diff --git a/entry/src/main/ets/common/utils/UdpJudge.ts b/entry/src/main/ets/common/utils/UdpJudge.ts
index 1a287d58..b9331240 100644
--- a/entry/src/main/ets/common/utils/UdpJudge.ts
+++ b/entry/src/main/ets/common/utils/UdpJudge.ts
@@ -60,8 +60,8 @@ export const getMessageHeartbeat = async (msg) => {
   const {fourInOneScreen:{gpsDigit}} = judgeConfig
   const asclshArr = stringToASC(fillZero(
     globalThis.singlePlay
-      ? '1111111111111'
-      : globalThis.lsh,
+      ? (examSubject == 2 ? '0000000000000' : '0000000000000')
+      : (globalThis.lsh ||  '0000000000000'),
     13));
   const ascksyhArr = stringToASC(fillZero(examSubject == 2 ? '0000000000000':'1111111111111', 13))
   const ascsbxhArr = stringToASC('00000000')