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 adcd14569e560c84806b5e051dd4c62ecd3ecd03..427d69078660698d5300334bcaa2655171930d28 100644
--- a/python/paddle/trainer/config_parser.py
+++ b/python/paddle/trainer/config_parser.py
@@ -815,9 +815,9 @@ class Pool(Cfg):
                  size_y=None,
                  img_width=None,
                  start=None,
-                 stride=1,
+                 stride=None, # 1 by defalut in protobuf
                  stride_y=None,
-                 padding=0,
+                 padding=None, # 0 by defalut in protobuf
                  padding_y=None):
         self.add_keys(locals())
 
@@ -1111,9 +1111,9 @@ def parse_pool(pool, input_layer_name, pool_conf):
 
     config_assert(not pool.start, "start is deprecated in pooling.")
 
-    pool_conf.padding = pool.padding
+    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)