diff --git a/libvirt/libvirt.php b/libvirt/libvirt.php
index 97eb30e..fa3f165 100644
--- a/libvirt/libvirt.php
+++ b/libvirt/libvirt.php
@@ -419,6 +419,22 @@ class Libvirt {
 		@unlink(__DIR__ . "/{$server}.xml");
 	}
 	
+	/**
+	 *
+	 *	changeMac 修改指定虚拟机的网卡 MAC
+	 *
+	 *	@param $server	虚拟机名称
+	 *	@param $newMac	新的网卡 MAC
+	 *
+	 */
+	public function changeMac($server, $newMac) {
+		$data = $this->dumpxml($server);
+		$data = preg_replace("/address='([A-Za-z0-9\:]+)'/", "address='" . $Libvirt->randomMac() . "'", $data);
+		@file_put_contents(__DIR__ . "/{$server}.xml", $data);
+		$this->uploadFile(__DIR__ . "/{$server}.xml", $this->libpath . "/{$server}.xml");
+		@unlink(__DIR__ . "/{$server}.xml");
+	}
+	
 	/**
 	 *
 	 *	createDisk 创建新的虚拟磁盘