diff --git a/docker/wvp/wvpcode/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/event/request/impl/message/response/cmd/ConfigDownloadResponseMessageHandler.java b/docker/wvp/wvpcode/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/event/request/impl/message/response/cmd/ConfigDownloadResponseMessageHandler.java
index 6aa5cfa..da2526c 100755
--- a/docker/wvp/wvpcode/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/event/request/impl/message/response/cmd/ConfigDownloadResponseMessageHandler.java
+++ b/docker/wvp/wvpcode/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/event/request/impl/message/response/cmd/ConfigDownloadResponseMessageHandler.java
@@ -78,9 +78,17 @@ public class ConfigDownloadResponseMessageHandler extends SIPRequestProcessorPar
             Integer heartBeatInterval = basicParam.getInteger("HeartBeatInterval");
             Integer heartBeatCount = basicParam.getInteger("HeartBeatCount");
             Integer positionCapability = basicParam.getInteger("PositionCapability");
-            device.setHeartBeatInterval(heartBeatInterval);
-            device.setHeartBeatCount(heartBeatCount);
-            device.setPositionCapability(positionCapability);
+
+            // 只在值不为 null 时才设置，避免覆盖默认值
+            if (heartBeatInterval != null) {
+                device.setHeartBeatInterval(heartBeatInterval);
+            }
+            if (heartBeatCount != null) {
+                device.setHeartBeatCount(heartBeatCount);
+            }
+            if (positionCapability != null) {
+                device.setPositionCapability(positionCapability);
+            }
 
             deviceService.updateDeviceHeartInfo(device);
         }