diff --git a/cli/client.go b/cli/client.go
index 91855b4..100bb0b 100644
--- a/cli/client.go
+++ b/cli/client.go
@@ -4,6 +4,9 @@ import (
 	"bufio"
 	"fmt"
 	"github.com/go-basic/uuid"
+	"unicode/utf8"
+
+	//"github.com/go-basic/uuid"
 	"log"
 	"net"
 	"os"
@@ -257,7 +260,7 @@ a:
 	} else if len(vs) > 1 {
 		data := "*" + strconv.Itoa(len(vs)) + "\r\n"
 		for _, v := range vs {
-			data += "$" + strconv.Itoa(len(v)) + "\r\n"
+			data += "$" + strconv.Itoa(utf8.RuneCountInString(v)) + "\r\n"
 			data += v + "\r\n"
 		}
 		_, err = c.conn.Write([]byte(data))
@@ -341,6 +344,9 @@ func (c *Client) receive() {
 
 			continue
 		case "+": // +pong, +xxx
+			if strings.EqualFold("+ping", string(v)) {
+				// c.send("+pong")
+			}
 		case "-":
 			fmt.Println("error:", string(v))
 		case ":":
diff --git a/zsub/msg-consumer.go b/zsub/msg-consumer.go
index 91ac3d7..6256ace 100644
--- a/zsub/msg-consumer.go
+++ b/zsub/msg-consumer.go
@@ -4,6 +4,7 @@ import (
 	"log"
 	"strconv"
 	"strings"
+	"time"
 	"zhub/conf"
 )
 
@@ -22,6 +23,12 @@ func msgAccept(v Message) {
 		return
 	}
 
+	// ping reply
+	if strings.EqualFold("+pong", v.Rcmd[0]) {
+		v.Conn.pong = time.Now().Unix()
+		return
+	}
+
 	if conf.LogDebug {
 		log.Println("rcmd: " + strings.Join(rcmd, " "))
 	}
diff --git a/zsub/zsub.go b/zsub/zsub.go
index 77d2620..372198f 100644
--- a/zsub/zsub.go
+++ b/zsub/zsub.go
@@ -19,15 +19,56 @@ var (
 		timers: make(map[string]*ZTimer),
 		delays: make(map[string]*ZDelay),
 		locks:  make(map[string][]*Lock),
+		conns:  make([]*ZConn, 0),
 	}
 )
 
+func init() {
+	// conn health check: T=10s, close>29s
+	go func() {
+		ticker := time.NewTicker(time.Second * 10)
+		defer ticker.Stop()
+
+		for range ticker.C {
+			funChan <- func() {
+				defer func() {
+					if r := recover(); r != nil {
+						log.Println("conn health check Recovered:", r)
+					}
+				}()
+				conns := make([]*ZConn, 0) // 需要关闭的连接
+				for _, c := range zsub.conns {
+					if c.ping > 0 && c.ping-c.pong > 19 {
+						conns = c.appendTo(conns)
+						continue
+					}
+
+					c.ping = time.Now().Unix()
+					if c.pong == 0 {
+						c.pong = c.ping
+					}
+
+					c.send("+ping")
+				}
+
+				// close
+				for _, c := range conns {
+					log.Println("========================================= conn ping close:", (*c.conn).RemoteAddr(), "[", c.groupid, "] =========================================")
+					c.close()
+				}
+
+			}
+		}
+	}()
+}
+
 type ZSub struct {
 	sync.RWMutex
 	topics map[string]*ZTopic
 	timers map[string]*ZTimer
 	delays map[string]*ZDelay
 	locks  map[string][]*Lock
+	conns  []*ZConn
 }
 
 type ZConn struct { //ZConn
@@ -38,6 +79,8 @@ type ZConn struct { //ZConn
 	timers    []string            // 订阅、定时调度分别创建各自连接
 	stoped    chan int            // 关闭信号量
 	substoped map[string]chan int // 关闭信号量
+	ping      int64               // 最后心跳时间
+	pong      int64               // 最后心跳回复时间
 }
 
 type Lock struct {
@@ -181,6 +224,18 @@ func (c *ZConn) appendTo(arr []*ZConn) []*ZConn {
 	return append(arr, c)
 }
 
+func (c *ZConn) removeTo(arr []*ZConn) []*ZConn {
+	if arr == nil {
+		arr = make([]*ZConn, 0)
+	}
+	for i, item := range arr {
+		if item == c {
+			arr = append(arr[:i], arr[i+1:]...)
+		}
+	}
+	return arr
+}
+
 // ServerStart ==================  ZHub server =====================================
 /*
 1、初始化服务
@@ -232,9 +287,20 @@ func (s *ZSub) acceptHandler(c *ZConn) {
 		}
 	}()
 	defer func() {
-		c.close() // close ZConn
+		// conn remove to conns
+		funChan <- func() {
+			zsub.conns = c.removeTo(zsub.conns)
+		}
+
+		// close ZConn
+		c.close()
 	}()
 
+	// conn add to conns
+	funChan <- func() {
+		zsub.conns = c.appendTo(zsub.conns)
+	}
+
 	reader := bufio.NewReader(*c.conn)
 	for {
 		rcmd := make([]string, 0)