diff --git a/app/controllers/users_controller.rb b/app/controllers/users_controller.rb
index 2a10af260..ace4ae903 100644
--- a/app/controllers/users_controller.rb
+++ b/app/controllers/users_controller.rb
@@ -383,6 +383,8 @@ class UsersController < ApplicationController
       #   scope = User.logged.status(@status)
       #   @search_by = params[:search_by] ? params[:search_by][:id] : 0
       #   scope = scope.like(params[:name],@search_by) if params[:name].present?
+    @search_by = params[:search_by] ? params[:search_by] : 0
+
     us = UsersService.new
     scope = us.search_user params
     @user_count = scope.count
diff --git a/app/services/users_service.rb b/app/services/users_service.rb
index 071820ba3..afefc6ff1 100644
--- a/app/services/users_service.rb
+++ b/app/services/users_service.rb
@@ -206,10 +206,18 @@ class UsersService
     }
     scope = User.logged.status(status)
     if params[:is_search_assitant].nil?
-      watcher = User.watched_by(params[:user_id])
-      watcher.push(params[:user_id])
+      #modify by yutao 2015/5/18 没有params[:user_id]参数时去掉"id not in (?)"条件(bug:#2270) start
+      #say by yutao: params[:user_id]这个是指谁发起的搜索么? 如果是 这个值貌似应该从session获取 怪怪的赶脚-_-!
       search_by = params[:search_by] ? params[:search_by] : "0"
-      scope = scope.where("id not in (?)",watcher).like(params[:name],search_by) if params[:name].present?
+      if params[:name].present?
+        if !params[:user_id].nil?
+          watcher = User.watched_by(params[:user_id])
+          watcher.push(params[:user_id])
+          scope = scope.where("id not in (?)",watcher)
+        end
+        scope = scope.like(params[:name],search_by)
+      end
+      #modify by yutao 2015/5/18 没有params[:user_id]参数时去掉"id not in (?)"条件 end
     else
       teachers = searchTeacherAndAssistant(Course.find(params[:course_id]))
       scope = scope.where("id not in (?)",teachers.map{|t| t.user_id}).like(params[:name],search_by) if params[:name].present?