diff --git a/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/impl/SIPCommander.java b/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/impl/SIPCommander.java
index 9b9ca2b5..b70f353e 100644
--- a/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/impl/SIPCommander.java
+++ b/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/impl/SIPCommander.java
@@ -101,7 +101,7 @@ public class SIPCommander implements ISIPCommander {
     * @param upDown     镜头上移下移 0:停止 1:上移 2:下移
     * @param inOut      镜头放大缩小 0:停止 1:缩小 2:放大
     * @param moveSpeed  镜头移动速度 默认 0XFF (0-255)
-    * @param zoomSpeed  镜头缩放速度 默认 0X1 (0-15)
+    * @param zoomSpeed  镜头缩放速度 默认 0X1 (0-255)
     */
     public static String cmdString(int leftRight, int upDown, int inOut, int moveSpeed, int zoomSpeed) {
 		int cmdCode = 0;
@@ -127,12 +127,10 @@ public class SIPCommander implements ISIPCommander {
 		strTmp = String.format("%02X", moveSpeed);
 		builder.append(strTmp, 0, 2);
 		builder.append(strTmp, 0, 2);
-		// strTmp = String.format("%X", zoomSpeed);
-		int zs=(zoomSpeed<<4 & 0XF0);
-		strTmp = String.format("%X", zs);
+		strTmp = String.format("%X", zoomSpeed);
 		builder.append(strTmp, 0, 1).append("0");
 		//计算校验码
-		int checkCode = (0XA5 + 0X0F + 0X01 + cmdCode + moveSpeed + moveSpeed + zs/*(zoomSpeed << 4 & 0XF0)*/) % 0X100;
+		int checkCode = (0XA5 + 0X0F + 0X01 + cmdCode + moveSpeed + moveSpeed + (zoomSpeed /*<< 4*/ & 0XF0)) % 0X100;
 		strTmp = String.format("%02X", checkCode);
 		builder.append(strTmp, 0, 2);
 		return builder.toString();