diff --git a/functions/ExtractDomain.php b/functions/ExtractDomain.php
index 1c70a7c..87d3e85 100644
--- a/functions/ExtractDomain.php
+++ b/functions/ExtractDomain.php
@@ -1,20 +1,11 @@
 <?php
 
-class tldDB extends SQLite3 {
-    function __construct() {
-        $this->open('./db/allTlds.db'); // 顶级域名数据库
-    }
-}
-
-class icpDB extends SQLite3 {
-    function __construct() {
-        $this->open('./db/icpTlds.db'); // 顶级域名数据库
-    }
-}
-
 class extractDomain {
+    private $tldDB = './db/allTlds.db'; // 顶级域名数据库
+    private $icpDB = './db/icpTlds.db'; // ICP备案数据库
+
     private function getAllTlds() { // 获取所有顶级域 含次级域
-        $db = new tldDB;
+        $db = new SqliteDB($this->tldDB);
         $res = $db->query('SELECT tld FROM `tlds`;');
         while ($row = $res->fetchArray(SQLITE3_ASSOC)) {
             $tlds[] = $row['tld'];
@@ -28,7 +19,7 @@ class extractDomain {
     }
 
     private function getIcpTlds() { // 获取所有可ICP备案的顶级域
-        $db = new icpDB;
+        $db = new SqliteDB($this->icpDB);
         $punycode = new Punycode();
         $res = $db->query('SELECT tld FROM `tlds`;');
         while ($row = $res->fetchArray(SQLITE3_ASSOC)) {
diff --git a/functions/SqliteDB.php b/functions/SqliteDB.php
new file mode 100644
index 0000000..88aa2d5
--- /dev/null
+++ b/functions/SqliteDB.php
@@ -0,0 +1,12 @@
+<?php
+
+class SqliteDB extends SQLite3 { // Sqlite3数据库
+    public function __construct($filename) {
+        $this->open($filename);
+    }
+    public function __destruct() {
+        $this->close();
+    }
+}
+
+?>
\ No newline at end of file
diff --git a/main.php b/main.php
index 70f9b45..b3c1745 100644
--- a/main.php
+++ b/main.php
@@ -2,6 +2,7 @@
 
 require_once 'cmdRoute.php';
 require_once 'functions/Punycode.php';
+require_once 'functions/SqliteDB.php';
 require_once 'functions/RedisCache.php';
 require_once 'functions/TgInterface.php';
 require_once 'functions/ExtractDomain.php';
diff --git a/models/kmsCheck.php b/models/kmsCheck.php
index 7c43d25..1cedcfb 100644
--- a/models/kmsCheck.php
+++ b/models/kmsCheck.php
@@ -1,20 +1,15 @@
 <?php
 
-class kmsDB extends SQLite3 {
-    function __construct() {
-        $this->open('./db/kmsKeys.db'); // KMS密钥数据库
-    }
-}
-
 class kmsKeys {
+    private $kmsDB = './db/kmsKeys.db'; // KMS密钥数据库
     private function getVersionName($type, $version_id) { // 获取对应版本的名称
-        $db = new kmsDB;
+        $db = new SqliteDB($this->kmsDB);
         $res = $db->query('SELECT * FROM `' . $type . '_version` WHERE version_id=' . $version_id . ';');
         return  $res->fetchArray(SQLITE3_ASSOC)['version_name'];
     }
     
     private function getKmsKeys($type) { // 获取所有版本的KMS密钥
-        $db = new kmsDB;
+        $db = new SqliteDB($this->kmsDB);
         $res = $db->query('SELECT * FROM `' . $type . '`;');
         while ($row = $res->fetchArray(SQLITE3_ASSOC)) {
             $index = $row['version'];
diff --git a/models/ntpCheck.php b/models/ntpCheck.php
index f134590..306f2c4 100644
--- a/models/ntpCheck.php
+++ b/models/ntpCheck.php
@@ -1,20 +1,16 @@
 <?php
 
-class ntpDB extends SQLite3 {
-    public function __construct() {
-        $this->open('./db/ntpServer.db'); // NTP服务器数据库
-    }
-}
-
 class ntpList {
+    private $ntpDB = './db/ntpServer.db'; // NTP服务器数据库
+
     private function getListName($list_id) { // 获取对应组的名称
-        $db = new ntpDB;
+        $db = new SqliteDB($this->ntpDB);
         $res = $db->query('SELECT * FROM `ntp_list` WHERE id=' . $list_id . ';');
         return $res->fetchArray(SQLITE3_ASSOC)['name'];
     }
 
     public function getNtpList() { // 获取所有NTP服务器地址
-        $db = new ntpDB;
+        $db = new SqliteDB($this->ntpDB);
         $res = $db->query('SELECT * FROM `ntp_host`;');
         while ($row = $res->fetchArray(SQLITE3_ASSOC)) {
             $index = $row['list_id'];