diff --git a/config_center/dynamic_configuration.go b/config_center/dynamic_configuration.go
index 436ac50d86ae9900bb84e082c5d3762b57836f59..8115fed8203438c9371a1b7fa20815843a2e81fd 100644
--- a/config_center/dynamic_configuration.go
+++ b/config_center/dynamic_configuration.go
@@ -18,9 +18,11 @@
 package config_center
 
 import (
-	"github.com/apache/dubbo-go/remoting"
 	"time"
 )
+import (
+	"github.com/apache/dubbo-go/remoting"
+)
 
 //////////////////////////////////////////
 // DynamicConfiguration
diff --git a/config_center/zookeeper/dynamic_configuration.go b/config_center/zookeeper/dynamic_configuration.go
index bd9f97785065b2f3acfb5acd484cf5c818dda7cb..c998c586fb0a22223acaee634cb5f187e04223fc 100644
--- a/config_center/zookeeper/dynamic_configuration.go
+++ b/config_center/zookeeper/dynamic_configuration.go
@@ -18,7 +18,6 @@
 package zookeeper
 
 import (
-	"github.com/apache/dubbo-go/remoting"
 	"sync"
 )
 import (
@@ -26,10 +25,11 @@ import (
 	"github.com/apache/dubbo-go/common/constant"
 	"github.com/apache/dubbo-go/common/logger"
 	"github.com/apache/dubbo-go/config_center"
+	"github.com/apache/dubbo-go/remoting"
 	"github.com/apache/dubbo-go/remoting/zookeeper"
 )
 
-const ZkClient = "zk config_center"
+const ZK_CLIENT = "zk config_center"
 
 type ZookeeperDynamicConfiguration struct {
 	url      common.URL
@@ -48,7 +48,7 @@ func NewZookeeperDynamicConfiguration(url common.URL) (config_center.DynamicConf
 		url:      url,
 		rootPath: "/" + url.GetParam(constant.CONFIG_NAMESPACE_KEY, config_center.DEFAULT_GROUP) + "/config",
 	}
-	err := zookeeper.ValidateZookeeperClient(c, zookeeper.WithZkName(ZkClient))
+	err := zookeeper.ValidateZookeeperClient(c, zookeeper.WithZkName(ZK_CLIENT))
 	if err != nil {
 		return nil, err
 	}
diff --git a/registry/event.go b/registry/event.go
index 9d5778d9e35156b0c66910538e376b0cde4f0544..24f5b72e8b27d4dc727e72d641d8bae3e00ff165 100644
--- a/registry/event.go
+++ b/registry/event.go
@@ -19,13 +19,13 @@ package registry
 
 import (
 	"fmt"
-	"github.com/apache/dubbo-go/remoting"
 	"math/rand"
 	"time"
 )
 
 import (
 	"github.com/apache/dubbo-go/common"
+	"github.com/apache/dubbo-go/remoting"
 )
 
 func init() {
diff --git a/registry/zookeeper/listener.go b/registry/zookeeper/listener.go
index 2cd1cfec8a38486bef72d9ac8c6df43fd7099062..4f3cf1e19ad28cb10be8adf85351c1f2eb4d4622 100644
--- a/registry/zookeeper/listener.go
+++ b/registry/zookeeper/listener.go
@@ -19,7 +19,6 @@ package zookeeper
 
 import (
 	"context"
-	"github.com/apache/dubbo-go/remoting"
 )
 import (
 	perrors "github.com/pkg/errors"
@@ -28,6 +27,7 @@ import (
 	"github.com/apache/dubbo-go/common"
 	"github.com/apache/dubbo-go/common/logger"
 	"github.com/apache/dubbo-go/registry"
+	"github.com/apache/dubbo-go/remoting"
 	zk "github.com/apache/dubbo-go/remoting/zookeeper"
 )
 
diff --git a/registry/zookeeper/registry.go b/registry/zookeeper/registry.go
index 8f9e865d5e56905d7a26d3c3ccc645f68650b815..ff6a9939694acf89f9a4e73e9566d20d55bf9c0e 100644
--- a/registry/zookeeper/registry.go
+++ b/registry/zookeeper/registry.go
@@ -45,7 +45,6 @@ import (
 )
 
 const (
-	defaultTimeout   = int64(10e9)
 	RegistryZkClient = "zk registry"
 )
 
diff --git a/remoting/zookeeper/listener.go b/remoting/zookeeper/listener.go
index 2a698884277be5cc5c80bf84516da08696d30d56..703d06f84eacef8f830a75846c6130bb36239a1e 100644
--- a/remoting/zookeeper/listener.go
+++ b/remoting/zookeeper/listener.go
@@ -18,7 +18,6 @@
 package zookeeper
 
 import (
-	"github.com/apache/dubbo-go/remoting"
 	"path"
 	"sync"
 	"time"
@@ -32,6 +31,7 @@ import (
 import (
 	"github.com/apache/dubbo-go/common"
 	"github.com/apache/dubbo-go/common/logger"
+	"github.com/apache/dubbo-go/remoting"
 )
 
 type ZkEventListener struct {