diff --git a/app/helpers/members_helper.rb b/app/helpers/members_helper.rb
index 91e05d6a8..d1292260f 100644
--- a/app/helpers/members_helper.rb
+++ b/app/helpers/members_helper.rb
@@ -33,6 +33,24 @@ module MembersHelper
     s + content_tag('div', content_tag('ul', links), :class => 'pagination_new')
   end
 
+  # add by nwb
+  # 课程可添加的成员列表
+  def render_principals_for_new_course_members(course)
+    scope = Principal.active.sorted.not_member_of_course(course).like(params[:q])
+    principal_count = scope.count
+    principal_pages = Redmine::Pagination::Paginator.new principal_count, 10, params['page']
+    principals = scope.offset(principal_pages.offset).limit(principal_pages.per_page).all
+
+    s = content_tag('div', principals_check_box_tags_ex('membership[user_ids][]', principals), :id => 'principals')
+
+    links = pagination_links_full(principal_pages, principal_count, :per_page_links => false) {|text, parameters, options|
+      link_to text, autocomplete_course_memberships_path(course, parameters.merge(:q => params[:q], :format => 'js')), :remote => true
+    }
+
+    s + content_tag('div', content_tag('ul', links), :class => 'pagination_new')
+  end
+
+
   # 当前申请加入的成员名单
   def render_principals_for_applied_members(project)
     scope = Principal.active.sorted.applied_members(project).like(params[:q])
diff --git a/app/models/principal.rb b/app/models/principal.rb
index efe24f034..024480635 100644
--- a/app/models/principal.rb
+++ b/app/models/principal.rb
@@ -73,6 +73,17 @@ class Principal < ActiveRecord::Base
       where("#{Principal.table_name}.id NOT IN (SELECT DISTINCT user_id FROM #{Member.table_name} WHERE project_id IN (?))", ids)
     end
   }
+
+  scope :not_member_of_course, lambda {|courses|
+    courses = [courses] unless courses.is_a?(Array)
+    if courses.empty?
+      where("1=0")
+    else
+      ids = courses.map(&:id)
+      where("#{Principal.table_name}.id NOT IN (SELECT DISTINCT user_id FROM #{Member.table_name} WHERE course_id IN (?))", ids)
+    end
+  }
+
   scope :sorted, lambda { order(*Principal.fields_for_order_statement)}
 
   scope :applied_members, lambda {|project|
diff --git a/app/views/courses/settings/_members.html.erb b/app/views/courses/settings/_members.html.erb
index 30a3fbceb..0879b7956 100644
--- a/app/views/courses/settings/_members.html.erb
+++ b/app/views/courses/settings/_members.html.erb
@@ -76,7 +76,7 @@
             <%= javascript_tag "observeSearchfield('principal_search', null, '#{ escape_javascript autocomplete_course_memberships_path(@course, :format => 'js') }')" %>
 
             <div id="principals_for_new_member">
-              <%= render_principals_for_new_members(@course) %>
+              <%= render_principals_for_new_course_members(@course) %>
             </div>
             <!--show the roles which will select-->
             <p style="padding-top: 5px"><%= l(:label_role_plural) %>:
diff --git a/app/views/members/autocomplete.js.erb b/app/views/members/autocomplete.js.erb
index ba98983d3..e7a52f7f3 100644
--- a/app/views/members/autocomplete.js.erb
+++ b/app/views/members/autocomplete.js.erb
@@ -1 +1,5 @@
+ <% if @project%>
 $('#principals_for_new_member').html('<%= escape_javascript(render_principals_for_new_members(@project)) %>');
+ <% elsif @course%>
+ $('#principals_for_new_member').html('<%= escape_javascript(render_principals_for_new_course_members(@course)) %>');
+ <%end%>