diff --git a/backend/ipip.php b/backend/ipip.php
new file mode 100644
index 0000000..0de3bfd
--- /dev/null
+++ b/backend/ipip.php
@@ -0,0 +1,96 @@
+<?php
+
+// 数据来源：IPIP免费数据库 ipipfree.ipdb
+// 初始化类：new IPDB($fileName)
+// 请求方式：getDistrict($ip)
+// 返回格式：
+// {
+//     '0': 国家
+//     '1': 省、直辖市
+//     '2': 市
+// }
+// 注：仅国内省市数据
+// 
+// 请求版本：getVersion()
+// 返回格式：YYYYMMDD
+
+class IPDB {
+    private $fp; // 文件指针
+    private $meta; // 元数据信息
+    private $nodeCount;
+    private $nodeOffset;
+
+    public function __construct($fileName) { // 构造函数
+        $this->fp = fopen($fileName, 'rb');
+        $metaSize = unpack('N', fread($this->fp, 4))[1]; // 获取元数据长度
+        $this->meta = json_decode(fread($this->fp, $metaSize), 1); // 读取元数据信息
+        $this->nodeCount = $this->meta['node_count'];
+        $this->nodeOffset = 4 + $metaSize;
+    }
+
+    public function __destruct() { // 析构函数
+        if ($this->fp) {
+            fclose($this->fp);
+        }
+    }
+
+    public function getVersion() { // 获取版本信息
+        return date("Ymd", $this->meta['build']);
+    }
+
+    public function getDistrict($ip) { // 获取地区信息
+        $node = $this->getNode($ip);
+        if ($node <= 0) {
+            return NULL;
+        }
+        return explode("\t", $this->getData($node));
+    }
+
+    private function getNode($ip) { // 获取节点编号
+        $node = 0;
+        $binary = inet_pton($ip);
+        for ($i = 0; $i < 96 && $node < $this->nodeCount; $i++) {
+            if ($i >= 80) {
+                $node = $this->readNode($node, 1);
+            } else {
+                $node = $this->readNode($node, 0);
+            }
+            if ($node > $this->nodeCount) {
+                return 0;
+            }
+        }
+        for ($i = 0; $i < 32; $i++) {
+            if ($node >= $this->nodeCount) {
+                break;
+            }
+            $node = $this->readNode($node, 1 & ((0xFF & ord($binary[$i >> 3])) >> 7 - ($i % 8)));
+        }
+        if ($node <= $this->nodeCount) {
+            return NULL;
+        }
+        return $node;
+    }
+
+    private function readNode($node, $index) {
+        return unpack('N', $this->read($node * 8 + $index * 4, 4))[1];
+    }
+
+    private function getData($node) { // 根据节点编号获取信息
+        $offset = $node + $this->nodeCount * 7;
+        $bytes = $this->read($offset, 2);
+        $size = unpack('N', str_pad($bytes, 4, "\x00", STR_PAD_LEFT))[1];
+        $offset += 2;
+        return $this->read($offset, $size);
+    }
+
+    private function read($offset, $length) { // 从指定位置读取指定长度
+        if ($length <= 0) {
+            return NULL;
+        }
+        if (fseek($this->fp, $offset + $this->nodeOffset) === 0) {
+            return fread($this->fp, $length);
+        }
+    }
+}
+
+?>
\ No newline at end of file
diff --git a/backend/ipipfree.ipdb b/backend/ipipfree.ipdb
new file mode 100644
index 0000000..4f68906
Binary files /dev/null and b/backend/ipipfree.ipdb differ
diff --git a/backend/queryInfo.php b/backend/queryInfo.php
index 48df7f4..3a7140d 100644
--- a/backend/queryInfo.php
+++ b/backend/queryInfo.php
@@ -1,9 +1,10 @@
 <?php
 
-include("getInfo.php");
+// include("getInfo.php");
 include("country.php");
 include("qqwry.php");
 include("ipinfo.php");
+include("ipip.php");
 
 function getIPInfo($ip) {
     $qqwry = new QQWry('qqwry.dat');
@@ -20,6 +21,8 @@ function getIPInfo($ip) {
         $info['isp'] = $specialInfo;
     } else {
         $data = IPinfo::getInfo($ip);
+        $IPIP = new IPDB('ipipfree.ipdb');
+        $addr = $IPIP->getDistrict($ip);
         $country = getCountry($data['country']);
         $info['ip'] = $data['ip'];
         $info['as'] = $data['as'];
@@ -30,6 +33,14 @@ function getIPInfo($ip) {
         $info['timezone'] = $data['timezone'];
         $info['loc'] = $data['loc'];
         $info['isp'] = $data['isp'];
+        if ($addr[0] == '中国') {
+            $info['country'] = 'CN - China（中国）';
+            $info['timezone'] = 'Asia/Shanghai';
+            if ($addr[1] && $addr[2]) {
+                $info['region'] = $addr[1];
+                $info['city'] = $addr[2];
+            }
+        }
     }
     $info['scope'] = tryCIDR($detail['beginIP'], $detail['endIP']);
     $info['detail'] = $detail['dataA'] . $detail['dataB'];