diff --git a/pdseg/models/modeling/deeplab.py b/pdseg/models/modeling/deeplab.py
index 454a5c4700e6b68a1be177b735c1711dc69564cc..d05a0d049fdf548b0ed6cfb0f96c48b61e29de27 100644
--- a/pdseg/models/modeling/deeplab.py
+++ b/pdseg/models/modeling/deeplab.py
@@ -249,6 +249,8 @@ def resnet_vd(input):
     else:
         raise Exception("deeplab only support stride 8 or 16")
     lr_mult_list = cfg.MODEL.DEEPLAB.BACKBONE_LR_MULT_LIST
+    if lr_mult_list is None:
+        lr_mult_list = [1.0, 1.0, 1.0, 1.0, 1.0]
     model = resnet_vd_backbone(
         layers, stem='deeplab', lr_mult_list=lr_mult_list)
     data, decode_shortcuts = model.net(