diff --git a/app/controllers/attachments_controller.rb b/app/controllers/attachments_controller.rb
index ec0480c19..c1e5af48a 100644
--- a/app/controllers/attachments_controller.rb
+++ b/app/controllers/attachments_controller.rb
@@ -79,9 +79,7 @@ class AttachmentsController < ApplicationController
     if candown || User.current.admin? || User.current.id == @attachment.author_id
       @attachment.increment_download
       if stale?(:etag => @attachment.digest)
-        if params[:force] == 'true'
-          direct_download
-        else
+        if params[:preview] == 'true'
           convered_file = @attachment.diskfile
           #如果本身不是pdf文件，则先寻找是不是已转换化，如果没有则转化
           unless pdf?(convered_file)
@@ -96,6 +94,8 @@ class AttachmentsController < ApplicationController
           else
             direct_download
           end
+        else
+          direct_download
         end
       end
     else
diff --git a/app/views/files/_course_list.html.erb b/app/views/files/_course_list.html.erb
index 1d5684d31..7f3e426fc 100644
--- a/app/views/files/_course_list.html.erb
+++ b/app/views/files/_course_list.html.erb
@@ -25,7 +25,7 @@
       <% if file.is_public? || User.current.member_of_course?(course) %>
           <div class="re_con_box" id="container_files_<%= file.id %>">
             <div class="">
-              <%= link_to_attachment file, :download => true,:text => truncate(file.filename,length: 35, omission: '...'), :title => file.filename+"\n"+file.description.to_s,:class => "c_dblue f_14 f_b f_l hiddent" %>
+              <%= link_to truncate(file.filename,length: 35, omission: '...'), download_named_attachment_path(file.id, file.filename, preview: true),:title => file.filename+"\n"+file.description.to_s, :style => "overflow: hidden; white-space: nowrap;text-overflow: ellipsis;",:class => "c_dblue f_14 f_b f_l"  %>
               <% if User.current.logged? %>
                   <% if (is_course_teacher(User.current,@course) || file.author_id == User.current.id) && course_contains_attachment?(@course,file) %>
                       <%= link_to("选入我的其他课程",quote_resource_show_course_file_path(@course,file),:class => "f_l re_select c_lorange",:remote => true) if has_course?(User.current,file) %>
@@ -40,7 +40,7 @@
                   <% else %>
                       <%= link_to("选入我的课程",quote_resource_show_course_file_path(@course,file),:class => "f_l re_select c_lorange",:remote => true) if has_course?(User.current,file) %>
                   <% end %>
-                  <%= link_to '下载',download_named_attachment_path(file.id, file.filename, force: true),class: 'f_l re_open'  %>
+                  <%= link_to_attachment file, text: '下载', class: 'f_l re_open' %>
               <% else %>
               <% end %>
             </div>
diff --git a/app/views/files/_project_file_list.html.erb b/app/views/files/_project_file_list.html.erb
index a5152ecdc..81b69d754 100644
--- a/app/views/files/_project_file_list.html.erb
+++ b/app/views/files/_project_file_list.html.erb
@@ -18,7 +18,7 @@
   <% project_attachments.each do |file| %>
       <div class="re_con_box">
         <div class="">
-          <%= link_to_attachment file, :download => true,:text => truncate(file.filename,length: 35, omission: '...'), :title => file.filename+"\n"+file.description.to_s, :style => "overflow: hidden; white-space: nowrap;text-overflow: ellipsis;",:class => "c_dblue f_14 f_b f_l" %>
+          <%= link_to truncate(file.filename,length: 35, omission: '...'), download_named_attachment_path(file.id, file.filename, preview: true),:title => file.filename+"\n"+file.description.to_s, :style => "overflow: hidden; white-space: nowrap;text-overflow: ellipsis;",:class => "c_dblue f_14 f_b f_l"  %>
           <% if User.current.logged? %>
               <% if (manage_allowed || file.author_id == User.current.id) && project_contains_attachment?(project,file) %>
                   <%= link_to(l(:label_slected_to_other_project),quote_resource_show_project_project_file_path(project,file),:class => "f_l re_select",:remote => true) if has_project?(User.current,file) %>
@@ -30,7 +30,7 @@
               <% else %>
                   <%= link_to(l(:label_slected_to_project),quote_resource_show_project_project_file_path(project,file),:class => "f_l re_select",:remote => true) if has_project?(User.current,file) %>
               <% end %>
-              <%= link_to '下载',download_named_attachment_path(file.id, file.filename, force: true),class: 'f_l re_open'  %>
+              <%= link_to_attachment file, text: '下载', class: 'f_l re_open' %>
           <% end %>
         </div>
         <div class="cl"></div>
diff --git a/app/views/stores/index.html.erb b/app/views/stores/index.html.erb
index 6fab364b5..84116a561 100644
--- a/app/views/stores/index.html.erb
+++ b/app/views/stores/index.html.erb
@@ -35,7 +35,7 @@
 					<%= c1.downloads %>
 				</div>
 				<div class="table_cell1 downicon1 filename download_icon" >
-					<%= link_to_attachment c1, {:download => true, :text => image_tag("/images/button/download.png", width: "22px", alt: l(:button_download)) }%>
+					<%= link_to_attachment c1, {:download => true, :text => image_tag("/images/button/download.png", width: "22px", alt: l(:button_download)) }%>c
 				</div>
 			</div>
 		<% end -%>