diff --git a/app/models/site_construct.rb b/app/models/site_construct.rb
index d52f2bc..eddb422 100644
--- a/app/models/site_construct.rb
+++ b/app/models/site_construct.rb
@@ -1,8 +1,9 @@
 class SiteConstruct
   include Mongoid::Document
   include Mongoid::Timestamps
-
-  SERVER_TYPES = SiteServer.all.map{|s| s.server_name}
+  def self.server_types
+    SiteServer.all.map{|s| s.server_name}
+  end
   SITE_TYPES = ["School","Gravity"]
 
   field :server_type
diff --git a/app/models/site_server.rb b/app/models/site_server.rb
index bbb6c16..6e1afd7 100644
--- a/app/models/site_server.rb
+++ b/app/models/site_server.rb
@@ -6,8 +6,21 @@ class SiteServer
   include OrbitModel::Status
   field :server_name , type: String ,default: ''
   field :domain_name , type: String ,default: ''
+  field :domain_names, type: Array, default: []
   field :ip , type: String ,default: ''
   field :account , type: String ,default: ''
   field :password , type: String ,default: ''
   field :active , type: Boolean ,default: true
+  def domain_names
+    if self.domain_name != ''
+      [self.domain_name]
+    else
+      super
+    end
+  end
+  before_save do
+    if self.domain_name != '' && self.domain_names.length !=0
+      self.domain_name = ''
+    end
+  end
 end
\ No newline at end of file
diff --git a/app/views/admin/site_panel/_form.html.erb b/app/views/admin/site_panel/_form.html.erb
index d05e293..2db14f3 100644
--- a/app/views/admin/site_panel/_form.html.erb
+++ b/app/views/admin/site_panel/_form.html.erb
@@ -23,7 +23,16 @@
         <div class="control-group">
           <%= f.label :server_type ,"Server", :class => "control-label muted" %>
           <div class="controls">
-            <%= f.select :server_type, SiteConstruct::SERVER_TYPES %>
+            <%= f.select :server_type, SiteConstruct.server_types %>
+          </div>
+        </div>
+
+        <div class="control-group">
+          <%= f.label :root_domain ,"Root Domain", :class => "control-label muted" %>
+          <div class="controls">
+            <%= select_tag :root_domain, 
+                options_for_select(SiteServer.first.domain_names.collect{ |u| [u, u] }), 
+                :id => "root_domain" %>
           </div>
         </div>
 
@@ -53,8 +62,8 @@
         <div class="control-group">
           <%= f.label :domain_name ,"Domain Name", :class => "control-label muted" %>
           <div class="controls">
-            <%= f.text_field :domain_name, :id => "domain_name" %>
-            <div class="hint">schoolname-deptname.pending.rulingcom.com eg: nctu-eed.pending.rulingcom.com</div>
+            <%= f.text_field :domain_name, :id => "domain_name",:disabled => 'disabled' %>
+            <!--<div class="hint">schoolname-deptname.pending.rulingcom.com eg: nctu-eed.pending.rulingcom.com</div>-->
           </div>
         </div>
 
@@ -89,9 +98,12 @@
 <script type="text/javascript">
   var domain_name_relations = {};
   <% SiteServer.all.each do |server_server| %>
-    domain_name_relations['<%= server_server.server_name %>'] = '<%= server_server.domain_name %>';
+    domain_name_relations['<%= server_server.server_name %>'] = <%= server_server.domain_names.inspect.html_safe %>;
   <% end %>
   console.log(domain_name_relations);
+  function change_domain_name(domain_name){
+    $("#domain_name").val($("#site_name").val().replace("_","-") + "."+domain_name);
+  }
   $("#school_name").on("blur",function(){
     var school = $(this).val().toLowerCase();
     if($("#site_name").val() == ""){
@@ -114,18 +126,31 @@
       $("#path").val("/home/rulingcom/" + type);
     }
   })
-  $('#site_construct_server_type').click(function(){
-    var domain_name = domain_name_relations[$(this).val()];
-    $("#domain_name").val($("#site_name").val().replace("_","-") + "."+domain_name);
-    $('#domain_name').siblings('.hint').html('schoolname-deptname.'+domain_name+' eg: nctu-eed.'+domain_name);
+  $("#root_domain").change(function(){
+    change_domain_name($(this).val());
+  })
+  $('#site_construct_server_type').change(function(){
+    var domain_name = domain_name_relations[$(this).val()][0];
+    var domain_names = domain_name_relations[$(this).val()];
+    $("#root_domain").find('option').remove()
+    $.each(domain_names,function(i,v){
+      var o = new Option(v, v);
+      /// jquerify the DOM object 'o' so we can use the html method
+      $(o).html(v);
+      $("#root_domain").append(o);
+    })
+    if ($("#site_name").val()!=''){
+      change_domain_name(domain_name);
+    }
+    //$('#domain_name').siblings('.hint').html('schoolname-deptname.'+domain_name+' eg: nctu-eed.'+domain_name);
   })
   $("#site_name").on("blur",function(){
     var val = $(this).val(),
         type = $("#site_construct_site_type").val(),
         school = $("#school_name").val(),
-        domain_name = domain_name_relations[$('#site_construct_server_type').val()];
-    $('#domain_name').siblings('.hint').html('schoolname-deptname.'+domain_name+' eg: nctu-eed.'+domain_name);
-    $("#domain_name").val(val.replace("_","-") + "."+domain_name);
+        domain_name = $("#root_domain").val();
+    //$('#domain_name').siblings('.hint').html('schoolname-deptname.'+domain_name+' eg: nctu-eed.'+domain_name);
+    change_domain_name(domain_name);
     $("#db_name").val(val);
     type = (type == "School" ? "school_sites" : "orbit_sites" );
     if(school != ""){
diff --git a/app/views/admin/site_panel/edit_server_info.html.erb b/app/views/admin/site_panel/edit_server_info.html.erb
index f1daace..b83aa1c 100644
--- a/app/views/admin/site_panel/edit_server_info.html.erb
+++ b/app/views/admin/site_panel/edit_server_info.html.erb
@@ -1,6 +1,26 @@
 <% content_for :page_specific_css do %>
   <%= stylesheet_link_tag "lib/main-forms" %>
-<% end %>
+<% end 
+   delete_domain_button = button_tag("#{t('delete_')} domain", class: 'btn btn-danger', 
+                                              :onclick=> "delete_domain(this)",
+                                              :type => 'button')
+%>
+<script type="text/javascript">
+  function add_domain(ele){
+    var tp=$(ele);
+    var tp2=tp.parents('.controls').eq(0).find('.group');
+    var tp3=tp2.find('.domain_name').eq(0).clone();
+    tp3.val('');
+    tp2.append('<br>');
+    tp2.append(tp3);
+    tp2.append('<%= delete_domain_button %>')
+  }
+  function delete_domain(ele){
+    $(ele).prev('input').remove()
+    $(ele).prev('br').remove()
+    $(ele).remove()
+  }
+</script>
 <%= form_for @site_server ,:url=>{:action=>"edit_server_info",:type=>'update'},:method=>:post, :html => {:class=>"form-horizontal main-forms"} do |f|%>
   <fieldset>
     <input type='hidden' name='id' value='<%=@site_server.id.to_s%>'/>
@@ -43,7 +63,20 @@
           <div class="control-group">
             <label class="control-label muted" for="domain_name">Domain name:</label>
             <div class="controls">
-              <%= f.text_field :domain_name,{:id=>'domain_name'} %>
+              <div class="group">
+              <% 
+              tp = @site_server.domain_names
+              tp << '' if tp.length == 0
+              tp.each_with_index do |domain_name,i| %>
+                <%= '<br>'.html_safe if i !=0 %>
+                <%= text_field_tag "site_server[domain_names][]",domain_name,{:id=>nil,:class=>"domain_name"} %>
+                <% delete_domain_button if i !=0 %>
+              <% end %>
+              </div>
+              <%= f.button "#{t('add')} domain", class: 'btn btn-info', 
+                  :onclick=> "add_domain(this)",
+                  :type => 'button'
+              %>
             </div>
           </div>
           <div class="control-group">