diff --git a/consensus/vbft/chain_store.go b/consensus/vbft/chain_store.go
index ae0204b8..0a2818d7 100644
--- a/consensus/vbft/chain_store.go
+++ b/consensus/vbft/chain_store.go
@@ -20,6 +20,7 @@ package vbft
 
 import (
 	"fmt"
+	"sync"
 
 	"github.com/ontio/ontology-eventbus/actor"
 	"github.com/polynetwork/poly/common"
@@ -36,6 +37,8 @@ type PendingBlock struct {
 	hasSubmitted bool
 }
 type ChainStore struct {
+	mu *sync.Mutex
+
 	db              *ledger.Ledger
 	chainedBlockNum uint32
 	pendingBlocks   map[uint32]*PendingBlock
@@ -50,6 +53,7 @@ func OpenBlockStore(db *ledger.Ledger, serverPid *actor.PID) (*ChainStore, error
 		pendingBlocks:   make(map[uint32]*PendingBlock),
 		pid:             serverPid,
 		needSubmitBlock: false,
+		mu:              new(sync.Mutex),
 	}
 	merkleRoot, err := db.GetStateMerkleRoot(chainstore.chainedBlockNum)
 	if err != nil {
@@ -74,10 +78,16 @@ func (self *ChainStore) close() {
 }
 
 func (self *ChainStore) GetChainedBlockNum() uint32 {
+	self.mu.Lock()
+	defer self.mu.Unlock()
+
 	return self.chainedBlockNum
 }
 
 func (self *ChainStore) getExecMerkleRoot(blkNum uint32) (common.Uint256, error) {
+	self.mu.Lock()
+	defer self.mu.Unlock()
+
 	if blk, present := self.pendingBlocks[blkNum]; blk != nil && present {
 		return blk.execResult.MerkleRoot, nil
 	}
@@ -92,6 +102,9 @@ func (self *ChainStore) getExecMerkleRoot(blkNum uint32) (common.Uint256, error)
 }
 
 func (self *ChainStore) getCrossStateRoot(blkNum uint32) (common.Uint256, error) {
+	self.mu.Lock()
+	defer self.mu.Unlock()
+
 	if blk, present := self.pendingBlocks[blkNum]; blk != nil && present {
 		return blk.execResult.CrossStatesRoot, nil
 	}
@@ -104,6 +117,9 @@ func (self *ChainStore) getCrossStateRoot(blkNum uint32) (common.Uint256, error)
 }
 
 func (self *ChainStore) getExecWriteSet(blkNum uint32) *overlaydb.MemDB {
+	self.mu.Lock()
+	defer self.mu.Unlock()
+
 	if blk, present := self.pendingBlocks[blkNum]; blk != nil && present {
 		return blk.execResult.WriteSet
 	}
@@ -111,6 +127,9 @@ func (self *ChainStore) getExecWriteSet(blkNum uint32) *overlaydb.MemDB {
 }
 
 func (self *ChainStore) ReloadFromLedger() {
+	self.mu.Lock()
+	defer self.mu.Unlock()
+
 	height := self.db.GetCurrentBlockHeight()
 	if height > self.chainedBlockNum {
 		// update chainstore height
@@ -128,6 +147,9 @@ func (self *ChainStore) ReloadFromLedger() {
 }
 
 func (self *ChainStore) AddBlock(block *Block) error {
+	self.mu.Lock()
+	defer self.mu.Unlock()
+
 	if block == nil {
 		return fmt.Errorf("try add nil block")
 	}
@@ -162,6 +184,9 @@ func (self *ChainStore) AddBlock(block *Block) error {
 }
 
 func (self *ChainStore) submitBlock(blkNum uint32) error {
+	self.mu.Lock()
+	defer self.mu.Unlock()
+
 	if blkNum == 0 {
 		return nil
 	}
@@ -179,6 +204,9 @@ func (self *ChainStore) submitBlock(blkNum uint32) error {
 }
 
 func (self *ChainStore) getBlock(blockNum uint32) (*Block, error) {
+	self.mu.Lock()
+	defer self.mu.Unlock()
+
 	if blk, present := self.pendingBlocks[blockNum]; present {
 		return blk.block, nil
 	}