diff --git a/proto/ModelConfig.proto.m4 b/proto/ModelConfig.proto.m4
index aea77248cbac0f3ee044b05894d37718e692a0fc..c835cfd5221c8579b383c0a6f0b2f0f554eac6d2 100644
--- a/proto/ModelConfig.proto.m4
+++ b/proto/ModelConfig.proto.m4
@@ -92,7 +92,7 @@ message PoolConfig {
   optional uint32 start = 4;
 
   // Defines the stride size between successive pooling squares.
-  required uint32 stride = 5;
+  required uint32 stride = 5 [default = 1];
 
   // The size of output feature map.
   required uint32 output_x = 6;
@@ -105,19 +105,19 @@ message PoolConfig {
   optional uint32 padding = 8 [default = 0];
 
   // if not set, use size_x
-  optional uint32 size_y = 9 [default = 0];
+  optional uint32 size_y = 9;
 
   // if not set, use stride
-  optional uint32 stride_y = 10 [default = 0];
+  optional uint32 stride_y = 10;
 
   // if not set, use output_x
-  optional uint32 output_y = 11 [default = 0];
+  optional uint32 output_y = 11;
 
   // if not set, use img_size
-  optional uint32 img_size_y = 12 [default = 0];
+  optional uint32 img_size_y = 12;
 
   // if not set, use padding
-  optional uint32 padding_y = 13 [default = 0];
+  optional uint32 padding_y = 13;
 }
 
 message SppConfig {
diff --git a/python/paddle/trainer/config_parser.py b/python/paddle/trainer/config_parser.py
index dbe2f3b29278c259945564959690a3aa6c0cfbe0..9db42bf172a77ff0972107dd26eed3882bf5906e 100644
--- a/python/paddle/trainer/config_parser.py
+++ b/python/paddle/trainer/config_parser.py
@@ -592,6 +592,7 @@ class DotMulProjection(Projection):
     def calc_parameter_dims(self, input_size, output_size):
         return [1, output_size]
 
+
 # ScalingProjection
 @config_class
 class ScalingProjection(Projection):
@@ -808,17 +809,18 @@ class BilinearInterp(Cfg):
 # please refer to the comments in proto/ModelConfig.proto
 @config_class
 class Pool(Cfg):
-    def __init__(self,
-                 pool_type,
-                 channels,
-                 size_x,
-                 size_y=None,
-                 img_width=None,
-                 start=None,
-                 stride=None,
-                 stride_y=None,
-                 padding=None,
-                 padding_y=None):
+    def __init__(
+            self,
+            pool_type,
+            channels,
+            size_x,
+            size_y=None,
+            img_width=None,
+            start=None,
+            stride=None,  # 1 by defalut in protobuf
+            stride_y=None,
+            padding=None,  # 0 by defalut in protobuf
+            padding_y=None):
         self.add_keys(locals())
 
 
@@ -1113,13 +1115,13 @@ def parse_pool(pool, input_layer_name, pool_conf):
 
     if pool.padding is not None:
         pool_conf.padding = pool.padding
-        pool_conf.padding_y = default(pool.padding_y, pool_conf.padding)
-        pool_conf.output_x = cnn_output_size(
-            pool_conf.img_size, pool_conf.size_x, pool_conf.padding,
-            pool_conf.stride, False)
-        pool_conf.output_y = cnn_output_size(
-            pool_conf.img_size_y, pool_conf.size_y, pool_conf.padding_y,
-            pool_conf.stride_y, False)
+    pool_conf.padding_y = default(pool.padding_y, pool_conf.padding)
+    pool_conf.output_x = cnn_output_size(pool_conf.img_size, pool_conf.size_x,
+                                         pool_conf.padding, pool_conf.stride,
+                                         False)
+    pool_conf.output_y = cnn_output_size(pool_conf.img_size_y, pool_conf.size_y,
+                                         pool_conf.padding_y,
+                                         pool_conf.stride_y, False)
 
 
 def parse_spp(spp, input_layer_name, spp_conf):