diff --git a/f_config/DB.php b/f_config/DB.php
deleted file mode 100644
index b7839b58..00000000
--- a/f_config/DB.php
+++ /dev/null
@@ -1,8 +0,0 @@
-<?php
-namespace sammo;
-
-if(AppConf::getRoot()->isExists()) {
-    require_once(AppConf::getRoot()->getSettingFile());
-} else {
-    Error('설정 파일이 없습니다. 설정을 먼저 하십시요!');
-}
diff --git a/f_config/config.php b/f_config/config.php
index 47940f91..78dbd4eb 100644
--- a/f_config/config.php
+++ b/f_config/config.php
@@ -3,7 +3,7 @@ namespace sammo;
 
 ob_start();
 require(__dir__.'/../vendor/autoload.php');
-require_once(__dir__.'/func.php');
+require_once(__dir__.'/../f_func/func.php');
 
 
 
diff --git a/f_install/j_create_admin.php b/f_install/j_create_admin.php
index 2a2d36c0..02bf93ca 100644
--- a/f_install/j_create_admin.php
+++ b/f_install/j_create_admin.php
@@ -25,14 +25,13 @@ if(strlen($password)!=128){
     ]);
 }
 
-if(!AppConf::getRoot()->isExists()){
+if(!class_exists('RootDB')){
     Json::die([
         'result'=>false,
         'reason'=>'DB 설정이 완료되지 않았습니다.'
     ]);
 }
 
-require(__DIR__.'/../f_config/DB.php');
 $rootDB = RootDB::db();
 
 //초기 관리자 계정은 딱 하나만 있어야하므로, 중요함.
diff --git a/f_install/j_install_status.php b/f_install/j_install_status.php
index e3d91703..cdda4c26 100644
--- a/f_install/j_install_status.php
+++ b/f_install/j_install_status.php
@@ -16,13 +16,12 @@ function dbSQLFail($params){
     ]);
 }
 
-if(!AppConf::getRoot()->isExists()){
+if(!class_exists('RootDB')){
     Json::die([
         'step'=>'config'
     ]);
 }
 
-require(__DIR__.'/../f_config/DB.php');
 $rootDB = RootDB::db();
 
 $rootDB->throw_exception_on_nonsql_error = false;
diff --git a/f_install/j_setup_db.php b/f_install/j_setup_db.php
index 9d3afffd..b8f177b7 100644
--- a/f_install/j_setup_db.php
+++ b/f_install/j_setup_db.php
@@ -45,7 +45,7 @@ if(file_exists(ROOT.'/d_setting/RootDB.php') && is_dir(ROOT.'/d_setting/RootDB.p
     ]);
 }
 
-if(AppConf::getRoot()->isExists()){
+if(class_exists('RootDB')){
     Json::die([
         'result'=>false,
         'reason'=>'이미 RootDB.php 파일이 있습니다'
diff --git a/i_entrance/admin_userlist.php b/i_entrance/admin_userlist.php
index a8462738..d149a938 100644
--- a/i_entrance/admin_userlist.php
+++ b/i_entrance/admin_userlist.php
@@ -2,7 +2,6 @@
 namespace sammo;
 
 require_once('_common.php');
-require_once(ROOT.'/f_config/DB.php');
 
 $session = Session::requireLogin();
 $db = RootDB::db();
diff --git a/i_entrance/entrance.php b/i_entrance/entrance.php
index 75c4a988..e04eb3ea 100644
--- a/i_entrance/entrance.php
+++ b/i_entrance/entrance.php
@@ -2,7 +2,7 @@
 namespace sammo;
 
 require_once('_common.php');
-require_once(ROOT.'/f_config/DB.php');
+
 $session = Session::requireLogin();
 
 $templates = new \League\Plates\Engine('templates');
diff --git a/i_entrance/j_change_password.php b/i_entrance/j_change_password.php
index a00b3f29..dd02cc7f 100644
--- a/i_entrance/j_change_password.php
+++ b/i_entrance/j_change_password.php
@@ -2,7 +2,6 @@
 namespace sammo;
 
 require_once('_common.php');
-require_once(ROOT.'/f_config/DB.php');
 
 $session = Session::Instance();
 
diff --git a/i_entrance/j_delete_me.php b/i_entrance/j_delete_me.php
index cbf7d165..f9ee7408 100644
--- a/i_entrance/j_delete_me.php
+++ b/i_entrance/j_delete_me.php
@@ -2,7 +2,6 @@
 namespace sammo;
 
 require_once('_common.php');
-require_once(ROOT.'/f_config/DB.php');
 
 $session = Session::Instance();
 
diff --git a/i_entrance/j_get_user_info.php b/i_entrance/j_get_user_info.php
index 1b1f5b72..9c9dfb24 100644
--- a/i_entrance/j_get_user_info.php
+++ b/i_entrance/j_get_user_info.php
@@ -2,7 +2,6 @@
 namespace sammo;
 
 require_once('_common.php');
-require_once(ROOT.'/f_config/DB.php');
 
 $session = Session::Instance();
 
diff --git a/i_entrance/j_icon_change.php b/i_entrance/j_icon_change.php
index 45f93cc1..bedb2c2e 100644
--- a/i_entrance/j_icon_change.php
+++ b/i_entrance/j_icon_change.php
@@ -2,7 +2,6 @@
 namespace sammo;
 
 require_once('_common.php');
-require_once(ROOT.'/f_config/DB.php');
 
 $session = Session::Instance();
 
diff --git a/i_entrance/j_icon_delete.php b/i_entrance/j_icon_delete.php
index 80ea67ae..f86a2079 100644
--- a/i_entrance/j_icon_delete.php
+++ b/i_entrance/j_icon_delete.php
@@ -2,7 +2,6 @@
 namespace sammo;
 
 require_once('_common.php');
-require_once(ROOT.'/f_config/DB.php');
 
 $session = Session::Instance();
 
diff --git a/i_entrance/j_logout.php b/i_entrance/j_logout.php
index fc02c9fb..746cb035 100644
--- a/i_entrance/j_logout.php
+++ b/i_entrance/j_logout.php
@@ -2,7 +2,7 @@
 namespace sammo;
 
 require_once('_common.php');
-require_once(ROOT.'/f_config/DB.php');
+
 $session = Session::requireLogin();
 
 // 외부 파라미터
diff --git a/i_entrance/j_server_change_status.php b/i_entrance/j_server_change_status.php
index c73d63ae..e0541bdf 100644
--- a/i_entrance/j_server_change_status.php
+++ b/i_entrance/j_server_change_status.php
@@ -2,7 +2,7 @@
 namespace sammo;
 
 require_once('_common.php');
-require_once(ROOT.'/f_config/DB.php');
+
 $session = Session::requireLogin();
 
 
diff --git a/i_entrance/j_server_get_admin_status.php b/i_entrance/j_server_get_admin_status.php
index 8d98eddd..574ae28c 100644
--- a/i_entrance/j_server_get_admin_status.php
+++ b/i_entrance/j_server_get_admin_status.php
@@ -4,7 +4,6 @@ namespace sammo;
 // 외부 파라미터
 
 require_once('_common.php');
-require_once(ROOT.'/f_config/DB.php');
 $session = Session::requireLogin();
 
 $result = [];
diff --git a/i_entrance/j_server_get_status.php b/i_entrance/j_server_get_status.php
index 997f968d..ec1f1d76 100644
--- a/i_entrance/j_server_get_status.php
+++ b/i_entrance/j_server_get_status.php
@@ -2,7 +2,6 @@
 namespace sammo;
 
 require_once('_common.php');
-require_once(ROOT.'/f_config/DB.php');
 
 // 외부 파라미터
 $response['server'] = [];
diff --git a/i_entrance/member/Get.php b/i_entrance/member/Get.php
index 430d0215..4dd05c29 100644
--- a/i_entrance/member/Get.php
+++ b/i_entrance/member/Get.php
@@ -2,7 +2,6 @@
 namespace sammo;
 
 require_once('_common.php');
-require_once(ROOT.'/f_config/DB.php');
 $session = Session::requireLogin();
 
 
diff --git a/i_entrance/member/Post.php b/i_entrance/member/Post.php
index d0386fb2..de211d0f 100644
--- a/i_entrance/member/Post.php
+++ b/i_entrance/member/Post.php
@@ -2,7 +2,6 @@
 namespace sammo;
 
 require_once('_common.php');
-require_once(ROOT.'/f_config/DB.php');
 $session = Session::requireLogin();
 
 // 외부 파라미터
diff --git a/index.php b/index.php
index e6845d7a..05f23bc1 100644
--- a/index.php
+++ b/index.php
@@ -3,13 +3,11 @@ namespace sammo;
 
 require('_common.php');
 
-if(!AppConf::getRoot()->isExists()){
+if(!class_exists('RootDB')){
     header ('Location:install.php');
     die();
 }
 
-require(ROOT.'/f_config/DB.php');
-
 
 $session = Session::Instance();
 
diff --git a/j_login.php b/j_login.php
index a24352e3..460799e2 100644
--- a/j_login.php
+++ b/j_login.php
@@ -2,7 +2,6 @@
 namespace sammo;
 
 require_once('_common.php');
-require_once(ROOT.'/f_config/DB.php');
 
 
 
diff --git a/oauth_kakao/j_change_pw.php b/oauth_kakao/j_change_pw.php
index 0693c635..e0ad9076 100644
--- a/oauth_kakao/j_change_pw.php
+++ b/oauth_kakao/j_change_pw.php
@@ -2,7 +2,6 @@
 namespace sammo;
 
 require('_common.php');
-require(ROOT.'/f_config/DB.php');
 
 use \kakao\Kakao_REST_API_Helper as Kakao_REST_API_Helper;
 
diff --git a/oauth_kakao/j_login_oauth.php b/oauth_kakao/j_login_oauth.php
index 94de4d4b..15938654 100644
--- a/oauth_kakao/j_login_oauth.php
+++ b/oauth_kakao/j_login_oauth.php
@@ -2,8 +2,6 @@
 namespace sammo;
 
 require('_common.php');
-require(ROOT.'/f_config/DB.php');
-require('kakao.php');
 
 use \kakao\Kakao_REST_API_Helper as Kakao_REST_API_Helper;
 
diff --git a/src/sammo/AppConf.php b/src/sammo/AppConf.php
index a4a5a139..d88fdb0a 100644
--- a/src/sammo/AppConf.php
+++ b/src/sammo/AppConf.php
@@ -7,7 +7,6 @@ if(!defined('ROOT')){
 
 class AppConf{
     private static $serverList = null;
-    private static $rootSetting = null;
 
     public static function getList(){
         if(self::$serverList === null){
@@ -22,10 +21,29 @@ class AppConf{
         return self::$serverList;
     }
 
-    public static function getRoot(){
-        if(self::$rootSetting === null){
-            self::$rootSetting = new Setting(ROOT);
+    /**
+     * DB 객체 생성
+     * 
+     * @return \MeekroDB 
+     */
+    public static function requireRootDB(){
+        if(!class_exists('RootDB')){
+            trigger_error('RootDB.php가 설정되지 않았습니다.', E_USER_ERROR);
+            die();
         }
-        return self::$rootSetting;
+        return RootDB::db();
+    }
+
+    /**
+     * DB 객체 생성
+     * 
+     * @return \MeekroDB 
+     */
+    public static function requireDB(){
+        if(!class_exists('DB')){
+            trigger_error('DB.php가 설정되지 않았습니다.', E_USER_ERROR);
+            die();
+        }
+        return DB::db();
     }
 }
\ No newline at end of file