diff --git a/Gemfile b/Gemfile
index 375667dc..aa6a2ba9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -22,7 +22,6 @@ gem 'mini_magick'
 gem 'mongoid', '> 2.1', '< 3.0.0'
 gem 'mongoid-tree', :require => 'mongoid/tree'
 gem "mongo_session_store-rails3"
-gem 'mysql2'
 gem 'nokogiri'
 
 
diff --git a/config/initializers/nccu_ldap_connection.rb b/config/initializers/nccu_ldap_connection.rb
deleted file mode 100644
index 00e03367..00000000
--- a/config/initializers/nccu_ldap_connection.rb
+++ /dev/null
@@ -1,16 +0,0 @@
-#encoding: utf-8
-require 'mysql2'
-
-$nccu_ldap_connection
-
-module  NccuLdapConnection
-  BASE = 'ou=People,dc=nccu,dc=edu,dc=tw'
-
-  def self.establish
-      $nccu_ldap_connection = Net::LDAP.new
-      $nccu_ldap_connection.port =LDAP_CONFIG["port"]
-      $nccu_ldap_connection.host = LDAP_CONFIG["host"]
-      $nccu_ldap_connection.authenticate(LDAP_CONFIG["authenticate_info"],LDAP_CONFIG["authenticate_pwd"]) 
-  end
-
-end
\ No newline at end of file