diff --git a/20_DecodeTx/DecodeTx.js b/20_DecodeTx/DecodeTx.js
index 6e5fe36..6bd4da1 100644
--- a/20_DecodeTx/DecodeTx.js
+++ b/20_DecodeTx/DecodeTx.js
@@ -25,16 +25,21 @@ function handleBigInt(key, value) {
     return value;
 }
 
+// 处理 USDT decimals
+function format_usdt(amount_int) {
+  return Number(amount_int) / 10 ** 6;
+}
+
 let j = 0
 provider.on('pending', async (txHash) => {
     if (txHash) {
         const tx = await provider.getTransaction(txHash)
         j++
-        if (tx !== null && tx.data.indexOf(selector) !== -1) {
+        if (tx !== null && tx.data.indexOf(selector) !== -1 && tx.to == "0xdAC17F958D2ee523a2206206994597C13D831ec7") {
             console.log(`[${(new Date).toLocaleTimeString()}]监听到第${j + 1}个pending交易:${txHash}`)
             console.log(`打印解码交易详情:${JSON.stringify(iface.parseTransaction(tx), handleBigInt, 2)}`)
             console.log(`转账目标地址:${iface.parseTransaction(tx).args[0]}`)
-            console.log(`转账金额:${ethers.formatEther(iface.parseTransaction(tx).args[1])}`)
+            console.log(`转账金额:${format_usdt(iface.parseTransaction(tx).args[1])}`)
             provider.removeListener('pending', this)
         }
     }