diff --git a/db/allTlds.db b/db/allTlds.db
new file mode 100644
index 0000000..510ac62
Binary files /dev/null and b/db/allTlds.db differ
diff --git a/functions/ExtractDomain.php b/functions/ExtractDomain.php
new file mode 100644
index 0000000..69c1d7d
--- /dev/null
+++ b/functions/ExtractDomain.php
@@ -0,0 +1,77 @@
+<?php
+
+class tldDB extends SQLite3 {
+    function __construct() {
+        $this->open('./db/allTlds.db'); // 顶级域名数据库
+    }
+}
+
+class extractDomain {
+    private function getAllTlds() { // 获取所有顶级域 含次级域
+        $db = new tldDB;
+        $res = $db->query('SELECT tld FROM `tlds`;');
+        while ($row = $res->fetchArray(SQLITE3_ASSOC)) {
+            $tlds[] = $row['tld'];
+        }
+        return $tlds; // Unicode字符使用Punycode编码
+    }
+
+    private function isDomain($domain) { // 检测是否为域名
+        preg_match('/^(?=^.{3,255}$)[a-zA-Z0-9][-a-zA-Z0-9]{0,62}(\.[a-zA-Z0-9][-a-zA-Z0-9]{0,62})+$/', $domain, $match);
+        return (count($match) != 0);
+    }
+
+    private function getDomain($url) { // 从URL获取域名
+        $url = preg_replace('/^[\w]+:\/\//', '', $url); // 去除协议字段
+        $url = explode('?', $url)[0]; // 去除请求参数内容
+        $domain = explode('/', $url)[0]; // 分离域名
+        return (new Punycode)->encode($domain);
+    }
+
+    private function getTld($domain) { // 搜索域名TLD
+        $tlds = $this->getAllTlds(); // 获取TLD列表
+        foreach ($tlds as $tld) {
+            if (substr($domain, -strlen($tld)) === $tld) { // 匹配测试
+                $target[] = $tld;
+            }
+        }
+        if (count($target) === 0) {
+            return ''; // 匹配不到TLD
+        };
+        $type = 0;
+        foreach ($target as $tld) { // 遍历可能的结果
+            $num = substr_count($tld, '.');
+            if ($type < $num) { // 获取.个数最多的
+                $type = $num;
+                $result = $tld;
+            }
+        }
+        return $result; // 返回网站顶级域名
+    }
+
+    private function getSite($domain, $tld) { // 获取主域名
+        $domain = explode('.', $domain);
+        $num = count($domain) - substr_count($tld, '.');
+        return $domain[$num - 1] . $tld;
+    }
+
+    public function analyse($url) { // 分析域名信息
+        $domain = $this->getDomain($url);
+        if (!$this->isDomain($domain)) { // 域名不合格
+            return array();
+        }
+        $tld = $this->getTld($domain);
+        if ($tld == '') { // 匹配不到TLD
+            return array(
+                'domain' => $domain
+            );
+        }
+        return array(
+            'domain' => $domain,
+            'tld' => $tld,
+            'site' => $this->getSite($domain, $tld)
+        );
+    }
+}
+
+?>
diff --git a/lib/Punycode.php b/functions/Punycode.php
similarity index 100%
rename from lib/Punycode.php
rename to functions/Punycode.php
diff --git a/redisCache.php b/functions/RedisCache.php
similarity index 100%
rename from redisCache.php
rename to functions/RedisCache.php
diff --git a/tgInterface.php b/functions/TgInterface.php
similarity index 100%
rename from tgInterface.php
rename to functions/TgInterface.php
diff --git a/main.php b/main.php
index 7604ba0..70f9b45 100644
--- a/main.php
+++ b/main.php
@@ -1,9 +1,10 @@
 <?php
 
 require_once 'cmdRoute.php';
-require_once 'redisCache.php';
-require_once 'tgInterface.php';
-require_once 'lib/Punycode.php';
+require_once 'functions/Punycode.php';
+require_once 'functions/RedisCache.php';
+require_once 'functions/TgInterface.php';
+require_once 'functions/ExtractDomain.php';
 
 $env = loadEnv();
 $apiToken = $env['BOT_TOKEN'];