diff --git a/go/.gitignore b/go/.gitignore
index 000e1fd55b63b8e532308b787c2708a6c3e5ac87..398d70ca375ffceccdbfc82a4851a6830ca31264 100644
--- a/go/.gitignore
+++ b/go/.gitignore
@@ -1,2 +1,3 @@
 vendor/
 .glide/
+proto/*.go
diff --git a/go/glide.lock b/go/glide.lock
index ce654d36364f8078a493651d8d8b141532eea26d..d15fc934dbe511389cc92ce95cededa41ba32b4d 100644
--- a/go/glide.lock
+++ b/go/glide.lock
@@ -1,5 +1,5 @@
-hash: 51d9e2e46d7fd9173ff11ecada40f7b7728756be18d5e2f032535f66465e6e15
-updated: 2017-10-24T15:04:09.987751592-07:00
+hash: 107c058cf5c9163a75d40eef2273a793c36112683c25d72aa8288827fdde3a19
+updated: 2017-10-30T03:46:19.137696069Z
 imports:
 - name: github.com/alecthomas/gometalinter
   version: bae2f1293d092fd8167939d5108d1b025eaef9de
diff --git a/go/glide.yaml b/go/glide.yaml
index ba253f8bebef0ddab810a8303ab1fbe541defbdf..c5d66694acd0f45de5002391a7953b7491eaf2bc 100644
--- a/go/glide.yaml
+++ b/go/glide.yaml
@@ -30,3 +30,4 @@ import:
   version: v2.13
 - package: github.com/go-stack/stack
   version: v1.6.0
+- package: github.com/golang/protobuf
diff --git a/go/proto/.gitignore b/go/proto/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..5e7d2734cfc60289debf74293817c0a8f572ff32
--- /dev/null
+++ b/go/proto/.gitignore
@@ -0,0 +1,4 @@
+# Ignore everything in this directory
+*
+# Except this file
+!.gitignore
diff --git a/go/pserver/CMakeLists.txt b/go/pserver/CMakeLists.txt
index 4fe0a8cb021e8dbf443c8f33bfb046e228a2fd8d..9ac05199e7ab76c21275838092c0afbdf2612b77 100644
--- a/go/pserver/CMakeLists.txt
+++ b/go/pserver/CMakeLists.txt
@@ -13,5 +13,5 @@
 # limitations under the License.
 #
 if(WITH_TESTING)
-  go_test(pserver_test DEPS paddle_go_optimizer)
+  go_test(pserver_test DEPS paddle_go_optimizer gen_proto_go)
 endif()
diff --git a/go/pserver/service.go b/go/pserver/service.go
index f703d99a29ae9f5310ef36a7492b729c4c892937..7484ec90b1a3a9e67fa798741a9dfeb580c51f1a 100644
--- a/go/pserver/service.go
+++ b/go/pserver/service.go
@@ -17,6 +17,7 @@ package pserver
 import (
 	"bufio"
 	"bytes"
+	"encoding/binary"
 	"encoding/gob"
 	"encoding/json"
 	"errors"
@@ -26,11 +27,15 @@ import (
 	"os"
 	"path"
 	"strconv"
+	"strings"
 	"sync"
 	"time"
 
+	"github.com/golang/protobuf/proto"
 	uuid "github.com/satori/go.uuid"
 
+	pb "github.com/PaddlePaddle/Paddle/go/proto"
+
 	log "github.com/inconshreveable/log15"
 )
 
@@ -65,6 +70,46 @@ type Parameter struct {
 	Content     []byte
 }
 
+func float32ToString(b []byte) string {
+	f := make([]float32, len(b)/4)
+	buf := bytes.NewReader(b)
+	err := binary.Read(buf, binary.LittleEndian, &f)
+	if err != nil {
+		return ""
+	}
+	return fmt.Sprintf("%v", f)
+}
+
+func float32ByteToString(c []byte) string {
+	var a []byte
+	var b []byte
+	if len(c) <= 80 {
+		a = c
+	} else {
+		a = c[0:40]
+		b = c[len(c)-40:]
+	}
+
+	var s string
+	s = float32ToString(a)
+
+	if b == nil {
+		return s
+	}
+
+	s = strings.Replace(s, "]", "", -1) + "..." + strings.Replace(float32ToString(b), "[", "", -1)
+	return s
+}
+
+func (p Parameter) String() string {
+	if p.ElementType != Float32 {
+		return fmt.Sprintf("name:%v ElementType:%v",
+			p.Name, p.ElementType)
+	}
+
+	return float32ByteToString(p.Content)
+}
+
 // ParameterWithConfig contains the parameter and the configuration.
 type ParameterWithConfig struct {
 	Param  Parameter
@@ -189,7 +234,9 @@ func (s *Service) InitParam(paramWithConfigs ParameterWithConfig, _ *int) error
 	default:
 	}
 
-	// TODO(helin): parse parameter config
+	c := &pb.OptimizerConfig{}
+	proto.Unmarshal(paramWithConfigs.Config, c)
+	log.Debug(fmt.Sprintf("OptimizerConfig:%v", c))
 
 	s.mu.Lock()
 	defer s.mu.Unlock()
@@ -239,7 +286,8 @@ func (s *Service) SendGrad(g Gradient, _ *int) error {
 	select {
 	case <-s.initialized:
 	default:
-		log.Warn("received gradient before initialization.", "name", g.Name, "size", len(g.Content), "type", g.ElementType)
+		log.Warn("received gradient before initialization.",
+			"name", g.Name, "size", len(g.Content), "type", g.ElementType)
 		return errors.New(Uninitialized)
 	}
 
@@ -248,10 +296,14 @@ func (s *Service) SendGrad(g Gradient, _ *int) error {
 
 	o, ok := s.optMap[g.Name]
 	if !ok {
+		log.Warn("received gradient but can't find name.",
+			"name", g.Name, "size", len(g.Content), "type", g.ElementType)
 		return fmt.Errorf("parameter: %s does not exist", g.Name)
 	}
 
-	log.Info("received gradient from trainer, updating gradient.", "name", g.Name, "size", len(g.Content), "type", g.ElementType)
+	log.Debug(Parameter(g).String())
+	log.Info("received gradient from trainer, updating gradient.",
+		"name", g.Name, "size", len(g.Content), "type", g.ElementType)
 	return o.UpdateParameter(g)
 }
 
@@ -277,7 +329,7 @@ func (s *Service) GetParam(name string, parameter *Parameter) error {
 	parameter.Name = name
 	parameter.ElementType = opt.elementType
 	parameter.Content = opt.GetWeights()
-
+	log.Debug(parameter.String())
 	log.Info("sending parameter to the trainer", "name", parameter.Name, "size", len(parameter.Content), "type", parameter.ElementType)
 	return nil
 }
diff --git a/go/pserver/service_test.go b/go/pserver/service_test.go
index b6f4566eb78cf797e3738afa5f86f5c4e8090d85..58a743e1fadff9d629f682d660e661013c33ac8a 100644
--- a/go/pserver/service_test.go
+++ b/go/pserver/service_test.go
@@ -15,6 +15,7 @@
 package pserver_test
 
 import (
+	"fmt"
 	"io/ioutil"
 	"reflect"
 	"sync"
@@ -178,3 +179,33 @@ func TestBlockUntilInitialized(t *testing.T) {
 
 	wg.Wait()
 }
+
+func TestGradientString(t *testing.T) {
+	g := pserver.Parameter{}
+	g.ElementType = pserver.Float32
+	g.Content = []byte{0x18, 0x2d, 0x44, 0x54, 0xfb, 0x21, 0x09, 0x40, 0x18, 0x2d, 0x44, 0x54, 0xfb, 0x21, 0x09, 0x40}
+	if g.String() != "[3.3702806e+12 2.142699 3.3702806e+12 2.142699]" {
+		t.Fatal("get float data error!")
+	}
+
+	g.Content = []byte{0x18, 0x2d, 0x44, 0x54, 0xfb, 0x21, 0x09, 0x40,
+		0x18, 0x2d, 0x44, 0x54, 0xfb, 0x21, 0x09, 0x40,
+		0x18, 0x2d, 0x44, 0x54, 0xfb, 0x21, 0x09, 0x40,
+		0x18, 0x2d, 0x44, 0x54, 0xfb, 0x21, 0x09, 0x40,
+		0x18, 0x2d, 0x44, 0x54, 0xfb, 0x21, 0x09, 0x40,
+		0x18, 0x2d, 0x44, 0x54, 0xfb, 0x21, 0x09, 0x40,
+		0x18, 0x2d, 0x44, 0x54, 0xfb, 0x21, 0x09, 0x40,
+		0x18, 0x2d, 0x44, 0x54, 0xfb, 0x21, 0x09, 0x40,
+		0x18, 0x2d, 0x44, 0x54, 0xfb, 0x21, 0x09, 0x40,
+		0x18, 0x2d, 0x44, 0x54, 0xfb, 0x21, 0x09, 0x40,
+		0x18, 0x2d, 0x44, 0x54, 0xfb, 0x21, 0x09, 0x40,
+		0x18, 0x2d, 0x44, 0x54, 0xfb, 0x21, 0x09, 0x40,
+		0x18, 0x2d, 0x44, 0x54, 0xfb, 0x21, 0x09, 0x40,
+		0x18, 0x2d, 0x44, 0x54, 0xfb, 0x21, 0x09, 0x40,
+		0x18, 0x2d, 0x44, 0x54, 0xfb, 0x21, 0x09, 0x40,
+		0x18, 0x2d, 0x44, 0x54, 0xfb, 0x21, 0x09, 0x40}
+	if g.String() != "[3.3702806e+12 2.142699 3.3702806e+12 2.142699 3.3702806e+12 2.142699 3.3702806e+12 2.142699 3.3702806e+12 2.142699...3.3702806e+12 2.142699 3.3702806e+12 2.142699 3.3702806e+12 2.142699 3.3702806e+12 2.142699 3.3702806e+12 2.142699]" {
+		t.Fatal("get float data error!", g.String())
+	}
+	fmt.Println(g)
+}
diff --git a/proto/CMakeLists.txt b/proto/CMakeLists.txt
index 5d898d860cfc6dc26eaf5a81d8aed6d757ed5831..556bcd1d7e60c27fece43de666e9531ab4203414 100644
--- a/proto/CMakeLists.txt
+++ b/proto/CMakeLists.txt
@@ -27,3 +27,30 @@ foreach(filename ${proto_filenames})
 endforeach()
 
 add_custom_target(gen_proto_py ALL DEPENDS ${PROTO_GEN_PY})
+
+
+if (WITH_GOLANG)
+    add_custom_target(protoc-gen-go)
+    add_custom_command(TARGET protoc-gen-go
+            COMMAND go 
+            ARGS "get" "-u" "github.com/golang/protobuf/protoc-gen-go")
+
+    set(PROTO_GEN_GO)
+    file(GLOB proto_filenames . OptimizerConfig.proto)
+    foreach(filename ${proto_filenames})
+        message(STATUS ${filename})
+        get_filename_component(ABS_FIL ${filename} ABSOLUTE)
+        get_filename_component(FIL_WE ${filename} NAME_WE)
+        set(CUR_PROTO_GEN_GO
+                ${PADDLE_SOURCE_DIR}/paddle/go/proto/${FIL_WE}.pb.go)
+        set(PROTO_GEN_GO
+                ${CUR_PROTO_GEN_GO}
+                ${PROTO_GEN_GO})
+        add_custom_command(OUTPUT ${CUR_PROTO_GEN_GO}
+                COMMAND ${PROTOBUF_PROTOC_EXECUTABLE}
+                ARGS "--go_out=${PADDLE_SOURCE_DIR}/go/proto"
+                "-I" ${CMAKE_CURRENT_SOURCE_DIR} ${ABS_FIL}
+                DEPENDS ${ABS_FIL} protoc protoc-gen-go)
+    endforeach()
+    add_custom_target(gen_proto_go ALL DEPENDS ${PROTO_GEN_GO})
+endif()
diff --git a/python/paddle/v2/trainer.py b/python/paddle/v2/trainer.py
index b68fd0d5a97a7993ddd0a1d947304fa5428c01b8..db01ab7374eca18b6063dc634da5ef83c4bc9adc 100644
--- a/python/paddle/v2/trainer.py
+++ b/python/paddle/v2/trainer.py
@@ -205,7 +205,8 @@ class SGD(object):
         """
         Testing method. Will test input data.
 
-        :param reader: A reader that reads and yeilds data items.
+        :param reader: A batch reader that reads and yeilds data items,
+                       it should be a paddle.v2.batch.
         :type reader: collections.Iterable
         :param feeding: Feeding is a map of neural network input name and array
                         index that reader returns.