diff --git a/go/pserver/optimizer.go b/go/pserver/optimizer.go
index 070896f7c7611f2429e77df030d1511a34f95b0f..b4a040f46bff5c25b193d41e5d36b59762891574 100644
--- a/go/pserver/optimizer.go
+++ b/go/pserver/optimizer.go
@@ -49,7 +49,7 @@ func newOptimizer(paramWithConfigs ParameterWithConfig) *optimizer {
 	cbuffer = C.malloc(C.size_t(len(p.Content)))
 	C.memcpy(cbuffer, unsafe.Pointer(&p.Content[0]), C.size_t(len(p.Content)))
 	o.opt = C.paddle_create_optimizer((*C.uchar)(&c[0]), C.int(len(c)),
-		C.paddle_element_type(p.ElementType), cbuffer, C.int(len(p.Content)*C.sizeof_float),
+		C.paddle_element_type(p.ElementType), cbuffer, C.int(len(p.Content)/C.sizeof_float),
 		(*C.char)(nullPtr), 0)
 	return o
 }
@@ -57,7 +57,7 @@ func newOptimizer(paramWithConfigs ParameterWithConfig) *optimizer {
 func (o *optimizer) GetWeights() []byte {
 	var buffer unsafe.Pointer
 	buffer_len := C.paddle_optimizer_get_weights(o.opt, &buffer)
-	return cArrayToSlice(buffer, int(buffer_len))
+	return cArrayToSlice(buffer, int(buffer_len)*C.sizeof_float)
 }
 
 func (o *optimizer) UpdateParameter(g Gradient) error {
@@ -65,7 +65,7 @@ func (o *optimizer) UpdateParameter(g Gradient) error {
 		return fmt.Errorf("Name: %s, parameter and gradient element type not match, parameter: %v, gradient: %v", g.Name, o.elementType, g.ElementType)
 	}
 
-	r := C.paddle_update_parameter(o.opt, C.paddle_element_type(g.ElementType), unsafe.Pointer(&g.Content[0]), C.int(len(g.Content)))
+	r := C.paddle_update_parameter(o.opt, C.paddle_element_type(g.ElementType), unsafe.Pointer(&g.Content[0]), C.int(len(g.Content))/C.sizeof_float)
 	if r != 0 {
 		return fmt.Errorf("optimizer update returned error code: %d", r)
 	}
diff --git a/go/pserver/optimizer_test.go b/go/pserver/optimizer_test.go
index 49d9df5898dc69a8e50c4a712e9b04467b45a7b8..368047d6f89e080016909efbc5bd090c42530bfd 100644
--- a/go/pserver/optimizer_test.go
+++ b/go/pserver/optimizer_test.go
@@ -2,7 +2,6 @@ package pserver
 
 import (
 	"io/ioutil"
-	"reflect"
 	"testing"
 )
 
@@ -23,26 +22,3 @@ func TestOptimizerCreateRelease(t *testing.T) {
 	o := newOptimizer(param)
 	o.Cleanup()
 }
-
-func TestOptimizerFull(t *testing.T) {
-	p := Parameter{
-		Name:        "a",
-		ElementType: Float32,
-	}
-	p.Content = []byte{1, 3}
-	config, err := ioutil.ReadFile("./cclient/test/testdata/optimizer.pb.txt")
-	if err != nil {
-		t.Fatalf("read optimizer proto failed")
-	}
-	param := ParameterWithConfig{
-		Param:  p,
-		Config: config,
-	}
-	o := newOptimizer(param)
-	g := Gradient(p)
-	if !reflect.DeepEqual(p.Content, o.GetWeights()) {
-		t.FailNow()
-	}
-	o.UpdateParameter(g)
-	o.Cleanup()
-}
diff --git a/go/pserver/service_test.go b/go/pserver/service_test.go
index c62f92e09bb3d65aa9552e3624e5d8e1a1945e56..f86619447c28b5be8071d28a127b48768939261b 100644
--- a/go/pserver/service_test.go
+++ b/go/pserver/service_test.go
@@ -10,8 +10,7 @@ import (
 	"github.com/PaddlePaddle/Paddle/go/pserver"
 )
 
-
-func TestFull(t *testing.T) {
+func TestServiceFull(t *testing.T) {
 	s, err := pserver.NewService(0)
 	if err != nil {
 		t.Error(err)