diff --git a/middleware/etcd/define.go b/middleware/etcd/define.go
index f2f73fa..b2f3d00 100644
--- a/middleware/etcd/define.go
+++ b/middleware/etcd/define.go
@@ -10,6 +10,8 @@ package etcd
 import (
 	"math"
 	"time"
+
+	"go.etcd.io/etcd/clientv3"
 )
 
 // 初始化client各种默认配置
@@ -33,3 +35,6 @@ const (
 	// DefaultGetTimeout get 默认超时时间
 	DefaultGetTimeout = time.Second
 )
+
+// WatcherHandler 监听key变化的处理函数
+type WatcherHandler func(event *clientv3.Event)
diff --git a/middleware/etcd/watch.go b/middleware/etcd/watch.go
new file mode 100644
index 0000000..c48605a
--- /dev/null
+++ b/middleware/etcd/watch.go
@@ -0,0 +1,30 @@
+// Package etcd...
+//
+// Description : 监听key的变化
+//
+// Author : go_developer@163.com<白茶清欢>
+//
+// Date : 2021-11-23 2:58 下午
+package etcd
+
+import (
+	"context"
+)
+
+// WatchKey 监听key的变化
+//
+// Author : go_developer@163.com<白茶清欢>
+//
+// Date : 2:58 下午 2021/11/23
+func WatchKey(ctx context.Context, watchKey string, callbackFunc WatcherHandler) {
+	if nil == callbackFunc {
+		// 变化之后,没有任何逻辑处理,视为不需要监听变化
+		return
+	}
+	rch := Client.Watch(context.Background(), watchKey) // <-chan WatchResponse
+	for watchResp := range rch {
+		for _, ev := range watchResp.Events {
+			callbackFunc(ev)
+		}
+	}
+}