diff --git a/pkg/datasource/sql/undo/base/undo.go b/pkg/datasource/sql/undo/base/undo.go
index c38bf4af2..8f358ebce 100644
--- a/pkg/datasource/sql/undo/base/undo.go
+++ b/pkg/datasource/sql/undo/base/undo.go
@@ -102,9 +102,26 @@ func (m *BaseUndoLogManager) BatchDeleteUndoLog(xid []string, branchID []int64,
 	return nil
 }
 
-// FlushUndoLog
+// FlushUndoLog flush undo log
 func (m *BaseUndoLogManager) FlushUndoLog(txCtx *types.TransactionContext, tx driver.Conn) error {
-	return nil
+	if !txCtx.HasUndoLog() {
+		return nil
+	}
+	logs := []undo.SQLUndoLog{
+		{
+			SQLType:   types.SQLTypeInsert,
+			TableName: constant.UndoLogTableName,
+			Images:    *txCtx.RoundImages,
+		},
+	}
+	branchUndoLogs := []undo.BranchUndoLog{
+		{
+			Xid:      txCtx.XaID,
+			BranchID: strconv.FormatUint(txCtx.BranchID, 10),
+			Logs:     logs,
+		},
+	}
+	return m.InsertUndoLog(branchUndoLogs, tx)
 }
 
 // RunUndo
diff --git a/pkg/datasource/sql/undo/undo.go b/pkg/datasource/sql/undo/undo.go
index 7abbca2da..376f3c1fd 100644
--- a/pkg/datasource/sql/undo/undo.go
+++ b/pkg/datasource/sql/undo/undo.go
@@ -99,11 +99,11 @@ func GetUndoLogManager(d types.DBType) (UndoLogManager, error) {
 // BranchUndoLog
 type BranchUndoLog struct {
 	// Xid
-	Xid string
+	Xid string `json:"xid"`
 	// BranchID
-	BranchID string
+	BranchID string `json:"branchId"`
 	// Logs
-	Logs []SQLUndoLog
+	Logs []SQLUndoLog `json:"sqlUndoLogs"`
 }
 
 // Marshal
@@ -113,9 +113,9 @@ func (b *BranchUndoLog) Marshal() []byte {
 
 // SQLUndoLog
 type SQLUndoLog struct {
-	SQLType   types.SQLType
-	TableName string
-	Images    types.RoundRecordImage
+	SQLType   types.SQLType          `json:"sqlType"`
+	TableName string                 `json:"tableName"`
+	Images    types.RoundRecordImage `json:"images"`
 }
 
 // UndoLogParser