diff --git a/audit_log/audit_log.go b/audit_log/audit_log.go
index 1da92d0..9f6aeb9 100644
--- a/audit_log/audit_log.go
+++ b/audit_log/audit_log.go
@@ -17,10 +17,10 @@ func New(binlogSyncer *syncer.BinlogSynchronizer, txInfoSyncer *syncer.TxInfoSyn
 	return &AuditLogger{binlogSyncer: binlogSyncer, txInfoSyncer: txInfoSyncer}
 }
 
-func (a *AuditLogger) Sync(handler Handler) {
-	go a.txInfoSyncer.HandleAuditLog(handler.OnAuditLog)
-	a.binlogSyncer.Sync()
-	a.txInfoSyncer.Sync()
+func (log *AuditLogger) Sync(handler Handler) {
+	go log.txInfoSyncer.HandleAuditLog(handler.OnAuditLog)
+	log.binlogSyncer.Sync()
+	log.txInfoSyncer.Sync()
 }
 
 func Init(path string) {
diff --git a/audit_log/handler.go b/audit_log/handler.go
index a8a40a5..8dd65f3 100644
--- a/audit_log/handler.go
+++ b/audit_log/handler.go
@@ -6,18 +6,18 @@ import (
 )
 
 type Handler interface {
-	OnAuditLog(auditLog types.AuditLog) error
+	OnAuditLog(auditLog *types.AuditLog) error
 }
 
-type FunctionHandler func(auditLog types.AuditLog) error
+type FunctionHandler func(auditLog *types.AuditLog) error
 
-func (f FunctionHandler) OnAuditLog(auditLog types.AuditLog) error {
+func (f FunctionHandler) OnAuditLog(auditLog *types.AuditLog) error {
 	return f(auditLog)
 }
 
-type DummyAuditLogHandler func(auditLog types.AuditLog) error
+type DummyAuditLogHandler func(auditLog *types.AuditLog) error
 
-func (f DummyAuditLogHandler) OnAuditLog(auditLog types.AuditLog) error {
+func (f DummyAuditLogHandler) OnAuditLog(auditLog *types.AuditLog) error {
 	fmt.Printf("get audit log: %+v", auditLog)
 	return nil
 }
diff --git a/example/example.go b/example/example.go
index a11d6ca..c3e5f5b 100644
--- a/example/example.go
+++ b/example/example.go
@@ -15,8 +15,8 @@ import (
 func main() {
 	audit_log.Init("../config/config.toml")
 
-	audit_log.Run(audit_log.FunctionHandler(func(auditLog types.AuditLog) error {
-		fmt.Printf("get audit log: %+v\n", auditLog)
+	audit_log.Run(audit_log.FunctionHandler(func(auditLog *types.AuditLog) error {
+		fmt.Printf("get audit log: %+v\n", *auditLog)
 		return nil
 	}))
 
diff --git a/syncer/tx_syncer.go b/syncer/tx_syncer.go
index c972302..c0361ae 100644
--- a/syncer/tx_syncer.go
+++ b/syncer/tx_syncer.go
@@ -20,14 +20,14 @@ const (
 
 type TxInfoSynchronizer struct {
 	*broker.TxKafkaBroker
-	auditChan chan types.AuditLog
+	auditChan chan *types.AuditLog
 }
 
 func NewTxInfoSyncer(broker *broker.TxKafkaBroker) *TxInfoSynchronizer {
-	return &TxInfoSynchronizer{TxKafkaBroker: broker, auditChan: make(chan types.AuditLog, defaultAuditChanSize)}
+	return &TxInfoSynchronizer{TxKafkaBroker: broker, auditChan: make(chan *types.AuditLog, defaultAuditChanSize)}
 }
 
-func (s *TxInfoSynchronizer) HandleAuditLog(fn func(txEvent types.AuditLog) error) {
+func (s *TxInfoSynchronizer) HandleAuditLog(fn func(txEvent *types.AuditLog) error) {
 	for audit := range s.auditChan {
 		if err := fn(audit); err != nil {
 			logger.ErrorDetails(errors.Trace(err))
@@ -187,7 +187,7 @@ func (i *unprocessedInfos) Add(info types.ChTxInfo) {
 }
 
 func (i *unprocessedInfos) getToProcess() (
-	toProcessInfoEvents []types.AuditLog,
+	toProcessInfoEvents []*types.AuditLog,
 	toProcessInfo []types.ChTxInfo,
 	err error,
 ) {
diff --git a/types/binlog_event.go b/types/binlog_event.go
index a1634bb..846326d 100644
--- a/types/binlog_event.go
+++ b/types/binlog_event.go
@@ -14,8 +14,8 @@ type AuditLog struct {
 	BinlogEvents []ChBinlogEvent
 }
 
-func NewAuditLog(txInfo ChTxInfo, events []ChBinlogEvent) AuditLog {
-	txBinlogEvent := AuditLog{
+func NewAuditLog(txInfo ChTxInfo, events []ChBinlogEvent) *AuditLog {
+	txBinlogEvent := &AuditLog{
 		Time:         txInfo.Time,
 		Context:      txInfo.Context,
 		GTID:         txInfo.GTID,