diff --git a/bihs_live.go b/bihs_live.go
index 8efed7a..47b967a 100644
--- a/bihs_live.go
+++ b/bihs_live.go
@@ -22,20 +22,20 @@ func (hs *HotStuff) loop() {
 		case proposal := <-hs.proposeCh:
 
 			if !hs.isLeader(hs.height, hs.view) {
-				hs.conf.Logger.Errorf("proposer(%s) not in turn, height(%d) view(%d)", hs.conf.ProposerID, hs.height, hs.view)
+				hs.conf.Logger.Errorf("proposer(%d) tried to propose when not in turn, height(%d) view(%d)", hs.idx, hs.height, hs.view)
 				continue
 			}
-			if hs.view != 0 {
-				hs.conf.Logger.Errorf("proposal(%s) Propose not in view 0", hs.conf.ProposerID)
+			if !hs.conf.Promiscuous && hs.view != 0 {
+				hs.conf.Logger.Errorf("proposer(%d) tried to propose when not in view 0 in bivalent mode", hs.idx)
 				continue
 			}
 			switch {
 			case proposal.Height() < hs.height:
-				hs.conf.Logger.Errorf("proposal(%s) Propose height decrease, proposal.height=%d, hs.height=%d", hs.conf.ProposerID, proposal.Height(), hs.height)
+				hs.conf.Logger.Errorf("proposer(%d) proposal height decrease, proposal.height=%d, hs.height=%d", hs.idx, proposal.Height(), hs.height)
 				continue
 			case proposal.Height() == hs.height:
-				if hs.candidateBlk != nil {
-					hs.conf.Logger.Errorf("proposal(%s) Propose twice in the same height, last:%v, current:%v", hs.conf.ProposerID, hs.candidateBlk.Hash(), proposal.Hash())
+				if hs.hasVotedPrepare {
+					hs.conf.Logger.Errorf("proposer(%d) has voted prepare in the current height(%d) and view(%d), last:%v, current:%v", hs.idx, hs.height, hs.view, hs.candidateBlk.Hash(), proposal.Hash())
 					continue
 				}
 			case proposal.Height() > hs.height:
@@ -208,7 +208,7 @@ func (hs *HotStuff) relayPropose() {
 		return
 	}
 
-	blk, err := hs.store.EmptyBlock(hs.height)
+	blk, err := hs.store.MakeBlock(hs.height, !hs.conf.Promiscuous && hs.view > 0)
 	if err != nil {
 		hs.conf.Logger.Errorf("proposer %d EmptyBlock failed:%v", hs.idx, err)
 		return
diff --git a/bihs_safe.go b/bihs_safe.go
index 9fd463f..db6f4db 100644
--- a/bihs_safe.go
+++ b/bihs_safe.go
@@ -60,6 +60,11 @@ func (hs *HotStuff) onProposal(blk Block, qc *QC) {
 	hs.p2p.Broadcast(prepareMsg)
 
 	hs.onRecvPrepareVote(hs.conf.ProposerID, hs.idx, prepareMsg)
+
+	if hs.relayTimer != nil {
+		hs.relayTimer.Stop()
+		hs.relayTimer = nil
+	}
 }
 
 func (hs *HotStuff) onRecvPrepare(sender ID, idx int, msg *Msg) {
@@ -74,6 +79,11 @@ func (hs *HotStuff) onRecvPrepare(sender ID, idx int, msg *Msg) {
 		return
 	}
 
+	if !bytes.Equal(hs.store.SelectLeader(msg.Node.Blk.Height(), hs.view), sender) {
+		hs.conf.Logger.Errorf("proposer %s tried to propose when not in turn", sender)
+		return
+	}
+
 	if msg.Node.Blk.Height() != msg.Height {
 		hs.conf.Logger.Errorf("prepare block height(%d) != msg height(%d)", msg.Node.Blk.Height(), msg.Height)
 		return
@@ -83,17 +93,14 @@ func (hs *HotStuff) onRecvPrepare(sender ID, idx int, msg *Msg) {
 		return
 	}
 
-	switch {
-	case msg.View == 0:
-		if !msg.Node.Blk.Empty() && !bytes.Equal(hs.store.SelectLeader(msg.Node.Blk.Height(), 0), sender) {
-			hs.conf.Logger.Errorf("proposer %s tried to propose when not in turn", sender)
-			return
-		}
-	case msg.View > 0:
-		if !msg.Node.Blk.Empty() && msg.Justify == nil {
-			hs.conf.Logger.Errorf("proposer %s tried to relay propose with no qc", sender)
-			return
+	if msg.View > 0 {
+		if !hs.conf.Promiscuous {
+			if !msg.Node.Blk.Empty() && msg.Justify == nil {
+				hs.conf.Logger.Errorf("proposer %s tried to relay propose with no qc when in bivalent mode", sender)
+				return
+			}
 		}
+
 		if msg.Justify != nil {
 			err := msg.Justify.validate(hs)
 			if err != nil {
diff --git a/bihs_test.go b/bihs_test.go
index 6ae8aa3..cec10f3 100644
--- a/bihs_test.go
+++ b/bihs_test.go
@@ -132,7 +132,7 @@ func (db *HappyDB) ValidatorIndex(height uint64, peer ID) int {
 func (db *HappyDB) SelectLeader(height, view uint64) ID {
 	return ID([]byte(fmt.Sprintf("%d", (height+view)%uint64(db.validators))))
 }
-func (db *HappyDB) EmptyBlock(height uint64) (Block, error) {
+func (db *HappyDB) MakeBlock(height uint64, mustEmpty bool) (Block, error) {
 	b := EmptyBlock(height)
 	return &b, nil
 }
diff --git a/type.go b/type.go
index ebd1a1c..48d51f3 100644
--- a/type.go
+++ b/type.go
@@ -323,10 +323,9 @@ type StateDB interface {
 	Height() uint64
 	SubscribeHeightChange(HeightChangeSub)
 	UnSubscribeHeightChange(HeightChangeSub)
-
+	MakeBlock(height uint64, mustEmpty bool) (Block, error)
 	ValidatorIndex(height uint64, peer ID) int
 	SelectLeader(height, view uint64) ID
-	EmptyBlock(height uint64) (Block, error)
 	ValidatorCount(height uint64) int32
 	ValidatorIDs(height uint64) []ID
 
@@ -361,6 +360,7 @@ type Config struct {
 	BlockInterval time.Duration
 	ProposerID    ID
 	DataDir       string
+	Promiscuous   bool
 
 	EcSigner         EcSigner
 	BlsSigner        BlsSigner