diff --git a/app/common/utils/pdf/service/MpdfDriver.php b/app/common/utils/pdf/service/MpdfDriver.php
index a17d17a..a0c3c6c 100644
--- a/app/common/utils/pdf/service/MpdfDriver.php
+++ b/app/common/utils/pdf/service/MpdfDriver.php
@@ -186,7 +186,7 @@ class MpdfDriver
         $pdf = $mpdf->Output('车辆详情.pdf', 'S');
         $dir = runtime_path('pdf');
         if (!is_dir($dir)) mkdir($dir, 0777, true);
-        $pdfName = 'invoice-' . $car['code'].'-'.$car['id'] . '-' . $lang . '.pdf';
+        $pdfName = 'invoice-' . $car['code'].'-'.$car['id'] . '-' . $lang . '-' .substr(time(),4,6). '.pdf';
         $path = $dir . '/' . $pdfName;
         file_put_contents($path, $pdf);