diff --git a/ppdet/utils/download.py b/ppdet/utils/download.py
index c915174e354585aac25bdd3e680e426e2d29d89b..daa2793b78be25f19a722f463b2eb7581d75df35 100644
--- a/ppdet/utils/download.py
+++ b/ppdet/utils/download.py
@@ -18,6 +18,7 @@ from __future__ import print_function
 
 import os
 import os.path as osp
+import sys
 import yaml
 import shutil
 import requests
@@ -349,6 +350,11 @@ def _download(url, path, md5sum=None):
 
         logger.info("Downloading {} from {}".format(fname, url))
 
+        
+        # NOTE: windows path join may incur \, which is invalid in url
+        if sys.platform == "win32":
+            url = url.replace('\\', '/')
+
         req = requests.get(url, stream=True)
         if req.status_code != 200:
             raise RuntimeError("Downloading from {} failed with code "