diff --git a/app/controllers/attachments_controller.rb b/app/controllers/attachments_controller.rb
index e41e2a43..46be2ef4 100644
--- a/app/controllers/attachments_controller.rb
+++ b/app/controllers/attachments_controller.rb
@@ -359,7 +359,7 @@ class AttachmentsController < ApplicationController
     saved = @attachment.save
     respond_to do |format|
       format.js
-      format.json { render json: { attachment_id: @attachment.id, url: download_attachment_path(@attachment.id) } }
+      format.json { render json: { attachment_id: @attachment.id, url: "/api/attachments/#{@attachment.id}"} }
       format.api {
         if saved
           render :action => 'upload', :status => :created
@@ -380,7 +380,7 @@ class AttachmentsController < ApplicationController
     render json: {
         success: saved ? 1 : 0, #  | 1,           // 0 表示上传失败，1 表示上传成功
         message: "上传信息：#{ @attachment.errors.full_messages.join(',') }",
-        url: download_attachment_path(@attachment.id),        # 上传成功时才返回
+        url: "/api/attachments/#{@attachment.id}",        # 上传成功时才返回
         attachment_id: @attachment.id
     }
   end
@@ -413,7 +413,7 @@ class AttachmentsController < ApplicationController
     render json: {
      success: saved ? 1 : 0, #  | 1,           // 0 表示上传失败，1 表示上传成功
      message: "上传失败：#{ @attachment.errors.full_messages.join(',') }",
-     url: download_attachment_path(@attachment.id)        # 上传成功时才返回
+     url: "/api/attachments/#{@attachment.id}"        # 上传成功时才返回
     }
   end
 
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 6bd9bc21..aac2a843 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -5691,7 +5691,7 @@ end
 def download_named_attachment_url_without_domain(id, filename, option={})
   attachment_id = (Attachment === id ? id.id : id)
   # Setting.protocol + "://" + Setting.host_name + "/attachments/download/" + attachment_id.to_s + "/" + filename
-  Setting.protocol + "://" + Setting.host_name + "/attachments/" + attachment_id.to_s
+  "/api/attachments/" + attachment_id.to_s
 end
 
 def named_attachment_url_without_domain(id, filename, option={})
diff --git a/app/views/libraries/_form.html.erb b/app/views/libraries/_form.html.erb
index c71bc7c1..c5bb2ecd 100644
--- a/app/views/libraries/_form.html.erb
+++ b/app/views/libraries/_form.html.erb
@@ -73,7 +73,7 @@
             <div class="surfacePlot ml60 library-cover-select" data-tip-down="上传图片" onclick="$('#library-cover-file').click();">
               <img src="/images/educoder/unite.png" class="marginuploading <%= cover_exists ? 'hidden' : '' %>" style="<%= cover_exists ? 'display:none' : '' %>"/>
               <div class="library-cover-perview" style="<%= cover_exists ? '' : 'display:none' %>">
-                <% cover_url = cover_exists ? download_attachment_path(@library.cover_id) : '' %>
+                <% cover_url = cover_exists ? "/api/attachments/#{@library.cover.id}" : '' %>
                 <img src="<%= cover_url %>" width="122px" height="93px"/>
               </div>
             </div>
diff --git a/app/views/libraries/_library_list.html.erb b/app/views/libraries/_library_list.html.erb
index b5551966..4d5a52ab 100644
--- a/app/views/libraries/_library_list.html.erb
+++ b/app/views/libraries/_library_list.html.erb
@@ -2,7 +2,7 @@
   <% if @libraries.present? %>
     <% @libraries.each do |library| %>
       <li class="library_list_item">
-        <% image_url = library.cover.present? ? download_attachment_path(library.cover.id) : 'educoder/library-default-cover.png' %>
+        <% image_url = library.cover.present? ? "/api/attachments/#{library.cover.id}" : 'educoder/library-default-cover.png' %>
         <%= image_tag(image_url, width: 120, height: 90, class: 'mr15 mt3 radius4') %>
         <div class="flex1">
           <p class="clearfix mb15 lineh-40 mt10">
diff --git a/app/views/managements/_training_item.html.erb b/app/views/managements/_training_item.html.erb
index ceb1f055..50e856fa 100644
--- a/app/views/managements/_training_item.html.erb
+++ b/app/views/managements/_training_item.html.erb
@@ -8,7 +8,7 @@
 <td><%= training.training_payinfo.try(:info) %></td>
 <td>
   <% if training.training_payinfo.try(:attachment_id).present? %>
-    <img src="<%= download_attachment_path(training.training_payinfo.try(:attachment_id)) %>" width="50px" class="training_image"/>
+    <img src="/api/attachments/<%= training.training_payinfo.try(:attachment_id) %>" width="50px" class="training_image"/>
   <% end %>
 </td>
 <td><%= format_time training.created_at %></td>