diff --git a/src/main/java/com/muyu/common/Config.java b/src/main/java/com/muyu/common/Config.java
index af9cfe6..e700325 100644
--- a/src/main/java/com/muyu/common/Config.java
+++ b/src/main/java/com/muyu/common/Config.java
@@ -33,6 +33,16 @@ public class Config {
 	 */
 	public static boolean IS_CONNECT = false;
 
+	/**
+	 * 报文起始位
+	 */
+	public static final String MSG_START = "7E ";
+
+	/**
+	 * 报文结束位
+	 */
+	public static final String MSG_END = "7E";
+
 	/**
 	 * 连接消息VIN
 	 */
diff --git a/src/main/java/com/muyu/netty/operate/NettyClientMsg.java b/src/main/java/com/muyu/netty/operate/NettyClientMsg.java
index ee4e500..6b32952 100644
--- a/src/main/java/com/muyu/netty/operate/NettyClientMsg.java
+++ b/src/main/java/com/muyu/netty/operate/NettyClientMsg.java
@@ -2,6 +2,7 @@ package com.muyu.netty.operate;
 
 
 import com.muyu.common.Config;
+import com.muyu.utils.CalculateCheckDigit;
 import com.muyu.utils.ConversionUtil;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -22,8 +23,20 @@ public class NettyClientMsg {
      * @param msg
      */
     public static void sendMsg(String msg){
-        log.info("客户端发送消息：{}",msg);
-        Config.ctx.writeAndFlush(ConversionUtil.strToSixteen(msg) + Config.DATA_PACK_SEPARATOR);
+        log.info("发送消息：{}",msg);
+        //得到16进制报文
+        String sHex = ConversionUtil.strToSixteen(msg);
+        //计算校验和
+        String makeCheck = CalculateCheckDigit.makeCheck(sHex);
+        //拼接报文 - 起始位
+        StringBuilder sb = new StringBuilder(Config.MSG_START);
+        //拼接报文 - 数据位
+        sb.append(sHex);
+        //拼接报文 - 校验位
+        sb.append(makeCheck).append(" ");
+        //拼接报文 截止位
+        sb.append(Config.MSG_END);
+        Config.ctx.writeAndFlush(sb.toString() + Config.DATA_PACK_SEPARATOR);
     }
 
     /**
diff --git a/src/main/java/com/muyu/utils/CalculateCheckDigit.java b/src/main/java/com/muyu/utils/CalculateCheckDigit.java
new file mode 100644
index 0000000..dce7f70
--- /dev/null
+++ b/src/main/java/com/muyu/utils/CalculateCheckDigit.java
@@ -0,0 +1,58 @@
+package com.muyu.utils;
+
+/**
+ * 校验位计算
+ */
+public class CalculateCheckDigit {
+
+    /**
+     * 输入十六进制，输出两位校验位
+     * */
+    public static void main(String args[]) {
+        // 输入十六进制
+        String sHex = "01 F1 00 04 03 06 01 B0";
+        // 去掉中间空格
+        sHex = sHex.replace(" ", "");
+        // 计算并获取校验位
+        String result = makeCheckSum(sHex);
+        // 输出两位校验位 结果是B0
+        System.out.println(result);
+    }
+
+    /**
+     * 不去空格
+     * @param sHex
+     * @return
+     */
+    public static String makeCheck(String sHex){
+        return makeCheckSum(sHex.replace(" ", ""));
+    }
+
+    /**
+     * 计算校验位 ，返回十六进制校验位
+     * */
+    private static String makeCheckSum(String data) {
+        int dSum = 0;
+        int length = data.length();
+        int index = 0;
+        // 遍历十六进制，并计算总和
+        while (index < length) {
+            // 截取2位字符
+            String s = data.substring(index, index + 2);
+            // 十六进制转成十进制 , 并计算十进制的总和
+            dSum += Integer.parseInt(s, 16);
+            index = index + 2;
+        }
+
+        // 用256取余，十六进制最大是FF，FF的十进制是255
+        int mod = dSum % 256;
+        // 余数转成十六进制
+        String checkSumHex = Integer.toHexString(mod);
+        length = checkSumHex.length();
+        if (length < 2) {
+            // 校验位不足两位的，在前面补0
+            checkSumHex = "0" + checkSumHex;
+        }
+        return checkSumHex;
+    }
+}