diff --git a/cmd/init.go b/cmd/init.go
index 8900d20..5aeaa79 100644
--- a/cmd/init.go
+++ b/cmd/init.go
@@ -114,7 +114,12 @@ var initCmd = &cli.Command{
 			return err
 		}
 
-		if err := storageMinerInit(cctx, r, &fullnode); err != nil {
+		networkParams, err := fullNodeAPI.StateGetNetworkParams(ctx)
+		if err != nil {
+			return err
+		}
+
+		if err := storageMinerInit(cctx, r, &fullnode, networkParams.BlockDelaySecs); err != nil {
 			log.Errorf("Failed to initialize sophon-miner: %+v", err)
 			path, err := homedir.Expand(repoPath)
 			if err != nil {
@@ -133,7 +138,7 @@ var initCmd = &cli.Command{
 	},
 }
 
-func storageMinerInit(cctx *cli.Context, r repo.Repo, fn *config.APIInfo) error {
+func storageMinerInit(cctx *cli.Context, r repo.Repo, fn *config.APIInfo, blockDelay uint64) error {
 	lr, err := r.Lock()
 	if err != nil {
 		return err
@@ -180,6 +185,17 @@ func storageMinerInit(cctx *cli.Context, r repo.Repo, fn *config.APIInfo) error
 		cfg.API.ListenAddress = ma.String()
 		cfg.SlashFilter.Type = sfType
 		cfg.SlashFilter.MySQL.Conn = cctx.String("mysql-conn")
+
+		// set the default value of PropagationDelaySecs based on experience.
+		switch blockDelay {
+		case 30:
+			cfg.PropagationDelaySecs = 12
+		case 4:
+			cfg.PropagationDelaySecs = 1
+		default:
+			cfg.PropagationDelaySecs = blockDelay / 2
+		}
+
 	}); err != nil {
 		return fmt.Errorf("modify config failed: %w", err)
 	}
diff --git a/miner/multiminer.go b/miner/multiminer.go
index ce6a0f8..d8e4317 100644
--- a/miner/multiminer.go
+++ b/miner/multiminer.go
@@ -595,16 +595,29 @@ func (m *Miner) getLatestBase(ctx context.Context) (*MiningBase, time.Duration,
 	var onDone func(bool, abi.ChainEpoch, error)
 	var injectNulls abi.ChainEpoch
 
+	// overlapCount is used to avoid getting stuck in an endless loop
+	overlapCount := 0
+
 	for {
 		prebase, err := m.GetBestMiningCandidate(ctx)
 		if err != nil {
 			return nil, time.Second * 5, fmt.Errorf("get best mining candidate: %w", err)
 		}
 
-		if base != nil && base.TipSet.Height() == prebase.TipSet.Height() && base.NullRounds == prebase.NullRounds {
-			base = prebase
-			break
+		if base != nil {
+			if base.TipSet.Height() == prebase.TipSet.Height() && base.NullRounds == prebase.NullRounds {
+				base = prebase
+				break
+			} else {
+				if overlapCount >= 5 {
+					log.Warnf("wait to long (about %d epochs) to get mining base, please check your config of PropagationDelaySecs and network", base.TipSet.Height()+base.NullRounds-prebase.TipSet.Height()+prebase.NullRounds)
+					overlapCount = 0
+				} else {
+					overlapCount++
+				}
+			}
 		}
+
 		if base != nil {
 			onDone(false, 0, nil)
 		}