diff --git a/blockchain/types/tx_internal_data_serializer.go b/blockchain/types/tx_internal_data_serializer.go
index f5d813975..98b251cac 100644
--- a/blockchain/types/tx_internal_data_serializer.go
+++ b/blockchain/types/tx_internal_data_serializer.go
@@ -69,42 +69,13 @@ func (serializer *TxInternalDataSerializer) EncodeRLP(w io.Writer) error {
 func (serializer *TxInternalDataSerializer) DecodeRLP(s *rlp.Stream) error {
 	if err := s.Decode(&serializer.txType); err != nil {
 		// fallback to the original transaction decoding.
-		kind, _, err := s.Kind()
-		switch {
-		case err != nil:
+		txd := newEmptyTxInternalDataLegacy()
+		if err := s.Decode(txd); err != nil {
 			return err
-		case kind == rlp.List:
-			// It's a legacy transaction.
-			txd := newEmptyTxInternalDataLegacy()
-			if err := s.Decode(txd); err != nil {
-				return err
-			}
-			serializer.txType = TxTypeLegacyTransaction
-			serializer.tx = txd
-			return nil
-		default:
-			// It's an EIP-2718 typed TX envelope.
-			// First read the tx payload bytes into a temporary buffer.
-			ethType, err := s.ReadByte()
-			if err != nil {
-				return err
-			}
-
-			switch ethType {
-			case 1:
-				serializer.tx = new(TxInternalDataEthereumAccessList)
-			case 2:
-				serializer.tx = new(TxInternalDataEthereumDynamicFee)
-			case 3:
-				return errUndefinedTxType
-			case 4:
-				serializer.tx = new(TxInternalDataEthereumSetCode)
-			default:
-				return errUndefinedTxType
-			}
-
-			return s.Decode(serializer.tx)
 		}
+		serializer.txType = TxTypeLegacyTransaction
+		serializer.tx = txd
+		return nil
 	}
 
 	if serializer.txType == EthereumTxTypeEnvelope {
diff --git a/tests/block_test_util.go b/tests/block_test_util.go
index e23f0935b..128e7eefe 100644
--- a/tests/block_test_util.go
+++ b/tests/block_test_util.go
@@ -612,8 +612,49 @@ func (bb *btBlock) decodeTx() (types.Transactions, TestHeader, error) {
 
 	// Decode transactions
 	var txs types.Transactions
-	if err := s.Decode(&txs); err != nil {
-		return nil, TestHeader{}, fmt.Errorf("failed to decode transactions: %v", err)
+	if _, err := s.List(); err != nil {
+		return nil, TestHeader{}, fmt.Errorf("failed to enter outer list: %v", err)
+	}
+
+	// Self decode to convert to kaia's eth tx type
+	for {
+		var tx types.Transaction
+		kind, _, err := s.Kind()
+		if err == rlp.EOL {
+			break
+		} else if err != nil {
+			return nil, TestHeader{}, fmt.Errorf("failed to get RLP kind: %v", err)
+		}
+
+		txdata, _ := s.Raw()
+		ethTxDataInKaia := []byte{}
+		switch kind {
+		case rlp.List: // case of legacy
+			ethTxDataInKaia = txdata
+		case rlp.String: // case of envelope
+			var ethTypeIndex int
+			if txdata[0] < 0xb7 {
+				ethTypeIndex = 1
+			} else {
+				ethTypeIndex = int(txdata[0] - 0xb7 + 1)
+			}
+			switch txdata[ethTypeIndex] {
+			case 1, 2, 4: // eth transaction types whick kaia support
+				ethTxDataInKaia = append([]byte{byte(types.EthereumTxTypeEnvelope)}, txdata[ethTypeIndex:]...)
+			default:
+				ethTxDataInKaia = txdata
+			}
+		default:
+			return nil, TestHeader{}, fmt.Errorf("failed to get RLP kind: %v", err)
+		}
+
+		streamForTx := rlp.NewStream(bytes.NewReader(ethTxDataInKaia), 0)
+		if err := streamForTx.Decode(&tx); err == rlp.EOL {
+			break
+		} else if err != nil {
+			return nil, TestHeader{}, fmt.Errorf("failed to decode transaction: %v", err)
+		}
+		txs = append(txs, &tx)
 	}
 
 	return txs, header, nil