diff --git a/app/controllers/files_controller.rb b/app/controllers/files_controller.rb
index 7ec796b61..1c05399c4 100644
--- a/app/controllers/files_controller.rb
+++ b/app/controllers/files_controller.rb
@@ -26,7 +26,7 @@ class FilesController < ApplicationController
   before_filter :authorize, :except => [:create,:getattachtype,:quote_resource_show,:search,:searchone4reload,:search_project,:quote_resource_show_project,
                                         :search_tag_attachment,:subfield_upload_file,:search_org_subfield_tag_attachment,
                                         :search_tag_attachment,:quote_resource_show_org_subfield,:find_org_subfield_attache,
-                                        :search_files_in_subfield,:upload_files_menu,:file_hidden,:republish_file]
+                                        :search_files_in_subfield,:upload_files_menu,:file_hidden,:republish_file,:update_file_description]
 
   helper :sort
   include SortHelper
@@ -911,5 +911,10 @@ class FilesController < ApplicationController
 
   def upload_files_menu
 
-end
+  end
+  def update_file_description
+    @attachment = Attachment.find(params[:id])
+    @attachment.description = params[:description]
+    @attachment.save
+  end
 end
diff --git a/app/views/files/_file_description.html.erb b/app/views/files/_file_description.html.erb
new file mode 100644
index 000000000..5d46eaaeb
--- /dev/null
+++ b/app/views/files/_file_description.html.erb
@@ -0,0 +1,5 @@
+<p ondblclick=show_edit_file_description('<%= file.id %>')>
+  资源描述：<% if file.description.blank? %><span style="color:#C5C5BE; cursor:pointer;" title="双击可编辑">点击添加描述</span><% else %><span style="cursor:pointer;" title="双击可编辑"><%= file.description %></span><% end %>
+  <%#= file.description.blank? ? "该资源暂无描述" : file.description %>
+  <%= link_to image_tag("../images/signature_edit.png",width:"12px", height: "12px"), "javascript:void(0);", :onclick => "show_edit_file_description("+file.id.to_s+");"%>
+</p>
\ No newline at end of file
diff --git a/app/views/files/_resource_detail.html.erb b/app/views/files/_resource_detail.html.erb
index 2a03723ca..e7d43a9d4 100644
--- a/app/views/files/_resource_detail.html.erb
+++ b/app/views/files/_resource_detail.html.erb
@@ -35,10 +35,25 @@
         <p class="f_l mb5 fontGrey2">文件大小：<%= number_to_human_size(file.filesize) %></p>
         <p class="fl ml15 fontGrey2">下载<%= file.downloads%>&nbsp;&nbsp;|&nbsp;&nbsp;引用<%= file.quotes.nil? ? 0:file.quotes  %> </p>
       </div>
-      <% unless file.description.blank? %>
+      <%# unless file.description.blank? %>
           <div class="cl"></div>
-          <div class="fontGrey2 mb4">资源描述：<%= file.description %></div>
-      <% end %>
+          <% if User.current.logged? && ((is_course_teacher(User.current,@course) || file.author_id == User.current.id) && course_contains_attachment?(@course,file)) && ((delete_allowed || User.current.id == file.author_id) && file.container_id == @course.id && file.container_type == "Course") %>
+            <div>
+              <div id="file_description_show_<%= file.id %>" class="fontGrey2 mb4">
+                    <%= render :partial => 'files/file_description', :locals => {:file => file} %>
+              </div>
+              <textarea class="homepageSignatureTextarea none" placeholder="请编辑资源描述" id="file_description_edit_<%= file.id %>"
+                        onblur="edit_file_description('<%= update_file_description_course_file_path(@course,file)%>','<%= file.id %>');"><%= file.description %></textarea>
+            </div>
+          <% else %>
+            <div class="fontGrey2 mb4">
+                <% unless file.description.blank? %>
+                    <div class="cl"></div>
+                    <div class="fontGrey2 mb4">资源描述：<%= file.description %></div>
+                <% end %>
+            </div>
+          <% end %>
+      <%# end %>
       <div class="cl"></div>
       <div class="tag_h">
         <!-- container_type = 1 代表是课程里的资源 -->
diff --git a/app/views/files/update_file_description.js.erb b/app/views/files/update_file_description.js.erb
new file mode 100644
index 000000000..2954fb567
--- /dev/null
+++ b/app/views/files/update_file_description.js.erb
@@ -0,0 +1,3 @@
+$("#file_description_show_<%= @attachment.id %>").html("<%= escape_javascript render(:partial => "files/file_description", :locals => {:file => @attachment}) %>");
+$("#file_description_show_<%= @attachment.id %>").show();
+$("#file_description_edit_<%= @attachment.id %>").hide();
diff --git a/config/routes.rb b/config/routes.rb
index e4b462d93..a778a8016 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -975,7 +975,6 @@ RedmineApp::Application.routes.draw do
       match 'delete_softapplications', :via =>  [:get, :post]
     end
   end
-
   resources :groups do
     member do
       get 'autocomplete_for_user'
@@ -1114,6 +1113,7 @@ RedmineApp::Application.routes.draw do
         match "quote_resource_show", :via => [:get]
         get "file_hidden"
         post "republish_file"
+        get "update_file_description"
       end
     end
     resources :memberships, :shallow => true, :controller => 'members', :only => [:index, :show, :new, :create, :update, :destroy] do
diff --git a/public/javascripts/application.js b/public/javascripts/application.js
index 73b667740..0437125e8 100644
--- a/public/javascripts/application.js
+++ b/public/javascripts/application.js
@@ -1480,3 +1480,21 @@ function autoUrl(id){
     }
 }
 
+//编辑资源描述
+function show_edit_file_description(id) {
+    $("#file_description_show_"+id).hide();
+    $("#file_description_edit_"+id).show();
+    $("#file_description_edit_"+id).focus();
+}
+
+//编辑资源描述之后提交
+function edit_file_description(url,id){
+    $.get(
+        url,
+        {id: id ,description: $("#file_description_edit_"+id).val() },
+        function (data) {
+
+        }
+    );
+}
+