diff --git a/app/controllers/admin/researchs_controller.rb b/app/controllers/admin/researchs_controller.rb
index b04fcc3..d591771 100644
--- a/app/controllers/admin/researchs_controller.rb
+++ b/app/controllers/admin/researchs_controller.rb
@@ -10,7 +10,7 @@ class Admin::ResearchsController < OrbitMemberController
   before_action :allow_admin_only, :only => [:index, :setting]
 
   def index
-    @researchs = Research.order_by(:year=>'desc').page(params[:page]).per(10)
+    @researchs = Research.sort_year_date.page(params[:page]).per(10)
   end
 
   def new
diff --git a/app/controllers/personal_researches_controller.rb b/app/controllers/personal_researches_controller.rb
index 8fa4b38..fb506b4 100644
--- a/app/controllers/personal_researches_controller.rb
+++ b/app/controllers/personal_researches_controller.rb
@@ -1,6 +1,6 @@
 class PersonalResearchesController < ApplicationController
   def index
-    researchs = Research.where(:is_hidden=>false).order_by(:year=>'desc').page(OrbitHelper.params[:page_no]).per(OrbitHelper.page_data_count)
+    researchs = Research.sort_for_frontend.page(OrbitHelper.params[:page_no]).per(OrbitHelper.page_data_count)
     research_list = researchs.collect do |research|
       member = research.member_profile
       path = OrbitHelper.url_to_plugin_show(member.to_param, 'member') rescue '#'
diff --git a/app/models/research.rb b/app/models/research.rb
index 1d7b7e3..4e60417 100644
--- a/app/models/research.rb
+++ b/app/models/research.rb
@@ -30,7 +30,9 @@ class Research
 
   before_validation :add_http
 
-  scope :sort_for_frontend, ->{ where(:is_hidden=>false).order_by(:year => "desc", :publish_date => "desc") }
+  index({year: -1, publish_date: -1, _id: -1}, { unique: false, background: false })
+  scope :sort_year_date, ->{ order_by(:year => "desc", :publish_date => "desc", :id => "desc") }
+  scope :sort_for_frontend, ->{ where(:is_hidden=>false).order_by(:year => "desc", :publish_date => "desc", :id => "desc") }
 
   def get_plugin_data(fields_to_show)
     plugin_datas = []
@@ -69,7 +71,7 @@ class Research
 
     fields_to_show = fields_to_show - fields_to_remove
 
-    plugin_datas = datas.sort_for_frontend.collect.with_index do |p, index|
+    plugin_datas = datas.sort_for_frontend.collect.with_index do |p, idx|
 
       pd_data = []
       fields_to_show.collect do |t|
@@ -85,7 +87,7 @@ class Research
       {
         "pd_datas" => pd_data,
         "type-sort" => (p.research_category.sort_position.to_i rescue -1),
-        "sort-index" => index
+        "sort-index" => idx
       }
 
     end
diff --git a/app/views/plugin/personal_research/_profile.html.erb b/app/views/plugin/personal_research/_profile.html.erb
index 6c08464..fda551c 100644
--- a/app/views/plugin/personal_research/_profile.html.erb
+++ b/app/views/plugin/personal_research/_profile.html.erb
@@ -7,9 +7,9 @@
 
 <%
   if has_access?
-    @researchs = Research.where(member_profile_id: @member.id).desc(:year).page(params[:page]).per(10)
+    @researchs = Research.where(member_profile_id: @member.id).sort_year_date.page(params[:page]).per(10)
   else
-    @researchs = Research.where(is_hidden: false, member_profile_id: @member.id).desc(:year).page(params[:page]).per(10)
+    @researchs = Research.where(is_hidden: false, member_profile_id: @member.id).sort_year_date.page(params[:page]).per(10)
   end
 %>