diff --git a/app/views/shixuns/_add_collaborators.html.erb b/app/views/shixuns/_add_collaborators.html.erb
index 44fb5419f..c9bd4543c 100644
--- a/app/views/shixuns/_add_collaborators.html.erb
+++ b/app/views/shixuns/_add_collaborators.html.erb
@@ -18,7 +18,7 @@
               <label for="all_student_select" class="ml10">
                 <span class="span1 edu-txt-w120 task-hide font-bd">姓名</span>
                 <span class="span3 edu-txt-w120 task-hide font-bd">用户ID</span>
-                <span class="span2 edu-txt-w90 task-hide font-bd">职位</span>
+                <span class="span2 edu-txt-w80 task-hide font-bd">职位</span>
                 <span class="span3 edu-txt-w160 task-hide font-bd">单位</span>
               </label>
             </p>
diff --git a/app/views/shixuns/_add_collaborators_list.html.erb b/app/views/shixuns/_add_collaborators_list.html.erb
index e219ceb7a..71fab81e4 100644
--- a/app/views/shixuns/_add_collaborators_list.html.erb
+++ b/app/views/shixuns/_add_collaborators_list.html.erb
@@ -8,7 +8,7 @@
               <label for="choose_course_teacher_<%= user.id %>" style="top:0px">
                 <a href="<%= user_path(user) %>" target="_blank" class="task-hide color-grey3 fl span1 edu-txt-w120"><%= user.show_real_name %></a>
                 <span class="task-hide fl color-grey edu-txt-w120 span2"><%= user.login %></span>
-                <span class="task-hide fl color-grey edu-txt-w100 span2"><%= user.identity %></span>
+                <span class="task-hide fl color-grey edu-txt-w90 span2"><%= user.identity %></span>
                 <span class="span3 color-grey fl edu-txt-w160 task-hide"><%= user.user_extensions.school ? user.user_extensions.school.name : "" %></span>
                 </label>
             </li>
diff --git a/public/stylesheets/css/edu-common.css b/public/stylesheets/css/edu-common.css
index 4bf7c1872..30b12ad56 100644
--- a/public/stylesheets/css/edu-common.css
+++ b/public/stylesheets/css/edu-common.css
@@ -242,6 +242,7 @@ a.edu-txt-w130,.edu-txt-w130{ width:130px; display: inline-block;text-align: cen
 a.edu-txt-w120,.edu-txt-w120{ width:120px; display: inline-block;text-align: center}
 a.edu-txt-w100,.edu-txt-w100{ width:100px; display: inline-block;text-align: center}
 a.edu-txt-w90,.edu-txt-w90{ width:90px; display: inline-block;text-align: center}
+a.edu-txt-w80,.edu-txt-w80{ width:80px; display: inline-block;text-align: center}
 .edu-txt-w50{ width:50px;}
 .edu-w245{ width: 245px; }
 .overellipsis{overflow: hidden;white-space: nowrap;text-overflow: ellipsis;}