diff --git a/weed/storage/disk_location_ec.go b/weed/storage/disk_location_ec.go
index b63d88de4d2..28e150994c4 100644
--- a/weed/storage/disk_location_ec.go
+++ b/weed/storage/disk_location_ec.go
@@ -203,6 +203,8 @@ func (l *DiskLocation) closeEcVolumeById(vid needle.VolumeId) {
 }
 
 func (l *DiskLocation) deleteEcVolumeById(vid needle.VolumeId) (e error) {
+	l.ecVolumesLock.Lock()
+	defer l.ecVolumesLock.Unlock()
 	ecVolume, ok := l.ecVolumes[vid]
 	if !ok {
 		return
diff --git a/weed/storage/store.go b/weed/storage/store.go
index b48177befa0..f7f2e5ebe57 100644
--- a/weed/storage/store.go
+++ b/weed/storage/store.go
@@ -388,24 +388,35 @@ func (s *Store) CollectHeartbeat() *master_pb.Heartbeat {
 
 func (s *Store) deleteExpiredEcVolumes() (ecShards, deleted []*master_pb.VolumeEcShardInformationMessage) {
 	for _, location := range s.Locations {
-		for _, ev := range location.ecVolumes {
-			messages := ev.ToVolumeEcShardInformationMessage()
-			if ev.IsTimeToDestroy() {
-				err := location.deleteEcVolumeById(ev.VolumeId)
-				if err != nil {
-					ecShards = append(ecShards, messages...)
-					glog.Errorf("delete EcVolume err %d: %v", ev.VolumeId, err)
-					continue
-				}
-				deleted = append(deleted, messages...)
-			} else {
-				ecShards = append(ecShards, messages...)
+		toDeleteEcVolume := s.prepareDeleteExpiredEcVolumesInLocation(location, ecShards)
+		for _, ev := range toDeleteEcVolume {
+			err := location.deleteEcVolumeById(ev.VolumeId)
+			if err != nil {
+				ecShards = append(ecShards, ev.ToVolumeEcShardInformationMessage()...)
+				glog.Errorf("delete EcVolume err %d: %v", ev.VolumeId, err)
+				continue
 			}
+			deleted = append(deleted, ev.ToVolumeEcShardInformationMessage()...)
 		}
 	}
 	return
 }
 
+// prepareDeleteExpiredEcVolumesInLocation 计算ec volume是否达到删除时间，然后返回需要删除的ec volume列表，不需要删除的添加到ecShards中
+func (s *Store) prepareDeleteExpiredEcVolumesInLocation(location *DiskLocation, ecShards []*master_pb.VolumeEcShardInformationMessage) []*erasure_coding.EcVolume {
+	var toDeleteEcVolume []*erasure_coding.EcVolume
+	location.ecVolumesLock.RLock()
+	defer location.ecVolumesLock.RUnlock()
+	for _, ev := range location.ecVolumes {
+		if ev.IsTimeToDestroy() {
+			toDeleteEcVolume = append(toDeleteEcVolume, ev)
+		} else {
+			ecShards = append(ecShards, ev.ToVolumeEcShardInformationMessage()...)
+		}
+	}
+	return toDeleteEcVolume
+}
+
 func (s *Store) SetStopping() {
 	s.isStopping = true
 	for _, location := range s.Locations {