diff --git a/Gemfile b/Gemfile
index ab7a41a16..34a1a7956 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,6 +9,7 @@ unless RUBY_PLATFORM =~ /w32/
 end
 
 gem 'grape', '~> 0.9.0'
+gem 'grape-entity'
 gem 'seems_rateable', path: 'lib/seems_rateable'
 gem "rails", "3.2.13"
 gem "jquery-rails", "~> 2.0.2"
diff --git a/Gemfile.lock b/Gemfile.lock
index d2ae03453..377ded53e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -107,6 +107,9 @@ GEM
       rack-accept
       rack-mount
       virtus (>= 1.0.0)
+    grape-entity (0.4.4)
+      activesupport
+      multi_json (>= 1.3.2)
     guard (2.6.1)
       formatador (>= 0.2.4)
       listen (~> 2.7)
@@ -303,6 +306,7 @@ DEPENDENCIES
   factory_girl (~> 4.4.0)
   fastercsv (~> 1.5.0)
   grape (~> 0.9.0)
+  grape-entity
   guard-rails (~> 0.5.3)
   guard-spork (~> 1.5.1)
   guard-test (~> 1.0.0)
diff --git a/app/api/mobile/apis/courses.rb b/app/api/mobile/apis/courses.rb
index bd146e235..9409fddd7 100644
--- a/app/api/mobile/apis/courses.rb
+++ b/app/api/mobile/apis/courses.rb
@@ -1,27 +1,57 @@
 module Mobile
+
+  module Entities
+
+    class Course < Grape::Entity
+      def self.course_expose(field)
+        expose field do |f,opt|
+          f[:course][field] || f[:course].__send__(field)
+        end
+      end
+      expose :img_url
+      course_expose :attachmenttype
+      course_expose :class_period
+      course_expose :code
+      course_expose :created_at
+      course_expose :description
+      course_expose :endup_time
+      course_expose :extra
+      course_expose :id
+      course_expose :inherit_members
+      course_expose :is_public
+      course_expose :lft
+      course_expose :location
+      course_expose :name
+      course_expose :open_student
+      # course_expose :password
+      course_expose :rgt
+      course_expose :school_id
+      course_expose :setup_time
+      course_expose :state
+      course_expose :status
+      course_expose :string
+      course_expose :tea_id
+      course_expose :term
+      course_expose :time
+      course_expose :updated_at
+      course_expose :teacher
+    end
+
+  end
+
   class Courses < Grape::API
     resource :courses do
       desc "get all courses"
       params do
+        optional :school_id, type: Integer, desc: 'school number'
         requires :per_page_count, type: Integer
         requires :page, type: Integer, desc: 'current page no'
       end
       get do
-        per_page_option = params[:per_page_count] || 10
-        page_no = params[:page] || 1
-        @courses_all = Course.active.visible.
-          joins("LEFT JOIN #{CourseStatus.table_name} ON #{Course.table_name}.id = #{CourseStatus.table_name}.course_id")
-        @course_count = @courses_all.count
-        @course_pages = Redmine::Pagination::Paginator.new @course_count, per_page_option,page_no 
-        @course_activity_count=Hash.new
-        @courses_all.each do |course|
-          @course_activity_count[course.id]=0
-        end
-        @courses = @courses_all.order("created_at desc")
-        @s_type = 0
-        @courses = @courses.offset(@course_pages.offset).limit(@course_pages.per_page)
-        {status: 0, data: @courses}
-        # @course_activity_count=get_course_activity @courses, @course_activity_count
+        cs = CoursesService.new
+        courses = cs.course_list(params)
+        present :data, courses, with: Entities::Course
+        present :status, 0
       end
 
       desc "Return a course"