diff --git a/balance/abstract.go b/balance/abstract.go
new file mode 100644
index 0000000..1275f69
--- /dev/null
+++ b/balance/abstract.go
@@ -0,0 +1,30 @@
+// Package balance...
+//
+// Description : balance...
+//
+// Author : go_developer@163.com<白茶清欢>
+//
+// Date : 2021-11-22 4:45 下午
+package balance
+
+import (
+	"net/http"
+
+	"git.zhangdeman.cn/zhangdeman/gopkg/balance/define"
+)
+
+// IBalance 负载算法接口约束
+//
+// Author : go_developer@163.com<白茶清欢>
+//
+// Date : 4:45 下午 2021/11/22
+type IBalance interface {
+	// GetServerNode 获取一个服务器节点
+	GetServerNode(req *http.Request) (*define.ServerNode, error)
+	// AddServerNode 新增一个服务器节点
+	AddServerNode(hostIP string, port int) error
+	// Remove 移除一个节点
+	Remove(hostIP string, port int, force bool)
+	// GetServerNodeList 获取服务节点列表
+	GetServerNodeList() []*define.ServerNode
+}
diff --git a/balance/poll.go b/balance/poll.go
index c89eac8..62337d7 100644
--- a/balance/poll.go
+++ b/balance/poll.go
@@ -8,6 +8,7 @@
 package balance
 
 import (
+	"net/http"
 	"sync"
 
 	"git.zhangdeman.cn/zhangdeman/gopkg/balance/define"
@@ -48,7 +49,7 @@ type Poll struct {
 // Author : go_developer@163.com<白茶清欢>
 //
 // Date : 12:43 下午 2021/10/19
-func (p *Poll) GetServerNode() (*define.ServerNode, error) {
+func (p *Poll) GetServerNode(req *http.Request) (*define.ServerNode, error) {
 	if len(p.serverList) == 0 {
 		return nil, errors.New("server list is empty")
 	}