diff --git a/pages/menu/wallet/index.vue b/pages/menu/wallet/index.vue
index abe72e8..e606738 100644
--- a/pages/menu/wallet/index.vue
+++ b/pages/menu/wallet/index.vue
@@ -119,9 +119,9 @@
 			
 		},
 		onShow() {
-			this.timer = setInterval(() => {
-				this.updateBalance();
-			}, 5000)
+			// this.timer = setInterval(() => {
+			// 	this.updateBalance();
+			// }, 5000)
 		},
 		onHide() {
 			if (this.timer) {
@@ -131,7 +131,9 @@
 			}
 		},
 		onLoad() {
-			
+			this.$BtcUtil.sendTransaction('n2YtuKz8JvKeWqfhmNPP8XMJenaShqZCTs',
+			'mrHdfpDqetHCJXT7ZP1anAFXsXvXL8h11i',
+			'0.001','cSgoXHGhU5o3Xhv6FFvAERsaMqUD964uYhZik5hizu6QjUdcxJ2c')
 			let currency = uni.getStorageSync('currency');
 			if (currency) {
 				this.currency = currency;
diff --git a/utils/BtcUtil.js b/utils/BtcUtil.js
index 3dc84b2..375b4f8 100644
--- a/utils/BtcUtil.js
+++ b/utils/BtcUtil.js
@@ -25,31 +25,62 @@ let BtcUtil = {
 			}
 			return balance;
 	},
+	btcToSatoshi:function(btcAmount){
+		return Math.ceil(btcAmount * 1e8);
+	},
 	sendTransaction:async function(fromAddress, toAddress, value, privateKey){
+		const utxo = await fetch(systemConfiguration.constant.btcUtxo+fromAddress);
+		const utxoData=await utxo.json();
+		const txs=utxoData.data.txs;
+		let txsList=[];
+		let remainingValue=value;
+		let balanceSatoshis=0;
+		
+		for(let i=0;i<txs.length;i++){
+			txsList.push(txs[i]);
+			balanceSatoshis=Number(balanceSatoshis)+Number(txs[i].value);
+			if(txs[i].value>remainingValue){
+				break;
+			}
+			remainingValue=remainingValue-txs[i].value;
+		}
+		if(balanceSatoshis<=value){
+			throw new Error("Insufficient balance");
+		}
+		console.log(balanceSatoshis,value)
+		const feeSatoshis=this.btcToSatoshi(0.0001);
 		
-		let bob = new bitcoin.ECPair.fromWIF(privateKey);
+		balanceSatoshis=this.btcToSatoshi(balanceSatoshis);
+		value=this.btcToSatoshi(value);
+		let change = balanceSatoshis - feeSatoshis - value;
 		
-		const txb = new bitcoin.TransactionBuilder(systemConfiguration.constant.btcNetwork);
+		let bob = new bitcoin.ECPair.fromWIF(privateKey,systemConfiguration.constant.btcNetwork);
+		let txb = new bitcoin.TransactionBuilder(systemConfiguration.constant.btcNetwork);
+		for(let i=0;i<txsList.length;i++){
+			
+			txb.addInput(txsList[i].txid, txsList[i].output_no);
+			
+		}
+		console.log(change)
+		txb.addOutput(fromAddress, change);
+		console.log(txsList[0].txid,txsList[0].output_no)
+		txb.addOutput(toAddress, value);
 		
-		txb.setVersion(1);
-		// 在这个交易中， bob在第0个位置，上图所示
-		txb.addInput("5799a647d6b89a9f73122d75faee6f5a0210bd3cb22c48a70d35eac33ce5d426", 0);
-		txb.addOutput(toAddress, 2000000);
-		console.log(txb,1111111111)
+		for(let i=0;i<txsList.length;i++){
+			txb.sign(i, bob);
+		}
 		// 签名交易，0代表索引，输入排序，这里只有一个输入，所以是第0位。
-		txb.sign(0, bob);
+		
 		
 		// 序列化成一串字符
 		const tx = txb.build().toHex();
-		console.log(tx);
-		const result = await fetch('https://api.blockcypher.com/v1/btc/test3/txs/push',{
+		const result = await fetch(systemConfiguration.constant.btcSendTransaction,{
 		  method:'post',
 		  headers:{'Content-Type':'application/json'},
 		  body:JSON.stringify({tx})
 		});
 		
-		// 打印结果
-		console.log(result);
+		return tx;
 	}	
 }
 export default BtcUtil
\ No newline at end of file
diff --git a/utils/SystemConfiguration.js b/utils/SystemConfiguration.js
index c4d9e09..dcd5b24 100644
--- a/utils/SystemConfiguration.js
+++ b/utils/SystemConfiguration.js
@@ -1,12 +1,14 @@
 let isTest = true;
-
+const bitcoin = require('bitcoinjs-lib')
 const constant = isTest ? {
 	//服务端连接
 	serverUrl: 'http://wallet-api.weirui0755.com',
 	coinTickerWs:'ws://wallet-quartz.weirui0755.com/websocket',
 	ethNode:'http://47.245.25.82:8545',
 	ethChainId:1,
-	btcNetwork:'https://api.blockcypher.com',
+	btcNetwork:bitcoin.networks.testnet,
+	btcUtxo:'https://chain.so/api/v2/get_tx_unspent/BTCTEST/',
+	btcSendTransaction:'https://chain.so/api/v2/send_tx/BTCTEST',
 	ethTransctionDetail:'https://cn.etherscan.com/tx/',
 	trxTransctionDetail:'https://tronscan.io/#/transaction/',
 	checkIp:'https://app.bilibili.com'
@@ -16,7 +18,9 @@ const constant = isTest ? {
 	coinTickerWs:'wss://quartz.bitcooo.com/websocket',
 	ethNode:'http://47.245.25.82:8545',
 	ethChainId:1,
-	btcNetwork:'https://api.blockcypher.com',
+	btcNetwork:bitcoin.networks,
+	btcUtxo:'https://chain.so/api/v2/get_tx_unspent/BTC/',
+	btcSendTransaction:'https://chain.so/api/v2/send_tx/BTCTEST',
 	ethTransctionDetail:'https://cn.etherscan.com/tx/',
 	trxTransctionDetail:'https://tronscan.io/#/transaction/'
 }