diff --git a/python/paddle/fluid/imperative/nn.py b/python/paddle/fluid/imperative/nn.py
index 5aff3ea2d1f45a3ad0290a649bea06143bc1f146..bf3f7ce52e8d77fc2920b3bb63ec5b15a98b29b7 100644
--- a/python/paddle/fluid/imperative/nn.py
+++ b/python/paddle/fluid/imperative/nn.py
@@ -112,7 +112,7 @@ class Conv2D(layers.Layer):
                 'strides': self._stride,
                 'paddings': self._padding,
                 'dilations': self._dilation,
-                'groups': self._groups,
+                'groups': self._groups if self._groups else 1,
                 'use_cudnn': self._use_cudnn,
                 'use_mkldnn': False,
             })