diff --git a/pkg/compute/models/hosts.go b/pkg/compute/models/hosts.go
index a5f8164269..5b5617b28c 100644
--- a/pkg/compute/models/hosts.go
+++ b/pkg/compute/models/hosts.go
@@ -3555,3 +3555,34 @@ func (self *SHost) GetShortDesc(ctx context.Context) *jsonutils.JSONDict {
 	desc.Update(jsonutils.Marshal(&info))
 	return desc
 }
+
+func (self *SHost) MarkGuestUnknown(userCred mcclient.TokenCredential) {
+	log.Errorln(self.GetGuests())
+	for _, guest := range self.GetGuests() {
+		guest.SetStatus(userCred, VM_UNKNOWN, "host offline")
+	}
+}
+
+func (manager *SHostManager) PingDetectionTask(ctx context.Context, userCred mcclient.TokenCredential, isStart bool) {
+	deadline := time.Now().Add(-1 * time.Duration(options.Options.HostOfflineMaxSeconds) * time.Second)
+
+	q := manager.Query().Equals("host_status", HOST_ONLINE).
+		Equals("host_type", HOST_TYPE_HYPERVISOR)
+	q = q.Filter(sqlchemy.OR(sqlchemy.IsNull(q.Field("last_ping_at")),
+		sqlchemy.LT(q.Field("last_ping_at"), deadline)))
+
+	rows, err := q.Rows()
+	if err != nil {
+		log.Errorln(err)
+		return
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var host = SHost{}
+		q.Row2Struct(rows, &host)
+		host.SetModelManager(manager)
+		host.PerformOffline(ctx, userCred, nil, nil)
+		host.MarkGuestUnknown(userCred)
+	}
+}
diff --git a/pkg/compute/options/options.go b/pkg/compute/options/options.go
index 3e369f6527..cf2e426f91 100644
--- a/pkg/compute/options/options.go
+++ b/pkg/compute/options/options.go
@@ -76,6 +76,9 @@ type ComputeOptions struct {
 
 	SnapshotCreateDiskProtocol string `help:"Snapshot create disk protocol" choices:"url|fuse" default:"fuse"`
 
+	HostOfflineMaxSeconds        int `help:"Maximal seconds interval that a host considered offline during which it did not ping region, default is 3 minues" default:"180"`
+	HostOfflineDetectionInterval int `help:"Interval to check offline hosts, defualt is half a minute" default:"30"`
+
 	cloudcommon.DBOptions
 }
 
diff --git a/pkg/compute/service/service.go b/pkg/compute/service/service.go
index 398033c794..e803555a6e 100644
--- a/pkg/compute/service/service.go
+++ b/pkg/compute/service/service.go
@@ -3,6 +3,7 @@ package service
 import (
 	"os"
 	"time"
+
 	"yunion.io/x/onecloud/pkg/compute/skus"
 
 	"yunion.io/x/log"
@@ -60,6 +61,7 @@ func StartService() {
 			cron.AddJob1("CleanPendingDeleteDisks", time.Duration(options.Options.PendingDeleteCheckSeconds)*time.Second, models.DiskManager.CleanPendingDeleteDisks)
 			cron.AddJob1("CleanPendingDeleteLoadbalancers", time.Duration(options.Options.LoadbalancerPendingDeleteCheckInterval)*time.Second, models.LoadbalancerAgentManager.CleanPendingDeleteLoadbalancers)
 			cron.AddJob1("CleanPendingDeleteServers", time.Duration(options.Options.PrepaidExpireCheckSeconds)*time.Second, models.GuestManager.DeleteExpiredPrepaidServers)
+			cron.AddJob1("StartHostPingDetectionTask", time.Duration(options.Options.HostOfflineDetectionInterval)*time.Second, models.HostManager.PingDetectionTask)
 
 			cron.AddJob2("AutoDiskSnapshot", options.Options.AutoSnapshotDay, options.Options.AutoSnapshotHour, 0, 0, models.DiskManager.AutoDiskSnapshot, false)
 			cron.AddJob2("SyncSkus", options.Options.SyncSkusDay, options.Options.SyncSkusHour, 0, 0, skus.SyncSkus, true)
diff --git a/pkg/compute/tasks/baremetal_sync_status_task.go b/pkg/compute/tasks/baremetal_sync_status_task.go
index e94303a4ea..614572e78c 100644
--- a/pkg/compute/tasks/baremetal_sync_status_task.go
+++ b/pkg/compute/tasks/baremetal_sync_status_task.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 
 	"yunion.io/x/jsonutils"
+	"yunion.io/x/log"
 	"yunion.io/x/onecloud/pkg/cloudcommon/db"
 	"yunion.io/x/onecloud/pkg/cloudcommon/db/taskman"
 	"yunion.io/x/onecloud/pkg/compute/models"
@@ -76,14 +77,17 @@ func (self *BaremetalSyncAllGuestsStatusTask) OnInit(ctx context.Context, obj db
 }
 
 func (self *BaremetalSyncAllGuestsStatusTask) OnGuestSyncStatusComplete(ctx context.Context, baremetal *models.SHost, body jsonutils.JSONObject) {
-	guests := baremetal.GetGuests()
-	for _, guest := range guests {
-		if guest.Status == models.VM_UNKNOWN && guest.Hypervisor == models.HYPERVISOR_BAREMETAL {
+	var guests = make([]models.SGuest, 0)
+	for _, guest := range baremetal.GetGuests() {
+		if guest.Status == models.VM_UNKNOWN && guest.Hypervisor != models.HYPERVISOR_BAREMETAL {
 			guest.SetStatus(self.UserCred, models.VM_SYNCING_STATUS, "")
-			// GuestBatchSyncStatusTask
-			guest.StartSyncstatus(ctx, self.UserCred, "")
+			guests = append(guests, guest)
 		}
 	}
+	for _, guest := range guests {
+		guest.StartSyncstatus(ctx, self.UserCred, "")
+	}
+	log.Infof("All unknown guests syncstatus complete")
 	self.SetStageComplete(ctx, nil)
 }