diff --git a/app/models/archive_file.rb b/app/models/archive_file.rb
index e18cf40..8f6f57b 100644
--- a/app/models/archive_file.rb
+++ b/app/models/archive_file.rb
@@ -128,8 +128,8 @@ class ArchiveFile
       a.instance_variable_set(:@skip_callback, true)
       self.where(:id=>a.id).update_all(:tmp_sort_number => i)
     end
-    max_sort_number = (sorted_archives.count != 0) ? (sort_order == 1 ? sorted_archives.last.tmp_sort_number : sorted_archives.first.tmp_sort_number) : 0
-    ArchiveSortOrder.update_all(:max_sort_number=>max_sort_number,:need_update_sort=>false)
+    min_sort_number, max_sort_number = (sorted_archives.count != 0) ? (sorted_archives.map{|a| a.sort_number.to_i}.minmax) : [0, 0]
+    ArchiveSortOrder.update_all(:min_sort_number=>min_sort_number,:max_sort_number=>max_sort_number,:need_update_sort=>false)
     self.create_indexes
     return max_sort_number
   end
diff --git a/app/models/archive_sort_order.rb b/app/models/archive_sort_order.rb
index 6c06005..c50a892 100644
--- a/app/models/archive_sort_order.rb
+++ b/app/models/archive_sort_order.rb
@@ -2,6 +2,7 @@ class ArchiveSortOrder
   include Mongoid::Document
   field :sort_order, :type => Boolean   # true => asc , false => desc
   field :need_update_sort, :type => Boolean, :default => true
+  field :min_sort_number, :type => Integer, :default => 0
   field :max_sort_number, :type => Integer, :default => 0
   after_initialize do |record|
 	if(!record.new_record? && record.sort_order.nil?)
@@ -44,6 +45,6 @@ class ArchiveSortOrder
 		end
   end
   def get_default_order
-  	self.sort_order ? 0 : self.max_sort_number
+  	self.sort_order ? self.min_sort_number : self.max_sort_number
   end
 end
\ No newline at end of file
diff --git a/app/views/admin/archive_files/_form.html.erb b/app/views/admin/archive_files/_form.html.erb
index e7ce4e6..f1fa7bd 100644
--- a/app/views/admin/archive_files/_form.html.erb
+++ b/app/views/admin/archive_files/_form.html.erb
@@ -16,7 +16,11 @@
   <%= javascript_include_tag "lib/module-area" %>
   <%= javascript_include_tag "lib/jquery-ui-sortable.min" %>
 <% end %>
-
+<% 
+  sort_order = ArchiveSortOrder.first
+  min_sort_number = sort_order.min_sort_number
+  max_sort_number = sort_order.max_sort_number
+%>
   <%#= f.error_messages %>
 <style>
   #fileupload {
@@ -88,6 +92,15 @@
         <div class="controls">
           <% extra_data = f.object.new_record? ? {placeholder: f.object.sort_number, title: f.object.sort_number, value: ''} : {} %>
           <%= f.number_field :sort_number, extra_data %>
+          <p class="muted">
+            <% if sort_order.sort_order %>
+              <%= t("archive.ascending") %>
+            <% else %>
+              <%= t("archive.decending") %>
+            <% end %>
+            ; <%= t('default') %>: <%= sort_order.get_default_order %>
+            </p>
+          <p class="muted"><%= t('archive.min') %>: <%=min_sort_number%>, <%= t('archive.max') %>: <%=max_sort_number%></p>
         </div>
       </div> 
 
diff --git a/config/locales/en.yml b/config/locales/en.yml
index e5f1266..8773562 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -2,6 +2,10 @@ en:
   restful_actions:
     categories_order: Categories Order
   archive:
+    min: "Min"
+    max: "Max"
+    ascending: "Ascending(smallest one is first order)"
+    descending: "Descending(biggest is first order)"
     back_to_index_page: "Back to Index Page"
     delete_selected: "Delete Selected"
     feed_name: Feed Name
diff --git a/config/locales/zh_tw.yml b/config/locales/zh_tw.yml
index 699f16b..b974dca 100644
--- a/config/locales/zh_tw.yml
+++ b/config/locales/zh_tw.yml
@@ -2,6 +2,10 @@ zh_tw:
   restful_actions:
     categories_order: 類別排序
   archive:
+    min: "最小值"
+    max: "最大值"
+    ascending: "升序排列(小的排在最前面)"
+    descending: "降序排列(大的排在最前面)"
     back_to_index_page: "返回列表頁"
     delete_selected: "刪除所選"
     feed_name: Feed 標題