diff --git a/python/paddle/trainer_config_helpers/layers.py b/python/paddle/trainer_config_helpers/layers.py
index dabf8e2953054356278a81e54ae7a7d15e358af9..dc5acb19b35e9eefd063e76618618a3b6b844ca4 100644
--- a/python/paddle/trainer_config_helpers/layers.py
+++ b/python/paddle/trainer_config_helpers/layers.py
@@ -2704,8 +2704,8 @@ def conv_operator(img, filter, filter_size, num_filters,
                         PaddlePaddle now supports rectangular filters,
                         the filter's shape can be (filter_size, filter_size_y).
     :type filter_size_y: int
-    :param num_filter: channel of output data.
-    :type num_filter: int
+    :param num_filters: channel of output data.
+    :type num_filters: int
     :param num_channel: channel of input data.
     :type num_channel: int
     :param stride: The x dimension of the stride.
@@ -2726,7 +2726,7 @@ def conv_operator(img, filter, filter_size, num_filters,
     if padding_y is None:
         padding_y = padding
     op = ConvOperator(input_layer_names=[img.name, filter.name],
-                      num_filters = num_filter,
+                      num_filters = num_filters,
                       conv_conf=Conv(filter_size=filter_size,
                                      padding=padding,
                                      stride=stride,
diff --git a/python/paddle/trainer_config_helpers/tests/layers_test_config.py b/python/paddle/trainer_config_helpers/tests/layers_test_config.py
index b9eaf2fce7572343e1ab65aa7ae8997f9245e044..cd368d6b12cbdd0bb86a79d47034dc9ccfa2e4e2 100644
--- a/python/paddle/trainer_config_helpers/tests/layers_test_config.py
+++ b/python/paddle/trainer_config_helpers/tests/layers_test_config.py
@@ -23,6 +23,15 @@ z = out_prod_layer(input1=x, input2=y)
 
 x1 = fc_layer(input=x, size=5)
 y1 = fc_layer(input=y, size=5)
+
+z1 = mixed_layer(act=LinearActivation(),
+                 input=[conv_operator(img=x1,
+                                      filter=y1,
+                                      filter_size=1,
+                                      num_filters=5,
+                                      num_channel=5,
+                                      stride=1)])
+
 y2 = fc_layer(input=y, size=15)
 
 cos1 = cos_sim(a=x1, b=y1)
@@ -30,7 +39,7 @@ cos3 = cos_sim(a=x1, b=y2, size=3)
 
 linear_comb = linear_comb_layer(weights=x1, vectors=y2, size=3)
 
-out = fc_layer(input=[cos1, cos3, linear_comb, z],
+out = fc_layer(input=[cos1, cos3, linear_comb, z, z1],
                size=num_classes,
                act=SoftmaxActivation())