diff --git a/components/monitoring/MonitoringTopologyView.tsx b/components/monitoring/MonitoringTopologyView.tsx
index 6164d0d..f968e21 100644
--- a/components/monitoring/MonitoringTopologyView.tsx
+++ b/components/monitoring/MonitoringTopologyView.tsx
@@ -2309,7 +2309,11 @@ export function MonitoringTopologyView({ hosts, keys }: Props) {
       // 本地 Electron：从 localStorage 读，找不到则从主进程 inspection-data.json 读
       try {
         let saved = localStorage.getItem('monitoring-topology-positions');
-        if (saved) return JSON.parse(saved);
+        if (saved) {
+          const parsed = JSON.parse(saved);
+          // 空对象 {} 等于没有，继续 fallback
+          if (parsed && typeof parsed === 'object' && Object.keys(parsed).length > 0) return parsed;
+        }
         // portable 版 localStorage 为空 → fallback 主进程 JSON（sendSync 同步）
         try {
           const nc = (window as any).netcatty;
@@ -2332,7 +2336,7 @@ export function MonitoringTopologyView({ hosts, keys }: Props) {
     const MIN_Y = -0.5;
     const MAX_Y = 20;
 
-    if (savedPositions) {
+    if (savedPositions && Object.keys(savedPositions).length > 0) {
       devices.forEach((d) => {
         if (savedPositions[d.id]) {
           positions[d.id] = new THREE.Vector3(