diff --git a/app/controllers/members_controller.rb b/app/controllers/members_controller.rb
index ba312c74a..aaaa4484d 100644
--- a/app/controllers/members_controller.rb
+++ b/app/controllers/members_controller.rb
@@ -109,7 +109,7 @@ class MembersController < ApplicationController
         end
         if params[:flag]
           unless members.present? && members.all? {|m| m.valid? }
-            flash[:error] = members.collect {|m| m.errors.full_messages}.flatten.uniq.join(', ')
+            flash[:error] = members.empty? ? l(:label_user_role_null) :members.collect {|m| m.errors.full_messages}.flatten.uniq.join(', ')
           else
             flash[:notice] = l(:label_invite_success)
           end
diff --git a/config/locales/projects/zh.yml b/config/locales/projects/zh.yml
index 2442f8e4f..bd547c37e 100644
--- a/config/locales/projects/zh.yml
+++ b/config/locales/projects/zh.yml
@@ -195,6 +195,7 @@ zh:
   label_invite_email_tips: 输入好友邮箱地址，Trustie会自动为该邮箱注册用户！
   notice_registed_success: 您输入的邮箱为空或者该邮箱已被注册!
   label_email_format_error: 您所填写的电子邮件格式不正确
+  label_user_role_null: 用户和角色不能留空！
   label_send_email: 免费发送
   label_input_email: 请输入邮箱地址
   
diff --git a/config/locales/zh.yml b/config/locales/zh.yml
index d3d89104c..f3879421a 100644
--- a/config/locales/zh.yml
+++ b/config/locales/zh.yml
@@ -129,7 +129,7 @@ zh:
   field_priority: 优先级
   field_fixed_version: 目标版本
   field_user: 用户
-  field_principal: 用户/用户组
+  field_principal: 用户
   field_role: 角色
   field_homepage: 主页
   field_time: 课时
diff --git a/public/stylesheets/application.css b/public/stylesheets/application.css
index 742202bea..ca8f0c3b6 100644
--- a/public/stylesheets/application.css
+++ b/public/stylesheets/application.css
@@ -70,7 +70,7 @@ a:hover.subnav_green{ background:#14ad5a;}
 
 /*简介*/
 .project_intro{ width:220px; padding:5px 0px 10px 10px; background:#fff; color:#6d6d6d;}
-.course_description{max-height: 105px;overflow:hidden;}
+.course_description{max-height: 103px;overflow:hidden;}
 .course_description_none{max-height: none;}
 .lg-foot{ border:1px solid #e8eef2; color: #929598; text-align:center; width:220px; height:23px; cursor:pointer;}
 .lg-foot:hover{ color:#787b7e;}