks_list
+    case params[:container_type]
+    when 'shixun_homework'
+      @tasks = @course.practice_homeworks
+    when 'common_homework'
+      @tasks = @course.normal_homeworks
+    when 'group_homework'
+      @tasks = @course.group_homeworks
+    when 'exercise'
+      @tasks = @course.exercises
+    when 'poll'
+      @tasks = @course.polls
+    when 'graduation_topic'
+      @tasks = @course.graduation_topics
+    when 'graduation_task'
+      @tasks = @course.graduation_tasks
+    when 'attachment'
+      @tasks = @course.attachments
+    else
+      tip_exception("请指定任务类型")
+    end
+  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")
+      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
+
   private
 
   # Use callbacks to share common setup or constraints between actions.
@@ -1177,6 +1219,48 @@ class CoursesController < ApplicationController
     end
   end
 
+  def course_tasks
+    case params[:container_type]
+    when 'shixun_homework'
+      @tasks = @course.practice_homeworks
+    when 'common_homework'
+      @tasks = @course.normal_homeworks
+    when 'group_homework'
+      @tasks = @course.group_homeworks
+    when 'exercise'
+      @tasks = @course.exercises
+    when 'poll'
+      @tasks = @course.polls
+    when 'graduation_topic'
+      @tasks = @course.graduation_topics
+    when 'graduation_task'
+      @tasks = @course.graduation_tasks
+    when 'attachment'
+      @tasks = @course.attachments
+    else
+      tip_exception("请指定任务类型")
+    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.*,(
           SELECT SUM(student_works.work_score)
diff --git a/app/controllers/homework_commons_controller.rb b/app/controllers/homework_commons_controller.rb
index 5d1733983..eb3576f24 100644
--- a/app/controllers/homework_commons_controller.rb
+++ b/app/controllers/homework_commons_controller.rb
@@ -37,8 +37,6 @@ class HomeworkCommonsController < ApplicationController
       @category = @main_category.course_second_categories.find_by(id: params[:category])
       tip_exception("子目录id有误") if !@category.present?
       @homework_commons = @homework_commons.where(course_second_category_id: params[:category])
-    elsif @homework_type == 4
-      @homework_commons = @homework_commons
     end
     @all_count = @homework_commons.size
 
diff --git a/app/models/course.rb b/app/models/course.rb
index b7bea6ec0..baed1efe6 100644
--- a/app/models/course.rb
+++ b/app/models/course.rb
@@ -32,7 +32,12 @@ class Course < ApplicationRecord
   has_many :teacher_course_members, -> { teachers_and_admin }, class_name: 'CourseMember'
   has_many :teacher_users, through: :teacher_course_members, source: :user
   has_many :course_messages, dependent: :destroy
+
   has_many :homework_commons, dependent: :destroy
+  has_many :normal_homeworks, -> { normals }, class_name: 'HomeworkCommon'
+  has_many :group_homeworks, -> { groups }, class_name: 'HomeworkCommon'
+  has_many :practice_homeworks, -> { practices }, class_name: 'HomeworkCommon'
+
   has_many :homework_group_settings
   has_many :graduation_works, dependent: :destroy
 
diff --git a/app/models/homework_common.rb b/app/models/homework_common.rb
index f198a7143..332aff045 100644
--- a/app/models/homework_common.rb
+++ b/app/models/homework_common.rb
@@ -12,6 +12,7 @@ class HomeworkCommon < ApplicationRecord
 
   belongs_to :course, counter_cache: true
   belongs_to :homework_bank, optional: true
+  belongs_to :user
   has_many :homework_challenge_settings, dependent: :destroy
 
   has_one :homework_commons_shixun, dependent: :destroy
@@ -48,6 +49,9 @@ class HomeworkCommon < ApplicationRecord
   scope :search_homework_type, lambda {|num| where(homework_type:num)}
   scope :unified_setting, -> {where("unified_setting = ? ", 1)}
 
+  scope :normals,  -> {where(homework_type: %i[normal]).order("position desc")}
+  scope :groups,  -> {where(homework_type: %i[group]).order("position desc")}
+  scope :practices,  -> {where(homework_type: %i[practice]).order("position desc")}
 
   # 是否显示参考答案
   def view_answer identity, user_id
diff --git a/app/views/courses/tasks_list.json.jbuilder b/app/views/courses/tasks_list.json.jbuilder
new file mode 100644
index 000000000..29de925a6
--- /dev/null
+++ b/app/views/courses/tasks_list.json.jbuilder
@@ -0,0 +1,7 @@
+json.tasks @tasks.each do |task|
+  json.user_name task.user.real_name
+  json.task_id task.id
+  json.task_name task.name
+  json.category task.course_second_category&.name
+  json.position task.position
+end
\ No newline at end of file
diff --git a/config/routes.rb b/config/routes.rb
index 4e7b19687..80c4d4237 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -352,6 +352,8 @@ Rails.application.routes.draw do
         post 'update_informs'
         get 'online_learning'
         post 'join_excellent_course'
+        get 'tasks_list'
+        post 'update_task_position'
       end
 
       collection do
diff --git a/db/migrate/20190820021047_migrate_course_task_position.rb b/db/migrate/20190820021047_migrate_course_task_position.rb
new file mode 100644
index 000000000..cf1b633bd
--- /dev/null
+++ b/db/migrate/20190820021047_migrate_course_task_position.rb
@@ -0,0 +1,13 @@
+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