diff --git a/api/iprecoder/redis.go b/api/iprecoder/redis.go
index ded63c6..490d425 100644
--- a/api/iprecoder/redis.go
+++ b/api/iprecoder/redis.go
@@ -33,13 +33,13 @@ func (r *Redis) SyncOnlineIp(Ips []dispatcher.UserIpList) ([]dispatcher.UserIpLi
 		if err != nil {
 			return nil, fmt.Errorf("add user failed: %s", err)
 		}
-		r.client.Expire(ctx, "UserList", 2*time.Minute)
+		r.client.Expire(ctx, "UserList", time.Second*time.Duration(r.Expiry))
 		for _, ip := range Ips[i].IpList {
 			err := r.client.SAdd(ctx, strconv.Itoa(Ips[i].Uid), ip).Err()
 			if err != nil {
 				return nil, fmt.Errorf("add ip failed: %s", err)
 			}
-			r.client.Expire(ctx, strconv.Itoa(Ips[i].Uid), 2*time.Minute)
+			r.client.Expire(ctx, strconv.Itoa(Ips[i].Uid), time.Second*time.Duration(r.Expiry))
 		}
 	}
 	c := r.client.SMembers(ctx, "UserList")
diff --git a/conf/node.go b/conf/node.go
index ce5cf15..ce95f93 100644
--- a/conf/node.go
+++ b/conf/node.go
@@ -29,6 +29,7 @@ type RedisConfig struct {
 	Address  string `yaml:"Address"`
 	Password string `yaml:"Password"`
 	Db       int    `yaml:"Db"`
+	Expiry   int    `json:"Expiry"`
 }
 
 type IpReportConfig struct {
diff --git a/example/config.yml.example b/example/config.yml.example
index f64d8db..8358d95 100644
--- a/example/config.yml.example
+++ b/example/config.yml.example
@@ -51,6 +51,7 @@ Nodes:
             Address: "127.0.0.1:6379" # Redis address
             Password: "" # Redis password
             DB: 0 # Redis DB
+            Expiry: 60 # redis expiry time, sec.
           Periodic: 60 # Report interval, sec.
           EnableIpSync: false # Enable online ip sync
       EnableDynamicSpeedLimit: false # Enable dynamic speed limit