diff --git a/webapp/controller/BaseController.class.php b/webapp/controller/BaseController.class.php
index 316feccf..7376f0fa 100644
--- a/webapp/controller/BaseController.class.php
+++ b/webapp/controller/BaseController.class.php
@@ -53,8 +53,9 @@ class BaseController {
     public function _getZid()
     {
         $net = getReqVal('_net', '');
-        $zid = $net && strlen($net) > 3 ? $net[2] : 3;
-        return ($zid >= 1 && $zid <= 8) ? $zid : 3;
+        $values = explode('-', $net);
+        $zid = $values[1];
+        return substr($zid, 1);
     }
 
     public function _rspErr($errcode, $errmsg)