diff --git a/pkg/compute/models/guestnetworks.go b/pkg/compute/models/guestnetworks.go
index 445a5d7097..e2543d446e 100644
--- a/pkg/compute/models/guestnetworks.go
+++ b/pkg/compute/models/guestnetworks.go
@@ -296,6 +296,13 @@ func (manager *SGuestnetworkManager) newGuestNetwork(
 	lockman.LockObject(ctx, network)
 	defer lockman.ReleaseObject(ctx, network)
 
+	vpc := network.GetVpc()
+	if vpc == nil {
+		return nil, fmt.Errorf("cannot find vpc of network %s(%s)", network.Id, network.Name)
+	}
+
+	provider := vpc.GetProviderName()
+
 	macAddr, err := manager.GenerateMac(network.Id, mac)
 	if err != nil {
 		return nil, err
@@ -317,7 +324,7 @@ func (manager *SGuestnetworkManager) newGuestNetwork(
 			// if reuse Ip address, no need to check address availability
 			// assign it anyway
 			gn.IpAddr = address
-		} else {
+		} else if provider == api.CLOUD_PROVIDER_ONECLOUD || options.Options.EnablePreAllocateIpAddr {
 			addrTable := network.GetUsedAddresses()
 			recentAddrTable := manager.getRecentlyReleasedIPAddresses(network.Id, network.getAllocTimoutDuration())
 			ipAddr, err := network.GetFreeIP(ctx, userCred, addrTable, recentAddrTable, address, allocDir, reserved)
@@ -330,9 +337,7 @@ func (manager *SGuestnetworkManager) newGuestNetwork(
 			gn.IpAddr = ipAddr
 		}
 
-		if vpc := network.GetVpc(); vpc == nil {
-			return nil, fmt.Errorf("cannot find vpc of network %s(%s)", network.Id, network.Name)
-		} else if vpc.Id != api.DEFAULT_VPC_ID && vpc.GetProviderName() == api.CLOUD_PROVIDER_ONECLOUD {
+		if vpc.Id != api.DEFAULT_VPC_ID && provider == api.CLOUD_PROVIDER_ONECLOUD {
 			var err error
 			GuestnetworkManager.lockAllocMappedAddr(ctx)
 			defer GuestnetworkManager.unlockAllocMappedAddr(ctx)
@@ -817,11 +822,11 @@ func (self *SGuestnetwork) getMtu(net *SNetwork) int {
 }
 
 func (self *SGuestnetwork) IsAllocated() bool {
-	if regutils.MatchMacAddr(self.MacAddr) && (self.Virtual || regutils.MatchIP4Addr(self.IpAddr)) {
+	provider := self.GetGuest().getRegion().Provider
+	if regutils.MatchMacAddr(self.MacAddr) && (self.Virtual || regutils.MatchIP4Addr(self.IpAddr) || (provider != api.CLOUD_PROVIDER_ONECLOUD && !options.Options.EnablePreAllocateIpAddr)) {
 		return true
-	} else {
-		return false
 	}
+	return false
 }
 
 func GetIPTenantIdPairs() {
diff --git a/pkg/compute/models/guests.go b/pkg/compute/models/guests.go
index bbe8a1ff5a..8ef59105c4 100644
--- a/pkg/compute/models/guests.go
+++ b/pkg/compute/models/guests.go
@@ -3020,9 +3020,15 @@ func (self *SGuest) SyncVMNics(ctx context.Context, userCred mcclient.TokenCrede
 					if len(guestnics[i].IpAddr) > 0 && guestnics[i].IpAddr == vnics[i].GetIP() {
 						// mac changed
 						reserve = true
+						removed = append(removed, sRemoveGuestnic{nic: &guestnics[i], reserve: reserve})
+						adds = append(adds, sAddGuestnic{index: i, nic: vnics[i], net: localNet, reserve: reserve})
+					} else if len(guestnics[i].IpAddr) == 0 {
+						db.Update(&guestnics[i], func() error {
+							guestnics[i].IpAddr = vnics[i].GetIP()
+							guestnics[i].MacAddr = vnics[i].GetMAC()
+							return nil
+						})
 					}
-					removed = append(removed, sRemoveGuestnic{nic: &guestnics[i], reserve: reserve})
-					adds = append(adds, sAddGuestnic{index: i, nic: vnics[i], net: localNet, reserve: reserve})
 				}
 			} else {
 				removed = append(removed, sRemoveGuestnic{nic: &guestnics[i]})
@@ -3086,7 +3092,7 @@ func (self *SGuest) SyncVMNics(ctx context.Context, userCred mcclient.TokenCrede
 			TryReserved:         true,
 			AllocDir:            api.IPAllocationDefault,
 			RequireDesignatedIP: true,
-			UseDesignatedIP:     false,
+			UseDesignatedIP:     true,
 			NicConfs:            []SNicConfig{nicConf},
 		})
 		if err != nil {
diff --git a/pkg/compute/options/options.go b/pkg/compute/options/options.go
index ce77bf07dc..fea412855e 100644
--- a/pkg/compute/options/options.go
+++ b/pkg/compute/options/options.go
@@ -114,6 +114,8 @@ type ComputeOptions struct {
 	SyncCloudImagesDay  int `default:"1" help:"Days auto sync public cloud images data, default 1 day"`
 	SyncCloudImagesHour int `default:"3" help:"What hour start sync public cloud images, default 03:00"`
 
+	EnablePreAllocateIpAddr bool `help:"Enable private and public cloud private ip pre allocate, default true" default:"true"`
+
 	DefaultImageCacheDir string `default:"image_cache"`
 
 	SnapshotCreateDiskProtocol string `help:"Snapshot create disk protocol" choices:"url|fuse" default:"fuse"`