diff --git a/internal/balancer/balancer.go b/transport/http/balancer/balancer.go
similarity index 76%
rename from internal/balancer/balancer.go
rename to transport/http/balancer/balancer.go
index 3c79632a1..db2529549 100644
--- a/internal/balancer/balancer.go
+++ b/transport/http/balancer/balancer.go
@@ -14,5 +14,5 @@ type DoneInfo struct {
 
 // Balancer is node pick balancer
 type Balancer interface {
-	Pick(ctx context.Context, pathPattern string, nodes []*registry.ServiceInstance) (node *registry.ServiceInstance, done func(DoneInfo), err error)
+	Pick(ctx context.Context, pathPattern string, nodes []*registry.ServiceInstance) (node *registry.ServiceInstance, done func(context.Context, DoneInfo), err error)
 }
diff --git a/internal/balancer/random/random.go b/transport/http/balancer/random/random.go
similarity index 65%
rename from internal/balancer/random/random.go
rename to transport/http/balancer/random/random.go
index 293dbd66a..f56e66dfd 100644
--- a/internal/balancer/random/random.go
+++ b/transport/http/balancer/random/random.go
@@ -5,8 +5,8 @@ import (
 	"fmt"
 	"math/rand"
 
-	"github.com/go-kratos/kratos/v2/internal/balancer"
 	"github.com/go-kratos/kratos/v2/registry"
+	"github.com/go-kratos/kratos/v2/transport/http/balancer"
 )
 
 var _ balancer.Balancer = &Balancer{}
@@ -18,12 +18,12 @@ func New() *Balancer {
 	return &Balancer{}
 }
 
-func (b *Balancer) Pick(ctx context.Context, pathPattern string, nodes []*registry.ServiceInstance) (node *registry.ServiceInstance, done func(balancer.DoneInfo), err error) {
+func (b *Balancer) Pick(ctx context.Context, pathPattern string, nodes []*registry.ServiceInstance) (node *registry.ServiceInstance, done func(context.Context, balancer.DoneInfo), err error) {
 	if len(nodes) == 0 {
 		return nil, nil, fmt.Errorf("no instances avaiable")
 	} else if len(nodes) == 1 {
-		return nodes[0], func(di balancer.DoneInfo) {}, nil
+		return nodes[0], func(context.Context, balancer.DoneInfo) {}, nil
 	}
 	idx := rand.Intn(len(nodes))
-	return nodes[idx], func(di balancer.DoneInfo) {}, nil
+	return nodes[idx], func(context.Context, balancer.DoneInfo) {}, nil
 }
diff --git a/transport/http/client.go b/transport/http/client.go
index 7cce5eab0..21bf5c852 100644
--- a/transport/http/client.go
+++ b/transport/http/client.go
@@ -12,12 +12,12 @@ import (
 
 	"github.com/go-kratos/kratos/v2/encoding"
 	"github.com/go-kratos/kratos/v2/errors"
-	"github.com/go-kratos/kratos/v2/internal/balancer"
-	"github.com/go-kratos/kratos/v2/internal/balancer/random"
 	"github.com/go-kratos/kratos/v2/internal/httputil"
 	"github.com/go-kratos/kratos/v2/middleware"
 	"github.com/go-kratos/kratos/v2/registry"
 	"github.com/go-kratos/kratos/v2/transport"
+	"github.com/go-kratos/kratos/v2/transport/http/balancer"
+	"github.com/go-kratos/kratos/v2/transport/http/balancer/random"
 )
 
 // Client is http client
@@ -255,7 +255,7 @@ func (client *Client) Invoke(ctx context.Context, path string, args interface{},
 
 func (client *Client) invoke(ctx context.Context, req *http.Request, args interface{}, reply interface{}, c callInfo) error {
 	h := func(ctx context.Context, in interface{}) (interface{}, error) {
-		var done func(balancer.DoneInfo)
+		var done func(context.Context, balancer.DoneInfo)
 		if client.r != nil {
 			nodes := client.r.fetch(ctx)
 			if len(nodes) == 0 {
@@ -276,7 +276,7 @@ func (client *Client) invoke(ctx context.Context, req *http.Request, args interf
 		}
 		res, err := client.do(ctx, req, c)
 		if done != nil {
-			done(balancer.DoneInfo{Err: err})
+			done(ctx, balancer.DoneInfo{Err: err})
 		}
 		if err != nil {
 			return nil, err