diff --git a/viewshanghai-module-iot/viewshanghai-module-iot-gateway/src/main/java/com/viewshanghai/module/iot/gateway/codec/jt808/IotJt808DeviceMessageCodec.java b/viewshanghai-module-iot/viewshanghai-module-iot-gateway/src/main/java/com/viewshanghai/module/iot/gateway/codec/jt808/IotJt808DeviceMessageCodec.java
index 2c7c44d..761c67b 100644
--- a/viewshanghai-module-iot/viewshanghai-module-iot-gateway/src/main/java/com/viewshanghai/module/iot/gateway/codec/jt808/IotJt808DeviceMessageCodec.java
+++ b/viewshanghai-module-iot/viewshanghai-module-iot-gateway/src/main/java/com/viewshanghai/module/iot/gateway/codec/jt808/IotJt808DeviceMessageCodec.java
@@ -82,15 +82,27 @@ public class IotJt808DeviceMessageCodec implements IotDeviceMessageCodec {
     public IotDeviceMessage decode(byte[] bytes) {
         Assert.notNull(bytes, "待解码数据不能为空");
         Assert.isTrue(bytes.length >= 12, "数据包长度不足");
-        
+
         try {
-            // 1. 反转义（去除首尾标识符）
+            // 1. 验证并去除首尾标识符 0x7e
+            // JT808格式: 0x7e + 消息头 + 消息体 + 校验码 + 0x7e
+            if (bytes[0] != (byte) 0x7e || bytes[bytes.length - 1] != (byte) 0x7e) {
+                throw new IllegalArgumentException("JT808消息格式错误：缺少首尾标识符0x7e");
+            }
+
+            // 2. 反转义处理（处理0x7d01->0x7d, 0x7d02->0x7e）
+            // doEscape4Receive会保留start之前和end之后的字节，所以传入1和length-1来处理中间部分
             byte[] unescapedBytes = protocolUtil.doEscape4Receive(bytes, 1, bytes.length - 1);
-            
-            // 2. 解析为 JT808 数据包
-            Jt808DataPack dataPack = decoder.bytes2PackageData(unescapedBytes);
-            
-            // 3. 转换为统一的 IotDeviceMessage
+
+            // 3. 从反转义后的数据中提取实际内容（去掉首尾的0x7e）
+            // doEscape4Receive保留了首尾的0x7e，需要再次去除
+            byte[] actualData = new byte[unescapedBytes.length - 2];
+            System.arraycopy(unescapedBytes, 1, actualData, 0, actualData.length);
+
+            // 4. 解析为 JT808 数据包（此时数据已经是纯净的消息内容，不含0x7e）
+            Jt808DataPack dataPack = decoder.bytes2PackageData(actualData);
+
+            // 5. 转换为统一的 IotDeviceMessage
             return convertToIotDeviceMessage(dataPack);
         } catch (Exception e) {
             log.error("[decode][JT808 消息解码失败，数据长度: {}]", bytes.length, e);