diff --git a/consensus/checks.go b/consensus/checks.go
index 28da66ad7b..32f59fb938 100644
--- a/consensus/checks.go
+++ b/consensus/checks.go
@@ -68,7 +68,7 @@ func (consensus *Consensus) isRightBlockNumAndViewID(recvMsg *FBFTMessage) bool
 }
 
 func (consensus *Consensus) onAnnounceSanityChecks(recvMsg *FBFTMessage) bool {
-	logMsgs := consensus.FBFTLog.GetMessagesByTypeSeqView(
+	logMsgs := consensus.fBFTLog.GetMessagesByTypeSeqView(
 		msg_pb.MessageType_ANNOUNCE, recvMsg.BlockNum, recvMsg.ViewID,
 	)
 	if len(logMsgs) > 0 {
diff --git a/consensus/consensus.go b/consensus/consensus.go
index ddbea9ec46..09bdef51ae 100644
--- a/consensus/consensus.go
+++ b/consensus/consensus.go
@@ -46,7 +46,7 @@ type VerifyBlockFunc func(*types.Block) error
 type Consensus struct {
 	Decider quorum.Decider
 	// FBFTLog stores the pbft messages and blocks during FBFT process
-	FBFTLog *FBFTLog
+	fBFTLog *FBFTLog
 	// phase: different phase of FBFT protocol: pre-prepare, prepare, commit, finish etc
 	phase FBFTPhase
 	// current indicates what state a node is in
@@ -84,7 +84,7 @@ type Consensus struct {
 	// IgnoreViewIDCheck determines whether to ignore viewID check
 	IgnoreViewIDCheck *abool.AtomicBool
 	// consensus mutex
-	mutex sync.RWMutex
+	mutex *sync.RWMutex
 	// ViewChange struct
 	vc *viewChange
 	// Signal channel for proposing a new block and start new consensus
@@ -140,6 +140,13 @@ func (consensus *Consensus) Blockchain() core.BlockChain {
 	return consensus.registry.GetBlockchain()
 }
 
+func (consensus *Consensus) FBFTLog() FBFT {
+	return threadsafeFBFTLog{
+		log: consensus.fBFTLog,
+		mu:  consensus.mutex,
+	}
+}
+
 // ChainReader returns the chain reader.
 // This is mostly the same as Blockchain, but it returns only read methods, so we assume it's safe for concurrent use.
 func (consensus *Consensus) ChainReader() engine.ChainReader {
@@ -165,11 +172,11 @@ func (consensus *Consensus) Beaconchain() core.BlockChain {
 
 // VerifyBlock is a function used to verify the block and keep trace of verified blocks.
 func (consensus *Consensus) verifyBlock(block *types.Block) error {
-	if !consensus.FBFTLog.IsBlockVerified(block.Hash()) {
+	if !consensus.fBFTLog.IsBlockVerified(block.Hash()) {
 		if err := consensus.BlockVerifier(block); err != nil {
 			return errors.Errorf("Block verification failed: %s", err)
 		}
-		consensus.FBFTLog.MarkBlockVerified(block)
+		consensus.fBFTLog.MarkBlockVerified(block)
 	}
 	return nil
 }
@@ -261,21 +268,21 @@ func New(
 	Decider quorum.Decider, minPeers int, aggregateSig bool,
 ) (*Consensus, error) {
 	consensus := Consensus{
-		ShardID: shard,
+		mutex:           &sync.RWMutex{},
+		ShardID:         shard,
+		fBFTLog:         NewFBFTLog(),
+		phase:           FBFTAnnounce,
+		current:         State{mode: Normal},
+		Decider:         Decider,
+		registry:        registry,
+		MinPeers:        minPeers,
+		AggregateSig:    aggregateSig,
+		host:            host,
+		msgSender:       NewMessageSender(host),
+		BlockNumLowChan: make(chan struct{}, 1),
+		// FBFT timeout
+		consensusTimeout: createTimeout(),
 	}
-	consensus.Decider = Decider
-	consensus.registry = registry
-	consensus.MinPeers = minPeers
-	consensus.AggregateSig = aggregateSig
-	consensus.host = host
-	consensus.msgSender = NewMessageSender(host)
-	consensus.BlockNumLowChan = make(chan struct{}, 1)
-	// FBFT related
-	consensus.FBFTLog = NewFBFTLog()
-	consensus.phase = FBFTAnnounce
-	consensus.current = State{mode: Normal}
-	// FBFT timeout
-	consensus.consensusTimeout = createTimeout()
 
 	if multiBLSPriKey != nil {
 		consensus.priKey = multiBLSPriKey
diff --git a/consensus/consensus_service.go b/consensus/consensus_service.go
index af40c42bcb..5229f0ed31 100644
--- a/consensus/consensus_service.go
+++ b/consensus/consensus_service.go
@@ -575,7 +575,7 @@ func (consensus *Consensus) selfCommit(payload []byte) error {
 	copy(blockHash[:], payload[:32])
 
 	// Leader sign and add commit message
-	block := consensus.FBFTLog.GetBlockByHash(blockHash)
+	block := consensus.fBFTLog.GetBlockByHash(blockHash)
 	if block == nil {
 		return errGetPreparedBlock
 	}
diff --git a/consensus/consensus_test.go b/consensus/consensus_test.go
index d2397a64aa..697ba49525 100644
--- a/consensus/consensus_test.go
+++ b/consensus/consensus_test.go
@@ -22,7 +22,6 @@ func TestConsensusInitialization(t *testing.T) {
 	assert.NoError(t, err)
 
 	messageSender := &MessageSender{host: host, retryTimes: int(phaseDuration.Seconds()) / RetryIntervalInSec}
-	fbtLog := NewFBFTLog()
 	state := State{mode: Normal}
 
 	timeouts := createTimeout()
@@ -37,7 +36,7 @@ func TestConsensusInitialization(t *testing.T) {
 	assert.IsType(t, make(chan struct{}), consensus.BlockNumLowChan)
 
 	// FBFTLog
-	assert.Equal(t, fbtLog, consensus.FBFTLog)
+	assert.NotNil(t, consensus.FBFTLog())
 
 	assert.Equal(t, FBFTAnnounce, consensus.phase)
 
diff --git a/consensus/consensus_v2.go b/consensus/consensus_v2.go
index 262cbe37d6..38bb06ff4a 100644
--- a/consensus/consensus_v2.go
+++ b/consensus/consensus_v2.go
@@ -161,10 +161,10 @@ func (consensus *Consensus) finalCommit() {
 		network.Bytes,
 		network.FBFTMsg
 	commitSigAndBitmap := FBFTMsg.Payload
-	consensus.FBFTLog.AddVerifiedMessage(FBFTMsg)
+	consensus.fBFTLog.AddVerifiedMessage(FBFTMsg)
 	// find correct block content
 	curBlockHash := consensus.blockHash
-	block := consensus.FBFTLog.GetBlockByHash(curBlockHash)
+	block := consensus.fBFTLog.GetBlockByHash(curBlockHash)
 	if block == nil {
 		consensus.getLogger().Warn().
 			Str("blockHash", hex.EncodeToString(curBlockHash[:])).
@@ -278,7 +278,7 @@ func (consensus *Consensus) BlockCommitSigs(blockNum uint64) ([]byte, error) {
 	lastCommits, err := consensus.Blockchain().ReadCommitSig(blockNum)
 	if err != nil ||
 		len(lastCommits) < bls.BLSSignatureSizeInBytes {
-		msgs := consensus.FBFTLog.GetMessagesByTypeSeq(
+		msgs := consensus.FBFTLog().GetMessagesByTypeSeq(
 			msg_pb.MessageType_COMMITTED, blockNum,
 		)
 		if len(msgs) != 1 {
@@ -482,7 +482,7 @@ func (consensus *Consensus) getLastMileBlockIter(bnStart uint64, cb func(iter *L
 	}
 	return cb(&LastMileBlockIter{
 		blockCandidates: blocks,
-		fbftLog:         consensus.FBFTLog,
+		fbftLog:         consensus.fBFTLog,
 		verify:          consensus.BlockVerifier,
 		curIndex:        0,
 		logger:          consensus.getLogger(),
@@ -513,7 +513,7 @@ func (consensus *Consensus) getLastMileBlocksAndMsg(bnStart uint64) ([]*types.Bl
 		msgs   []*FBFTMessage
 	)
 	for blockNum := bnStart; ; blockNum++ {
-		blk, msg, err := consensus.FBFTLog.GetCommittedBlockAndMsgsFromNumber(blockNum, consensus.getLogger())
+		blk, msg, err := consensus.fBFTLog.GetCommittedBlockAndMsgsFromNumber(blockNum, consensus.getLogger())
 		if err != nil {
 			if err == errFBFTLogNotFound {
 				break
@@ -551,7 +551,7 @@ func (consensus *Consensus) preCommitAndPropose(blk *types.Block) error {
 		network.Bytes,
 		network.FBFTMsg
 	bareMinimumCommit := FBFTMsg.Payload
-	consensus.FBFTLog.AddVerifiedMessage(FBFTMsg)
+	consensus.fBFTLog.AddVerifiedMessage(FBFTMsg)
 
 	if err := consensus.verifyLastCommitSig(bareMinimumCommit, blk); err != nil {
 		return errors.Wrap(err, "[preCommitAndPropose] failed verifying last commit sig")
@@ -567,16 +567,16 @@ func (consensus *Consensus) preCommitAndPropose(blk *types.Block) error {
 				nodeconfig.NewGroupIDByShardID(nodeconfig.ShardID(consensus.ShardID)),
 			},
 			p2p.ConstructMessage(msgToSend)); err != nil {
-			consensus.getLogger().Warn().Err(err).Msg("[preCommitAndPropose] Cannot send committed message")
+			consensus.GetLogger().Warn().Err(err).Msg("[preCommitAndPropose] Cannot send committed message")
 		} else {
-			consensus.getLogger().Info().
+			consensus.GetLogger().Info().
 				Str("blockHash", blk.Hash().Hex()).
 				Uint64("blockNum", consensus.BlockNum()).
 				Hex("lastCommitSig", bareMinimumCommit).
 				Msg("[preCommitAndPropose] Sent Committed Message")
 		}
 
-		if _, err := consensus.Blockchain().InsertChain([]*types.Block{blk}, !consensus.FBFTLog.IsBlockVerified(blk.Hash())); err != nil {
+		if _, err := consensus.Blockchain().InsertChain([]*types.Block{blk}, !consensus.FBFTLog().IsBlockVerified(blk.Hash())); err != nil {
 			consensus.getLogger().Error().Err(err).Msg("[preCommitAndPropose] Failed to add block to chain")
 			return
 		}
@@ -661,7 +661,7 @@ func (consensus *Consensus) tryCatchup() error {
 
 func (consensus *Consensus) commitBlock(blk *types.Block, committedMsg *FBFTMessage) error {
 	if consensus.Blockchain().CurrentBlock().NumberU64() < blk.NumberU64() {
-		if _, err := consensus.Blockchain().InsertChain([]*types.Block{blk}, !consensus.FBFTLog.IsBlockVerified(blk.Hash())); err != nil {
+		if _, err := consensus.Blockchain().InsertChain([]*types.Block{blk}, !consensus.fBFTLog.IsBlockVerified(blk.Hash())); err != nil {
 			consensus.getLogger().Error().Err(err).Msg("[commitBlock] Failed to add block to chain")
 			return err
 		}
@@ -785,7 +785,7 @@ func (consensus *Consensus) setupForNewConsensus(blk *types.Block, committedMsg
 	if blk.IsLastBlockInEpoch() {
 		consensus.setMode(consensus.updateConsensusInformation())
 	}
-	consensus.FBFTLog.PruneCacheBeforeBlock(blk.NumberU64())
+	consensus.fBFTLog.PruneCacheBeforeBlock(blk.NumberU64())
 	consensus.resetState()
 }
 
@@ -920,19 +920,12 @@ func (consensus *Consensus) ValidateVdfAndProof(headerObj *block.Header) bool {
 func (consensus *Consensus) DeleteBlocksLessThan(number uint64) {
 	consensus.mutex.Lock()
 	defer consensus.mutex.Unlock()
-	consensus.FBFTLog.deleteBlocksLessThan(number)
+	consensus.fBFTLog.deleteBlocksLessThan(number)
 }
 
 // DeleteMessagesLessThan deletes messages less than given block number.
 func (consensus *Consensus) DeleteMessagesLessThan(number uint64) {
 	consensus.mutex.Lock()
 	defer consensus.mutex.Unlock()
-	consensus.FBFTLog.deleteMessagesLessThan(number)
-}
-
-// DeleteBlockByNumber deletes block by given block number.
-func (consensus *Consensus) DeleteBlockByNumber(number uint64) {
-	consensus.mutex.Lock()
-	defer consensus.mutex.Unlock()
-	consensus.FBFTLog.deleteBlockByNumber(number)
+	consensus.fBFTLog.deleteMessagesLessThan(number)
 }
diff --git a/consensus/double_sign.go b/consensus/double_sign.go
index b9bf818cbd..3a8d559fd6 100644
--- a/consensus/double_sign.go
+++ b/consensus/double_sign.go
@@ -22,7 +22,7 @@ func (consensus *Consensus) checkDoubleSign(recvMsg *FBFTMessage) bool {
 			); alreadyCastBallot != nil {
 				for _, pubKey1 := range alreadyCastBallot.SignerPubKeys {
 					if bytes.Compare(pubKey2.Bytes[:], pubKey1[:]) == 0 {
-						for _, blk := range consensus.FBFTLog.GetBlocksByNumber(recvMsg.BlockNum) {
+						for _, blk := range consensus.fBFTLog.GetBlocksByNumber(recvMsg.BlockNum) {
 							firstSignedHeader := blk.Header()
 							areHeightsEqual := firstSignedHeader.Number().Uint64() == recvMsg.BlockNum
 							areViewIDsEqual := firstSignedHeader.ViewID().Uint64() == recvMsg.ViewID
@@ -138,8 +138,8 @@ func (consensus *Consensus) couldThisBeADoubleSigner(
 	recvMsg *FBFTMessage,
 ) bool {
 	num, hash := consensus.BlockNum(), recvMsg.BlockHash
-	suspicious := !consensus.FBFTLog.HasMatchingAnnounce(num, hash) ||
-		!consensus.FBFTLog.HasMatchingPrepared(num, hash)
+	suspicious := !consensus.fBFTLog.HasMatchingAnnounce(num, hash) ||
+		!consensus.fBFTLog.HasMatchingPrepared(num, hash)
 	if suspicious {
 		consensus.getLogger().Debug().
 			Str("message", recvMsg.String()).
diff --git a/consensus/fbft_log.go b/consensus/fbft_log.go
index 5a4fe21889..982aecab75 100644
--- a/consensus/fbft_log.go
+++ b/consensus/fbft_log.go
@@ -3,6 +3,7 @@ package consensus
 import (
 	"encoding/binary"
 	"fmt"
+	"sync"
 
 	"github.com/ethereum/go-ethereum/common"
 	bls_core "github.com/harmony-one/bls/ffi/go/bls"
@@ -97,6 +98,16 @@ func (m *FBFTMessage) id() fbftMsgID {
 	return id
 }
 
+type FBFT interface {
+	GetMessagesByTypeSeq(typ msg_pb.MessageType, blockNum uint64) []*FBFTMessage
+	IsBlockVerified(hash common.Hash) bool
+	DeleteBlockByNumber(number uint64)
+	GetBlockByHash(hash common.Hash) *types.Block
+	AddVerifiedMessage(msg *FBFTMessage)
+	AddBlock(block *types.Block)
+	GetMessagesByTypeSeqHash(typ msg_pb.MessageType, blockNum uint64, blockHash common.Hash) []*FBFTMessage
+}
+
 // FBFTLog represents the log stored by a node during FBFT process
 type FBFTLog struct {
 	blocks         map[common.Hash]*types.Block // store blocks received in FBFT
@@ -157,7 +168,7 @@ func (log *FBFTLog) deleteBlocksLessThan(number uint64) {
 }
 
 // DeleteBlockByNumber deletes block of specific number
-func (log *FBFTLog) deleteBlockByNumber(number uint64) {
+func (log *FBFTLog) DeleteBlockByNumber(number uint64) {
 	for h, block := range log.blocks {
 		if block.NumberU64() == number {
 			delete(log.blocks, h)
@@ -360,3 +371,50 @@ func (log *FBFTLog) PruneCacheBeforeBlock(bn uint64) {
 	log.deleteBlocksLessThan(bn - 1)
 	log.deleteMessagesLessThan(bn - 1)
 }
+
+type threadsafeFBFTLog struct {
+	log *FBFTLog
+	mu  *sync.RWMutex
+}
+
+func (t threadsafeFBFTLog) GetMessagesByTypeSeq(typ msg_pb.MessageType, blockNum uint64) []*FBFTMessage {
+	t.mu.RLock()
+	defer t.mu.RUnlock()
+	return t.log.GetMessagesByTypeSeq(typ, blockNum)
+}
+
+func (t threadsafeFBFTLog) IsBlockVerified(hash common.Hash) bool {
+	t.mu.RLock()
+	defer t.mu.RUnlock()
+	return t.log.IsBlockVerified(hash)
+}
+
+func (t threadsafeFBFTLog) DeleteBlockByNumber(number uint64) {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	t.log.DeleteBlockByNumber(number)
+}
+
+func (t threadsafeFBFTLog) GetBlockByHash(hash common.Hash) *types.Block {
+	t.mu.RLock()
+	defer t.mu.RUnlock()
+	return t.log.GetBlockByHash(hash)
+}
+
+func (t threadsafeFBFTLog) AddVerifiedMessage(msg *FBFTMessage) {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	t.log.AddVerifiedMessage(msg)
+}
+
+func (t threadsafeFBFTLog) AddBlock(block *types.Block) {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	t.log.AddBlock(block)
+}
+
+func (t threadsafeFBFTLog) GetMessagesByTypeSeqHash(typ msg_pb.MessageType, blockNum uint64, blockHash common.Hash) []*FBFTMessage {
+	t.mu.RLock()
+	defer t.mu.RUnlock()
+	return t.log.GetMessagesByTypeSeqHash(typ, blockNum, blockHash)
+}
diff --git a/consensus/leader.go b/consensus/leader.go
index 1b10c96086..82ba3069bb 100644
--- a/consensus/leader.go
+++ b/consensus/leader.go
@@ -44,13 +44,13 @@ func (consensus *Consensus) announce(block *types.Block) {
 	}
 	msgToSend, FPBTMsg := networkMessage.Bytes, networkMessage.FBFTMsg
 
-	consensus.FBFTLog.AddVerifiedMessage(FPBTMsg)
+	consensus.fBFTLog.AddVerifiedMessage(FPBTMsg)
 	consensus.getLogger().Debug().
 		Str("MsgBlockHash", FPBTMsg.BlockHash.Hex()).
 		Uint64("MsgViewID", FPBTMsg.ViewID).
 		Uint64("MsgBlockNum", FPBTMsg.BlockNum).
 		Msg("[Announce] Added Announce message in FPBT")
-	consensus.FBFTLog.AddBlock(block)
+	consensus.fBFTLog.AddBlock(block)
 
 	// Leader sign the block hash itself
 	for i, key := range consensus.priKey {
@@ -94,7 +94,7 @@ func (consensus *Consensus) announce(block *types.Block) {
 
 func (consensus *Consensus) onPrepare(recvMsg *FBFTMessage) {
 	// TODO(audit): make FBFT lookup using map instead of looping through all items.
-	if !consensus.FBFTLog.HasMatchingViewAnnounce(
+	if !consensus.fBFTLog.HasMatchingViewAnnounce(
 		consensus.getBlockNum(), consensus.getCurBlockViewID(), recvMsg.BlockHash,
 	) {
 		consensus.getLogger().Debug().
@@ -226,7 +226,7 @@ func (consensus *Consensus) onCommit(recvMsg *FBFTMessage) {
 	}
 
 	// Must have the corresponding block to verify commit signature.
-	blockObj := consensus.FBFTLog.GetBlockByHash(recvMsg.BlockHash)
+	blockObj := consensus.fBFTLog.GetBlockByHash(recvMsg.BlockHash)
 	if blockObj == nil {
 		consensus.getLogger().Info().
 			Uint64("blockNum", recvMsg.BlockNum).
@@ -295,7 +295,7 @@ func (consensus *Consensus) onCommit(recvMsg *FBFTMessage) {
 
 	if !quorumWasMet && quorumIsMet {
 		logger.Info().Msg("[OnCommit] 2/3 Enough commits received")
-		consensus.FBFTLog.MarkBlockVerified(blockObj)
+		consensus.fBFTLog.MarkBlockVerified(blockObj)
 
 		if !blockObj.IsLastBlockInEpoch() {
 			// only do early commit if it's not epoch block to avoid problems
diff --git a/consensus/threshold.go b/consensus/threshold.go
index 11e65709e6..e611eaedcd 100644
--- a/consensus/threshold.go
+++ b/consensus/threshold.go
@@ -36,7 +36,7 @@ func (consensus *Consensus) didReachPrepareQuorum() error {
 		networkMessage.OptionalAggregateSignature
 
 	consensus.aggregatedPrepareSig = aggSig
-	consensus.FBFTLog.AddVerifiedMessage(FBFTMsg)
+	consensus.fBFTLog.AddVerifiedMessage(FBFTMsg)
 	// Leader add commit phase signature
 	var blockObj types.Block
 	if err := rlp.DecodeBytes(consensus.block, &blockObj); err != nil {
diff --git a/consensus/validator.go b/consensus/validator.go
index c67765cc8a..ee30d8c006 100644
--- a/consensus/validator.go
+++ b/consensus/validator.go
@@ -37,7 +37,7 @@ func (consensus *Consensus) onAnnounce(msg *msg_pb.Message) {
 		Uint64("MsgViewID", recvMsg.ViewID).
 		Uint64("MsgBlockNum", recvMsg.BlockNum).
 		Msg("[OnAnnounce] Announce message Added")
-	consensus.FBFTLog.AddVerifiedMessage(recvMsg)
+	consensus.fBFTLog.AddVerifiedMessage(recvMsg)
 	consensus.blockHash = recvMsg.BlockHash
 	// we have already added message and block, skip check viewID
 	// and send prepare message if is in ViewChanging mode
@@ -77,10 +77,10 @@ func (consensus *Consensus) ValidateNewBlock(recvMsg *FBFTMessage) (*types.Block
 	return consensus.validateNewBlock(recvMsg)
 }
 func (consensus *Consensus) validateNewBlock(recvMsg *FBFTMessage) (*types.Block, error) {
-	if consensus.FBFTLog.IsBlockVerified(recvMsg.BlockHash) {
+	if consensus.fBFTLog.IsBlockVerified(recvMsg.BlockHash) {
 		var blockObj *types.Block
 
-		blockObj = consensus.FBFTLog.GetBlockByHash(recvMsg.BlockHash)
+		blockObj = consensus.fBFTLog.GetBlockByHash(recvMsg.BlockHash)
 		if blockObj == nil {
 			var blockObj2 types.Block
 			if err := rlp.DecodeBytes(recvMsg.Block, &blockObj2); err != nil {
@@ -106,7 +106,7 @@ func (consensus *Consensus) validateNewBlock(recvMsg *FBFTMessage) (*types.Block
 		return nil, errors.New("Failed parsing new block")
 	}
 
-	consensus.FBFTLog.AddBlock(&blockObj)
+	consensus.fBFTLog.AddBlock(&blockObj)
 
 	// let this handle it own logs
 	if !consensus.newBlockSanityChecks(&blockObj, recvMsg) {
@@ -118,7 +118,7 @@ func (consensus *Consensus) validateNewBlock(recvMsg *FBFTMessage) (*types.Block
 	copy(blockPayload[:], recvMsg.Block[:])
 	consensus.block = blockPayload
 	recvMsg.Block = []byte{} // save memory space
-	consensus.FBFTLog.AddVerifiedMessage(recvMsg)
+	consensus.fBFTLog.AddVerifiedMessage(recvMsg)
 	consensus.getLogger().Debug().
 		Uint64("MsgViewID", recvMsg.ViewID).
 		Uint64("MsgBlockNum", recvMsg.BlockNum).
@@ -272,7 +272,7 @@ func (consensus *Consensus) onPrepared(recvMsg *FBFTMessage) {
 		curBlockNum := consensus.BlockNum()
 		consensus.mutex.Lock()
 		defer consensus.mutex.Unlock()
-		for _, committedMsg := range consensus.FBFTLog.GetNotVerifiedCommittedMessages(blockObj.NumberU64(), blockObj.Header().ViewID().Uint64(), blockObj.Hash()) {
+		for _, committedMsg := range consensus.fBFTLog.GetNotVerifiedCommittedMessages(blockObj.NumberU64(), blockObj.Header().ViewID().Uint64(), blockObj.Hash()) {
 			if committedMsg != nil {
 				consensus.onCommitted(committedMsg)
 			}
@@ -309,10 +309,10 @@ func (consensus *Consensus) onCommitted(recvMsg *FBFTMessage) {
 	}
 
 	// Optimistically add committedMessage in case of receiving committed before prepared
-	consensus.FBFTLog.AddNotVerifiedMessage(recvMsg)
+	consensus.fBFTLog.AddNotVerifiedMessage(recvMsg)
 
 	// Must have the corresponding block to verify committed message.
-	blockObj := consensus.FBFTLog.GetBlockByHash(recvMsg.BlockHash)
+	blockObj := consensus.fBFTLog.GetBlockByHash(recvMsg.BlockHash)
 	if blockObj == nil {
 		consensus.getLogger().Info().
 			Uint64("blockNum", recvMsg.BlockNum).
@@ -345,7 +345,7 @@ func (consensus *Consensus) onCommitted(recvMsg *FBFTMessage) {
 		consensus.getLogger().Error().Err(err).Msg("[OnCommitted] readSignatureBitmapPayload failed")
 		return
 	}
-	consensus.FBFTLog.AddVerifiedMessage(recvMsg)
+	consensus.fBFTLog.AddVerifiedMessage(recvMsg)
 	consensus.aggregatedCommitSig = aggSig
 	consensus.commitBitmap = mask
 
diff --git a/consensus/view_change.go b/consensus/view_change.go
index 151074817a..3927714e9a 100644
--- a/consensus/view_change.go
+++ b/consensus/view_change.go
@@ -274,7 +274,7 @@ func (consensus *Consensus) startViewChange() {
 
 	// init my own payload
 	if err := consensus.vc.InitPayload(
-		consensus.FBFTLog,
+		consensus.fBFTLog,
 		nextViewID,
 		consensus.getBlockNum(),
 		consensus.priKey,
@@ -394,7 +394,7 @@ func (consensus *Consensus) onViewChange(recvMsg *FBFTMessage) {
 	consensus.vc.AddViewIDKeyIfNotExist(recvMsg.ViewID, members)
 
 	// do it once only per viewID/Leader
-	if err := consensus.vc.InitPayload(consensus.FBFTLog,
+	if err := consensus.vc.InitPayload(consensus.fBFTLog,
 		recvMsg.ViewID,
 		recvMsg.BlockNum,
 		consensus.priKey,
@@ -403,7 +403,7 @@ func (consensus *Consensus) onViewChange(recvMsg *FBFTMessage) {
 		return
 	}
 
-	err = consensus.vc.ProcessViewChangeMsg(consensus.FBFTLog, consensus.Decider, recvMsg)
+	err = consensus.vc.ProcessViewChangeMsg(consensus.fBFTLog, consensus.Decider, recvMsg)
 	if err != nil {
 		consensus.getLogger().Error().Err(err).
 			Uint64("viewID", recvMsg.ViewID).
@@ -517,10 +517,10 @@ func (consensus *Consensus) onNewView(recvMsg *FBFTMessage) {
 		copy(preparedMsg.Payload[:], recvMsg.Payload[32:])
 
 		preparedMsg.SenderPubkeys = []*bls.PublicKeyWrapper{senderKey}
-		consensus.FBFTLog.AddVerifiedMessage(&preparedMsg)
+		consensus.fBFTLog.AddVerifiedMessage(&preparedMsg)
 
 		if preparedBlock != nil {
-			consensus.FBFTLog.AddBlock(preparedBlock)
+			consensus.fBFTLog.AddBlock(preparedBlock)
 		}
 	}
 
diff --git a/consensus/view_change_msg.go b/consensus/view_change_msg.go
index c241450306..fdb3f3afe2 100644
--- a/consensus/view_change_msg.go
+++ b/consensus/view_change_msg.go
@@ -32,14 +32,14 @@ func (consensus *Consensus) constructViewChangeMessage(priKey *bls.PrivateKeyWra
 		},
 	}
 
-	preparedMsgs := consensus.FBFTLog.GetMessagesByTypeSeq(
+	preparedMsgs := consensus.fBFTLog.GetMessagesByTypeSeq(
 		msg_pb.MessageType_PREPARED, consensus.getBlockNum(),
 	)
-	preparedMsg := consensus.FBFTLog.FindMessageByMaxViewID(preparedMsgs)
+	preparedMsg := consensus.fBFTLog.FindMessageByMaxViewID(preparedMsgs)
 
 	var encodedBlock []byte
 	if preparedMsg != nil {
-		block := consensus.FBFTLog.GetBlockByHash(preparedMsg.BlockHash)
+		block := consensus.fBFTLog.GetBlockByHash(preparedMsg.BlockHash)
 		consensus.getLogger().Info().
 			Interface("Block", block).
 			Interface("preparedMsg", preparedMsg).
@@ -115,7 +115,7 @@ func (consensus *Consensus) constructNewViewMessage(viewID uint64, priKey *bls.P
 	}
 
 	vcMsg := message.GetViewchange()
-	vcMsg.Payload, vcMsg.PreparedBlock = consensus.vc.GetPreparedBlock(consensus.FBFTLog)
+	vcMsg.Payload, vcMsg.PreparedBlock = consensus.vc.GetPreparedBlock(consensus.fBFTLog)
 	vcMsg.M2Aggsigs, vcMsg.M2Bitmap = consensus.vc.GetM2Bitmap(viewID)
 	vcMsg.M3Aggsigs, vcMsg.M3Bitmap = consensus.vc.GetM3Bitmap(viewID)
 	if vcMsg.M3Bitmap == nil || vcMsg.M3Aggsigs == nil {
diff --git a/node/node_explorer.go b/node/node_explorer.go
index 0dd7319761..fbb5b88985 100644
--- a/node/node_explorer.go
+++ b/node/node_explorer.go
@@ -58,13 +58,13 @@ func (node *Node) explorerMessageHandler(ctx context.Context, msg *msg_pb.Messag
 			return nil
 		}
 
-		block := node.Consensus.FBFTLog.GetBlockByHash(recvMsg.BlockHash)
+		block := node.Consensus.FBFTLog().GetBlockByHash(recvMsg.BlockHash)
 
 		if block == nil {
 			utils.Logger().Info().
 				Uint64("msgBlock", recvMsg.BlockNum).
 				Msg("[Explorer] Haven't received the block before the committed msg")
-			node.Consensus.FBFTLog.AddVerifiedMessage(recvMsg)
+			node.Consensus.FBFTLog().AddVerifiedMessage(recvMsg)
 			return errBlockBeforeCommit
 		}
 
@@ -94,9 +94,9 @@ func (node *Node) explorerMessageHandler(ctx context.Context, msg *msg_pb.Messag
 			return err
 		}
 		// Add the block into FBFT log.
-		node.Consensus.FBFTLog.AddBlock(blockObj)
+		node.Consensus.FBFTLog().AddBlock(blockObj)
 		// Try to search for MessageType_COMMITTED message from pbft log.
-		msgs := node.Consensus.FBFTLog.GetMessagesByTypeSeqHash(
+		msgs := node.Consensus.FBFTLog().GetMessagesByTypeSeqHash(
 			msg_pb.MessageType_COMMITTED,
 			blockObj.NumberU64(),
 			blockObj.Hash(),
@@ -148,7 +148,7 @@ func (node *Node) TraceLoopForExplorer() {
 // AddNewBlockForExplorer add new block for explorer.
 func (node *Node) AddNewBlockForExplorer(block *types.Block) {
 	if node.HarmonyConfig.General.RunElasticMode && node.HarmonyConfig.TiKV.Role == tikv.RoleReader {
-		node.Consensus.DeleteBlockByNumber(block.NumberU64())
+		node.Consensus.FBFTLog().DeleteBlockByNumber(block.NumberU64())
 		return
 	}
 
@@ -159,7 +159,7 @@ func (node *Node) AddNewBlockForExplorer(block *types.Block) {
 			node.Consensus.UpdateConsensusInformation()
 		}
 		// Clean up the blocks to avoid OOM.
-		node.Consensus.DeleteBlockByNumber(block.NumberU64())
+		node.Consensus.FBFTLog().DeleteBlockByNumber(block.NumberU64())
 
 		// if in tikv mode, only master writer node need dump all explorer block
 		if !node.HarmonyConfig.General.RunElasticMode || node.Blockchain().IsTikvWriterMaster() {