diff --git a/app/helpers/members_helper.rb b/app/helpers/members_helper.rb
index 06b154d36..9dd0bed8c 100644
--- a/app/helpers/members_helper.rb
+++ b/app/helpers/members_helper.rb
@@ -38,7 +38,7 @@ module MembersHelper
       scope = []
     end
     principals = paginateHelper scope,10
-    s = content_tag('ul', project_member_check_box_tags_ex('membership[user_ids][]', principals), :class => 'mb5')
+    s = content_tag('ul', project_member_check_box_tags_ex('membership[user_ids][]', principals), :class => 'mb5', :id => 'principals')
     links = pagination_links_full(@obj_pages, @obj_count, :per_page_links => false, :remote => false, :flag => true){|text, parameters, options|
       link_to text, autocomplete_project_memberships_path(project, parameters.merge(:q => params[:q],:flag => true, :format => 'js')), :remote => true
     }
diff --git a/app/views/members/autocomplete.js.erb b/app/views/members/autocomplete.js.erb
index 01faf7da9..5f21ee38e 100644
--- a/app/views/members/autocomplete.js.erb
+++ b/app/views/members/autocomplete.js.erb
@@ -1,4 +1,9 @@
  <% if @project%>
+    var checked = $("#principals input:checked").size();
+    if(checked > 0)
+    {
+       alert('翻页或搜索后将丢失当前选择的用户数据!');
+    }
     <% if @flag == "true"%>
         $('#principals_for_new_member').html('<%= escape_javascript(render_project_members(@project)) %>');
     <% else%>