diff --git a/api/panel/panel.go b/api/panel/panel.go
index c298d05..9a4a0e9 100644
--- a/api/panel/panel.go
+++ b/api/panel/panel.go
@@ -25,6 +25,8 @@ type Client struct {
 	userEtag         string
 	responseBodyHash string
 	LastReportOnline map[int]int
+	UserList         *UserListBody
+	AliveMap         *AliveMap
 }
 
 func New(c *conf.ApiConfig) (*Client, error) {
@@ -71,5 +73,7 @@ func New(c *conf.ApiConfig) (*Client, error) {
 		APIHost:  c.APIHost,
 		NodeType: c.NodeType,
 		NodeId:   c.NodeID,
+		UserList: &UserListBody{},
+		AliveMap: &AliveMap{},
 	}, nil
 }
diff --git a/api/panel/user.go b/api/panel/user.go
index 88286ab..8bbf9e7 100644
--- a/api/panel/user.go
+++ b/api/panel/user.go
@@ -16,7 +16,6 @@ type UserInfo struct {
 	Uuid        string `json:"uuid"`
 	SpeedLimit  int    `json:"speed_limit"`
 	DeviceLimit int    `json:"device_limit"`
-	AliveIp     int    `json:"alive_ip"`
 }
 
 type UserListBody struct {
@@ -24,8 +23,12 @@ type UserListBody struct {
 	Users []UserInfo `json:"users"`
 }
 
-// GetUserList will pull user form sspanel
-func (c *Client) GetUserList() (UserList []UserInfo, err error) {
+type AliveMap struct {
+	Alive map[int]int `json:"alive"`
+}
+
+// GetUserList will pull user from v2board
+func (c *Client) GetUserList() ([]UserInfo, error) {
 	const path = "/api/v1/server/UniProxy/user"
 	r, err := c.client.R().
 		SetHeader("If-None-Match", c.userEtag).
@@ -34,52 +37,44 @@ func (c *Client) GetUserList() (UserList []UserInfo, err error) {
 	if err = c.checkResponse(r, path, err); err != nil {
 		return nil, err
 	}
-
 	if r != nil {
-		defer func() {
-			if r.RawBody() != nil {
-				r.RawBody().Close()
-			}
-		}()
-		if r.StatusCode() == 304 {
-			return nil, nil
-		}
+		defer r.RawResponse.Body.Close()
 	} else {
 		return nil, fmt.Errorf("received nil response")
 	}
-	var userList *UserListBody
-	if err != nil {
-		return nil, fmt.Errorf("read body error: %s", err)
-	}
-	if err := json.Unmarshal(r.Body(), &userList); err != nil {
-		return nil, fmt.Errorf("unmarshal userlist error: %s", err)
-	}
-	c.userEtag = r.Header().Get("ETag")
 
-	var userinfos []UserInfo
-	var deviceLimit, localDeviceLimit int = 0, 0
-	for _, user := range userList.Users {
-		// If there is still device available, add the user
-		if user.DeviceLimit > 0 && user.AliveIp > 0 {
-			lastOnline := 0
-			if v, ok := c.LastReportOnline[user.Id]; ok {
-				lastOnline = v
-			}
-			// If there are any available device.
-			localDeviceLimit = user.DeviceLimit - user.AliveIp + lastOnline
-			if localDeviceLimit > 0 {
-				deviceLimit = localDeviceLimit
-			} else if lastOnline > 0 {
-				deviceLimit = lastOnline
-			} else {
-				continue
-			}
+	if r.StatusCode() == 304 {
+		return nil, nil
+	} else {
+		if err := json.Unmarshal(r.Body(), c.UserList); err != nil {
+			return nil, fmt.Errorf("unmarshal user list error: %w", err)
 		}
-		user.DeviceLimit = deviceLimit
-		userinfos = append(userinfos, user)
+		c.userEtag = r.Header().Get("ETag")
+	}
+	return c.UserList.Users, nil
+}
+
+// GetUserAlive will fetch the alive IPs for users
+func (c *Client) GetUserAlive() (map[int]int, error) {
+	const path = "/api/v1/server/UniProxy/alivelist"
+	r, err := c.client.R().
+		ForceContentType("application/json").
+		Get(path)
+	if err = c.checkResponse(r, path, err); err != nil {
+		return nil, err
 	}
 
-	return userinfos, nil
+	if r != nil {
+		defer r.RawResponse.Body.Close()
+	} else {
+		return nil, fmt.Errorf("received nil response")
+	}
+
+	if err := json.Unmarshal(r.Body(), c.AliveMap); err != nil {
+		return nil, fmt.Errorf("unmarshal user alive list error: %s", err)
+	}
+
+	return c.AliveMap.Alive, nil
 }
 
 type UserTraffic struct {
diff --git a/core/xray/ss.go b/core/xray/ss.go
index d6efdee..42e265a 100644
--- a/core/xray/ss.go
+++ b/core/xray/ss.go
@@ -38,6 +38,8 @@ func buildSSUser(tag string, userInfo *panel.UserInfo, cypher string, serverKey
 			keyLength = 16
 		case "2022-blake3-aes-256-gcm":
 			keyLength = 32
+		case "2022-blake3-chacha20-poly1305":
+			keyLength = 32
 		}
 		ssAccount := &shadowsocks_2022.User{
 			Level: 0,
diff --git a/limiter/limiter.go b/limiter/limiter.go
index d421500..47479af 100644
--- a/limiter/limiter.go
+++ b/limiter/limiter.go
@@ -21,13 +21,13 @@ var limiter map[string]*Limiter
 func Init() {
 	limiter = map[string]*Limiter{}
 	c := task.Periodic{
-		Interval: time.Minute * 2,
+		Interval: time.Minute * 3,
 		Execute:  ClearOnlineIP,
 	}
 	go func() {
 		log.WithField("Type", "Limiter").
 			Debug("ClearOnlineIP started")
-		time.Sleep(time.Minute * 2)
+		time.Sleep(time.Minute * 3)
 		_ = c.Start()
 	}()
 }
@@ -41,6 +41,7 @@ type Limiter struct {
 	UserLimitInfo *sync.Map      // Key: Uid value: UserLimitInfo
 	ConnLimiter   *ConnLimiter   // Key: Uid value: ConnLimiter
 	SpeedLimiter  *sync.Map      // key: Uid, value: *ratelimit.Bucket
+	AliveList     map[int]int    // Key:Id, value:alive_ip
 }
 
 type UserLimitInfo struct {
@@ -52,13 +53,14 @@ type UserLimitInfo struct {
 	OverLimit         bool
 }
 
-func AddLimiter(tag string, l *conf.LimitConfig, users []panel.UserInfo) *Limiter {
+func AddLimiter(tag string, l *conf.LimitConfig, users []panel.UserInfo, aliveList map[int]int) *Limiter {
 	info := &Limiter{
 		SpeedLimit:    l.SpeedLimit,
 		UserOnlineIP:  new(sync.Map),
 		UserLimitInfo: new(sync.Map),
 		ConnLimiter:   NewConnLimiter(l.ConnLimit, l.IPLimit, l.EnableRealtime),
 		SpeedLimiter:  new(sync.Map),
+		AliveList:     aliveList,
 	}
 	uuidmap := make(map[string]int)
 	for i := range users {
@@ -163,18 +165,23 @@ func (l *Limiter) CheckLimit(taguuid string, ip string, isTcp bool, noSSUDP bool
 		// Store online user for device limit
 		ipMap := new(sync.Map)
 		ipMap.Store(ip, uid)
+		aliveIp := l.AliveList[uid]
 		// If any device is online
 		if v, ok := l.UserOnlineIP.LoadOrStore(taguuid, ipMap); ok {
 			ipMap := v.(*sync.Map)
 			// If this is a new ip
 			if _, ok := ipMap.LoadOrStore(ip, uid); !ok {
-				counter := 0
-				ipMap.Range(func(key, value interface{}) bool {
-					counter++
-					return true
-				})
-				if counter > deviceLimit && deviceLimit > 0 {
-					ipMap.Delete(ip)
+				if deviceLimit > 0 {
+					if deviceLimit <= aliveIp {
+						ipMap.Delete(ip)
+						return nil, true
+					}
+				}
+			}
+		} else {
+			if deviceLimit > 0 {
+				if deviceLimit <= aliveIp {
+					l.UserOnlineIP.Delete(taguuid)
 					return nil, true
 				}
 			}
@@ -218,23 +225,3 @@ type UserIpList struct {
 	Uid    int      `json:"Uid"`
 	IpList []string `json:"Ips"`
 }
-
-func determineDeviceLimit(nodeLimit, userLimit int) (limit int) {
-	if nodeLimit == 0 || userLimit == 0 {
-		if nodeLimit > userLimit {
-			return nodeLimit
-		} else if nodeLimit < userLimit {
-			return userLimit
-		} else {
-			return 0
-		}
-	} else {
-		if nodeLimit > userLimit {
-			return userLimit
-		} else if nodeLimit < userLimit {
-			return nodeLimit
-		} else {
-			return nodeLimit
-		}
-	}
-}
diff --git a/node/controller.go b/node/controller.go
index e8aa29d..9947b06 100644
--- a/node/controller.go
+++ b/node/controller.go
@@ -19,6 +19,7 @@ type Controller struct {
 	limiter                   *limiter.Limiter
 	traffic                   map[string]int64
 	userList                  []panel.UserInfo
+	aliveMap                  map[int]int
 	info                      *panel.NodeInfo
 	nodeInfoMonitorPeriodic   *task.Task
 	userReportPeriodic        *task.Task
@@ -54,6 +55,10 @@ func (c *Controller) Start() error {
 	if len(c.userList) == 0 {
 		return errors.New("add users error: not have any user")
 	}
+	c.aliveMap, err = c.apiClient.GetUserAlive()
+	if err != nil {
+		return fmt.Errorf("failed to get user alive list: %s", err)
+	}
 	if len(c.Options.Name) == 0 {
 		c.tag = c.buildNodeTag(node)
 	} else {
@@ -61,7 +66,7 @@ func (c *Controller) Start() error {
 	}
 
 	// add limiter
-	l := limiter.AddLimiter(c.tag, &c.LimitConfig, c.userList)
+	l := limiter.AddLimiter(c.tag, &c.LimitConfig, c.userList, c.aliveMap)
 	// add rule limiter
 	if err = l.UpdateRule(&node.Rules); err != nil {
 		return fmt.Errorf("update rule error: %s", err)
diff --git a/node/task.go b/node/task.go
index 51c12f2..5cee41d 100644
--- a/node/task.go
+++ b/node/task.go
@@ -68,6 +68,11 @@ func (c *Controller) nodeInfoMonitor() (err error) {
 		}).Error("Get user list failed")
 		return nil
 	}
+	// get user alive
+	newA, err := c.apiClient.GetUserAlive()
+	if err != nil {
+		return err
+	}
 	if newN != nil {
 		c.info = newN
 		// nodeInfo changed
@@ -92,7 +97,7 @@ func (c *Controller) nodeInfoMonitor() (err error) {
 			// Remove Old limiter
 			limiter.DeleteLimiter(c.tag)
 			// Add new Limiter
-			l := limiter.AddLimiter(c.tag, &c.LimitConfig, c.userList)
+			l := limiter.AddLimiter(c.tag, &c.LimitConfig, c.userList, newA)
 			c.limiter = l
 		}
 		// Update rule
@@ -154,7 +159,10 @@ func (c *Controller) nodeInfoMonitor() (err error) {
 		// exit
 		return nil
 	}
-
+	// update alive list
+	if newA != nil {
+		c.limiter.AliveList = newA
+	}
 	// node no changed, check users
 	if len(newU) == 0 {
 		return nil