diff --git a/pkg/cloudcommon/db/caller.go b/pkg/cloudcommon/db/caller.go
index b5b8f7ae25..7aea5a6b11 100644
--- a/pkg/cloudcommon/db/caller.go
+++ b/pkg/cloudcommon/db/caller.go
@@ -213,13 +213,29 @@ func mergeInputOutputData(data *jsonutils.JSONDict, resVal reflect.Value) *jsonu
 	jsonMap, _ := retJson.GetMap()
 	for k, v := range jsonMap {
 		if output.Contains(k) {
-			if v == jsonutils.JSONNull || v.IsZero() {
+			if v == jsonutils.JSONNull {
 				output.Remove(k)
-			} else if !v.IsZero() {
-				output.Set(k, v)
+			} else {
+				switch v.(type) {
+				case *jsonutils.JSONString:
+					if v.IsZero() {
+						output.Remove(k)
+					} else {
+						output.Set(k, v)
+					}
+				default:
+					output.Set(k, v)
+				}
+			}
+		} else if v != jsonutils.JSONNull {
+			switch v.(type) {
+			case *jsonutils.JSONString:
+				if !v.IsZero() {
+					output.Add(v, k)
+				}
+			default:
+				output.Add(v, k)
 			}
-		} else if !v.IsZero() {
-			output.Add(v, k)
 		}
 	}
 	log.Debugf("output: %s", output)
diff --git a/pkg/hostman/hostinfo/hostdhcp/dhcpserver.go b/pkg/hostman/hostinfo/hostdhcp/dhcpserver.go
index 94f3e3d647..e7704b3428 100644
--- a/pkg/hostman/hostinfo/hostdhcp/dhcpserver.go
+++ b/pkg/hostman/hostinfo/hostdhcp/dhcpserver.go
@@ -24,11 +24,9 @@ import (
 	"yunion.io/x/log"
 	"yunion.io/x/pkg/util/netutils"
 
-	identityapi "yunion.io/x/onecloud/pkg/apis/identity"
 	"yunion.io/x/onecloud/pkg/cloudcommon/types"
 	guestman "yunion.io/x/onecloud/pkg/hostman/guestman/types"
 	"yunion.io/x/onecloud/pkg/hostman/options"
-	"yunion.io/x/onecloud/pkg/mcclient/auth"
 	"yunion.io/x/onecloud/pkg/util/dhcp"
 	"yunion.io/x/onecloud/pkg/util/netutils2"
 )
@@ -143,7 +141,7 @@ func (s *SGuestDHCPServer) getGuestConfig(guestDesc, guestNic jsonutils.JSONObje
 		}
 	}
 
-	if len(nicdesc.NTPServers) > 0 {
+	if len(nicdesc.Ntp) > 0 {
 		conf.NTPServers = make([]net.IP, 0)
 		for _, ntp := range strings.Split(nicdesc.Ntp, ",") {
 			conf.NTPServers = append(conf.NTPServers, net.ParseIP(ntp))
diff --git a/pkg/vpcagent/ovn/keeper.go b/pkg/vpcagent/ovn/keeper.go
index 6e9a6ca205..882e418de9 100644
--- a/pkg/vpcagent/ovn/keeper.go
+++ b/pkg/vpcagent/ovn/keeper.go
@@ -17,7 +17,6 @@ package ovn
 import (
 	"context"
 	"fmt"
-	"net"
 	"sort"
 	"strings"
 
@@ -28,7 +27,6 @@ import (
 	"yunion.io/x/pkg/errors"
 
 	apis "yunion.io/x/onecloud/pkg/apis/compute"
-	identityapi "yunion.io/x/onecloud/pkg/apis/identity"
 	"yunion.io/x/onecloud/pkg/mcclient/auth"
 	agentmodels "yunion.io/x/onecloud/pkg/vpcagent/models"
 	"yunion.io/x/onecloud/pkg/vpcagent/options"