diff --git a/codes/data/util.py b/codes/data/util.py
index 181896b1..719c65f3 100644
--- a/codes/data/util.py
+++ b/codes/data/util.py
@@ -50,7 +50,13 @@ def get_image_paths(data_type, dataroot):
         if data_type == 'lmdb':
             paths, sizes = _get_paths_from_lmdb(dataroot)
         elif data_type == 'img':
-            paths = sorted(_get_paths_from_images(dataroot))
+            if isinstance(dataroot, list):
+                paths = []
+                for r in dataroot:
+                    paths.extend(_get_paths_from_images(r))
+                paths = sorted(paths)
+            else:
+                paths = sorted(_get_paths_from_images(dataroot))
         else:
             raise NotImplementedError('data_type [{:s}] is not recognized.'.format(data_type))
     return paths, sizes