diff --git a/pkg/hostman/guestman/guesttasks.go b/pkg/hostman/guestman/guesttasks.go
index 680c52af65..469b2d7da4 100644
--- a/pkg/hostman/guestman/guesttasks.go
+++ b/pkg/hostman/guestman/guesttasks.go
@@ -659,6 +659,12 @@ func (n *SGuestNetworkSyncTask) Start(callback func(...error)) {
 		}
 		n.addNicMacs = addNicMacs
 		n.addNicConfs = addNicConfs
+
+		// deploy nics configure before do add nics
+		allNics := append(n.guest.Desc.Nics, n.addNics...)
+		if err := n.guest.QgaDeployNicsConfigure(allNics); err != nil {
+			log.Errorf("failed do QgaDeployNicsConfigure %s", err)
+		}
 	}
 
 	n.delNicCnt = len(n.delNics)
@@ -677,6 +683,7 @@ func (n *SGuestNetworkSyncTask) syncNetworkConf() {
 	} else {
 		func() {
 			if len(n.addNicMacs) > 0 || n.delNicCnt > 0 {
+				// redeploy nics config after add/del nics
 				if err := n.guest.QgaDeployNicsConfigure(n.guest.Desc.Nics); err != nil {
 					log.Errorf("failed do QgaDeployNicsConfigure %s", err)
 					return
@@ -684,7 +691,7 @@ func (n *SGuestNetworkSyncTask) syncNetworkConf() {
 			}
 			if len(n.addNicMacs) > 0 {
 				// try restart added nics, wait for added nic ready
-				time.Sleep(3 * time.Second)
+				time.Sleep(6 * time.Second)
 				if err := n.qgaRestartAddedNics(); err != nil {
 					log.Errorf("failed qgaRestartAddedNics %s", err)
 					return
diff --git a/pkg/hostman/hostmetrics/hostmetrics.go b/pkg/hostman/hostmetrics/hostmetrics.go
index e38d1850d1..eb26e5c80d 100644
--- a/pkg/hostman/hostmetrics/hostmetrics.go
+++ b/pkg/hostman/hostmetrics/hostmetrics.go
@@ -470,6 +470,9 @@ type GuestMetrics struct {
 func (d *GuestMetrics) mapToStatStr(m map[string]interface{}) string {
 	var statArr = []string{}
 	for k, v := range m {
+		if vs, ok := v.(string); ok && len(vs) == 0 {
+			continue
+		}
 		statArr = append(statArr, fmt.Sprintf("%s=%v", k, v))
 	}
 	return strings.Join(statArr, ",")
@@ -480,6 +483,9 @@ func (d *GuestMetrics) netioToTelegrafData(measurement string, tagStr string) []
 	for i := range d.VmNetio {
 		netTagMap := d.VmNetio[i].ToTag()
 		for k, v := range netTagMap {
+			if len(k) == 0 || len(v) == 0 {
+				continue
+			}
 			tagStr = fmt.Sprintf("%s,%s=%s", tagStr, k, v)
 		}
 		res = append(res, fmt.Sprintf("%s,%s %s", measurement, tagStr, d.mapToStatStr(d.VmNetio[i].ToMap())))