diff --git a/python/paddle/trainer_config_helpers/networks.py b/python/paddle/trainer_config_helpers/networks.py
index 6e231cc10f5442527da63e8aae43755d03d8d0e1..368fc1e832dc62189d0c5431ecca325a54da8cf8 100644
--- a/python/paddle/trainer_config_helpers/networks.py
+++ b/python/paddle/trainer_config_helpers/networks.py
@@ -447,7 +447,7 @@ def img_separable_conv(input,
                        bias_attr=None,
                        param_attr=None,
                        shared_bias=True,
-                       layer_type=None,
+                       layer_type='exconv',
                        name=None):
     """
     Separable Convolution.
@@ -510,8 +510,7 @@ def img_separable_conv(input,
         act=act,
         bias_attr=bias_attr,
         param_attr=param_attr,
-        shared_biases=shared_bias,
-        layer_type=layer_type)
+        shared_biases=shared_bias)
     return __pointwise_conv__