diff --git a/core/btc/account_test.go b/core/btc/account_test.go
index eb50a45..f11700b 100644
--- a/core/btc/account_test.go
+++ b/core/btc/account_test.go
@@ -351,6 +351,10 @@ func TestAccount_SignPsbt(t *testing.T) {
 	txn, err := acc.SignPsbt(psbtHex)
 	require.NoError(t, err)
 	require.True(t, txn.Packet.IsComplete())
+
+	res, err := txn.PsbtHexString()
+	require.NoError(t, err)
+	t.Log("signed result: ", res.Value)
 }
 
 func TestChain_PushPsbt(t *testing.T) {
diff --git a/core/btc/transaction_psbt.go b/core/btc/transaction_psbt.go
index 14d9bac..0085b00 100644
--- a/core/btc/transaction_psbt.go
+++ b/core/btc/transaction_psbt.go
@@ -1,6 +1,9 @@
 package btc
 
 import (
+	"bytes"
+	"encoding/hex"
+
 	"github.com/btcsuite/btcd/btcutil/psbt"
 	"github.com/coming-chat/wallet-SDK/core/base"
 )
@@ -44,6 +47,19 @@ func (t *SignedPsbtTransaction) HexString() (res *base.OptionalString, err error
 	return nil, base.ErrUnsupportedFunction
 }
 
+func (t *SignedPsbtTransaction) PsbtHexString() (*base.OptionalString, error) {
+	packet := t.Packet
+	if err := EnsurePsbtFinalize(&packet); err != nil {
+		return nil, err
+	}
+	var buff bytes.Buffer
+	if err := packet.Serialize(&buff); err != nil {
+		return nil, err
+	}
+	hexString := hex.EncodeToString(buff.Bytes())
+	return &base.OptionalString{Value: hexString}, nil
+}
+
 func (t *SignedPsbtTransaction) PublishWithChain(c *Chain) (hashs *base.OptionalString, err error) {
 	defer base.CatchPanicAndMapToBasicError(&err)