diff --git a/dygraph/paddleseg/utils/config.py b/dygraph/paddleseg/utils/config.py
index 4823aac135936e072b33a7463da26f37e8a247b4..49ac23b493a7f6d3f81d3d3dbb730e83211e0d8c 100644
--- a/dygraph/paddleseg/utils/config.py
+++ b/dygraph/paddleseg/utils/config.py
@@ -130,6 +130,7 @@ class Config(object):
             lr = self._learning_rate
             args = self.decay_args
             args.setdefault('decay_steps', self.iters)
+            args.setdefault('end_lr', 0)
             return paddle.optimizer.PolynomialLR(lr, **args)
         else:
             raise RuntimeError('Only poly decay support.')