diff --git a/app/controllers/announcements_controller.rb b/app/controllers/announcements_controller.rb
index 4e25387..0939152 100644
--- a/app/controllers/announcements_controller.rb
+++ b/app/controllers/announcements_controller.rb
@@ -6,24 +6,24 @@ class AnnouncementsController < ApplicationController
     announcements = nil
 
     if params[:keywords]
-      !params[:sort].blank? ? sort = {params[:sort].to_sym=>params[:order]} : sort = {:postdate=>"desc"}
+      !params[:sort].blank? ? sort = {params[:sort].to_sym=>params[:order]} : sort = {:is_top=>"desc",:postdate=>"desc"}
       announcements = Bulletin.where(:title.ne => "").any_of(:title => /#{params[:keywords].to_s}/i).is_approved.order_by(sort).filter_by_categories(["all"]).per(15) if !params[:keywords].nil?
       announcements_count = announcements.count
       keyword = "搜尋標題有關 ' " + params[:keywords] + " '"
       
     elsif params[:unit]
-      !params[:sort].blank? ? sort = {params[:sort].to_sym=>params[:order]} : sort = {:postdate=>"desc"}
+      !params[:sort].blank? ? sort = {params[:sort].to_sym=>params[:order]} : sort = {:is_top=>"desc",:postdate=>"desc"}
       announcements = Bulletin.where(:title.ne => "" ,:cache_dept => params[:unit].to_s).is_approved.order_by(sort).filter_by_categories(["all"]).per(15) if !params[:unit].nil?
       announcements_count = announcements.count
       keyword = "列出由:" + params[:unit] + "發佈的資料"
 
     elsif params[:tag]
-      !params[:sort].blank? ? sort = {params[:sort].to_sym=>params[:order]} : sort = {:postdate=>"desc"}
+      !params[:sort].blank? ? sort = {params[:sort].to_sym=>params[:order]} : sort = {:is_top=>"desc",:postdate=>"desc"}
       announcements = Bulletin.where(:title.ne => "" ,:is_preview.in=>[false,nil]).is_approved.order_by(sort).filter_by_categories(["all"]).filter_by_tags([params[:tag]])
       keyword = "搜尋有關 ' " + Tag.where(:id => params[:tag]).first.name + " '"
 
     elsif params[:category]
-      !params[:sort].blank? ? sort = {params[:sort].to_sym=>params[:order]} : sort = {:postdate=>"desc"}
+      !params[:sort].blank? ? sort = {params[:sort].to_sym=>params[:order]} : sort = {:is_top=>"desc",:postdate=>"desc"}
       category = Category.find_by(:uid => params["category"].split("-").last) rescue nil
       announcements = Bulletin.all.where(:title.ne => "").is_approved.order_by(sort).filter_by_categories([category.id.to_s]) if !category.nil?
       announcements_count = announcements.count
@@ -37,7 +37,7 @@ class AnnouncementsController < ApplicationController
       end
 
     else
-      sort = ( !params[:sort].blank? ? {params[:sort].to_sym=>params[:order]} : {:postdate=>"desc"})
+      sort = ( !params[:sort].blank? ? {params[:sort].to_sym=>params[:order]} : {:is_top=>"desc",:postdate=>"desc"})
 
       # announcements = Bulletin.where(:title.ne => "" ,:is_preview.in=>[false,nil]).can_display.is_approved.order_by(sort).filter_by_categories.filter_by_tags(OrbitHelper.page_tags)
       if OrbitHelper.page_categories.first == "all"