diff --git a/sec-beidou/src/main/java/com/imdroid/beidou/controller/APIController.java b/sec-beidou/src/main/java/com/imdroid/beidou/controller/APIController.java
index bf26f0bd..71c54af7 100644
--- a/sec-beidou/src/main/java/com/imdroid/beidou/controller/APIController.java
+++ b/sec-beidou/src/main/java/com/imdroid/beidou/controller/APIController.java
@@ -82,8 +82,8 @@ public class APIController extends BasicController{
     }
 
     void checkWorkCycle(GnssDevice device, String cfgData){
-        // d31200120081e76f010a09000001c2dd7ae1419ee148
-        int pos = 10;
+        // d3 12 00 12 00 81 e7 6f 01 0a09000001c2dd7ae1419ee148
+        int pos = 9;
         byte[] hexValues = ByteUtil.hexStringTobyte(cfgData);
         byte workCycle = hexValues[pos++];
         byte workDur = hexValues[pos++];