diff --git a/viewsh-module-iot/viewsh-module-iot-gateway/src/main/java/com/viewsh/module/iot/gateway/codec/jt808/util/Jt808ProtocolUtil.java b/viewsh-module-iot/viewsh-module-iot-gateway/src/main/java/com/viewsh/module/iot/gateway/codec/jt808/util/Jt808ProtocolUtil.java
index 55a439d..47cb981 100644
--- a/viewsh-module-iot/viewsh-module-iot-gateway/src/main/java/com/viewsh/module/iot/gateway/codec/jt808/util/Jt808ProtocolUtil.java
+++ b/viewsh-module-iot/viewsh-module-iot-gateway/src/main/java/com/viewsh/module/iot/gateway/codec/jt808/util/Jt808ProtocolUtil.java
@@ -38,26 +38,23 @@ public class Jt808ProtocolUtil {
         }
         
         try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
-            // 写入起始部分
-            for (int i = 0; i < start; i++) {
-                baos.write(bs[i]);
-            }
-            // 处理需要反转义的部分
-            for (int i = start; i < end - 1; i++) {
-                if (bs[i] == 0x7d && bs[i + 1] == 0x01) {
-                    baos.write(0x7d);
-                    i++;
-                } else if (bs[i] == 0x7d && bs[i + 1] == 0x02) {
-                    baos.write(0x7e);
-                    i++;
+            // 只处理 start 到 end 范围内的数据（不包含 start 之前和 end 之后的数据）
+            // 这样返回的数组就是纯净的、去除了首尾标识符且已反转义的数据包
+            for (int i = start; i < end; i++) {
+                if (bs[i] == 0x7d && i + 1 < end) { // 确保 i+1 不越界
+                    if (bs[i + 1] == 0x01) {
+                        baos.write(0x7d);
+                        i++;
+                    } else if (bs[i + 1] == 0x02) {
+                        baos.write(0x7e);
+                        i++;
+                    } else {
+                        baos.write(bs[i]);
+                    }
                 } else {
                     baos.write(bs[i]);
                 }
             }
-            // 写入结束部分
-            for (int i = end - 1; i < bs.length; i++) {
-                baos.write(bs[i]);
-            }
             return baos.toByteArray();
         }
     }