diff --git a/app/views/courses/settings/_members.html.erb b/app/views/courses/settings/_members.html.erb
index 5432db8e6..ab0f20257 100644
--- a/app/views/courses/settings/_members.html.erb
+++ b/app/views/courses/settings/_members.html.erb
@@ -82,7 +82,11 @@
             <p style="padding-top: 5px"><%= l(:label_role_plural) %>:
               <% roles.each do |role| %>
 
-                  <label><%= radio_button_tag 'membership[role_ids][]', role.id %> <%= h role %></label>
+                  <% if role.id == 10 %> <!-- 默认学生角色  -->
+                    <label><%= radio_button_tag 'membership[role_ids][]', role.id, true %> <%= h role %></label>
+                  <% else %>
+                    <label><%= radio_button_tag 'membership[role_ids][]', role.id %> <%= h role %></label>
+                  <% end %>
               <% end %></p>
 
             <p><%= submit_tag l(:button_add), :id => 'member-add-submit' %></p>
diff --git a/app/views/members/autocomplete.js.erb b/app/views/members/autocomplete.js.erb
index 5ef01c04d..d1e7a884b 100644
--- a/app/views/members/autocomplete.js.erb
+++ b/app/views/members/autocomplete.js.erb
@@ -1,6 +1,11 @@
  <% if @project%>
 $('#principals_for_new_member').html('<%= escape_javascript(render_principals_for_new_members(@project)) %>');
  <% elsif @course%>
+ var checked = $("#principals input:checked").size();
+ if(checked > 0)
+ {
+   alert('翻页或搜索后将丢失当前选择的用户数据!');
+ }
  $('#principals_for_new_member').html('<%= escape_javascript(render_principals_for_new_course_members(@course)) %>');
  <%end%>
  var collection=$("#principals_for_new_member").children("#principals").children("label");