diff --git a/src/main/java/com/tuoheng/machine/statemachine/MachineStateManager.java b/src/main/java/com/tuoheng/machine/statemachine/MachineStateManager.java
index 97e3bb8..96ad21e 100644
--- a/src/main/java/com/tuoheng/machine/statemachine/MachineStateManager.java
+++ b/src/main/java/com/tuoheng/machine/statemachine/MachineStateManager.java
@@ -89,29 +89,53 @@ public class MachineStateManager {
 
     /**
      * 批量更新状态（用于心跳同步）
+     * 只更新非UNKNOWN的状态，避免覆盖已有状态
      */
     public void updateStates(String sn, MachineStates newStates) {
+        updateStates(sn, newStates, false);
+    }
+
+    /**
+     * 批量更新状态（用于心跳同步）
+     *
+     * @param sn 设备SN号
+     * @param newStates 新状态
+     * @param forceUpdate 是否强制更新所有状态（包括UNKNOWN）
+     */
+    public void updateStates(String sn, MachineStates newStates, boolean forceUpdate) {
         MachineStates currentStates = getStates(sn);
         boolean changed = false;
 
-        if (currentStates.getDroneState() != newStates.getDroneState()) {
-            currentStates.setDroneState(newStates.getDroneState());
-            changed = true;
+        // 更新无人机状态（如果不是UNKNOWN或强制更新）
+        if (forceUpdate || newStates.getDroneState() != DroneState.UNKNOWN) {
+            if (currentStates.getDroneState() != newStates.getDroneState()) {
+                currentStates.setDroneState(newStates.getDroneState());
+                changed = true;
+            }
         }
 
-        if (currentStates.getAirportState() != newStates.getAirportState()) {
-            currentStates.setAirportState(newStates.getAirportState());
-            changed = true;
+        // 更新机巢状态（如果不是UNKNOWN或强制更新）
+        if (forceUpdate || newStates.getAirportState() != AirportState.UNKNOWN) {
+            if (currentStates.getAirportState() != newStates.getAirportState()) {
+                currentStates.setAirportState(newStates.getAirportState());
+                changed = true;
+            }
         }
 
-        if (currentStates.getCoverState() != newStates.getCoverState()) {
-            currentStates.setCoverState(newStates.getCoverState());
-            changed = true;
+        // 更新舱门状态（如果不是UNKNOWN或强制更新）
+        if (forceUpdate || newStates.getCoverState() != CoverState.UNKNOWN) {
+            if (currentStates.getCoverState() != newStates.getCoverState()) {
+                currentStates.setCoverState(newStates.getCoverState());
+                changed = true;
+            }
         }
 
-        if (currentStates.getDrcState() != newStates.getDrcState()) {
-            currentStates.setDrcState(newStates.getDrcState());
-            changed = true;
+        // 更新DRC状态（如果不是UNKNOWN或强制更新）
+        if (forceUpdate || newStates.getDrcState() != DrcState.UNKNOWN) {
+            if (currentStates.getDrcState() != newStates.getDrcState()) {
+                currentStates.setDrcState(newStates.getDrcState());
+                changed = true;
+            }
         }
 
         if (changed) {