diff --git a/src/components/device/device-card/components/current-diag/security-box-circuit-card.vue b/src/components/device/device-card/components/current-diag/security-box-circuit-card.vue
index 480b396..9be2169 100644
--- a/src/components/device/device-card/components/current-diag/security-box-circuit-card.vue
+++ b/src/components/device/device-card/components/current-diag/security-box-circuit-card.vue
@@ -144,9 +144,24 @@ const getLowerDeviceByCircuitIndex = (circuitIndex: number) => {
   const stationDevices = lineDevices.value[stationCode];
   if (!stationDevices) return null;
   const devices = stationDevices[deviceType];
-  const device = devices.find((device) => device.id === deviceDbId);
-  if (!device) return null;
-  return device;
+  const lowerDevice = devices.find((device) => device.id === deviceDbId);
+  if (!lowerDevice) {
+    // 下游设备不存在时解除关联
+    const modifiedUpperDevice = cloneDeep(ndmDevice.value);
+    const modifiedUpperLinkDescription = cloneDeep(upperDeviceLinkDescription.value);
+    delete modifiedUpperLinkDescription.downstream?.[circuitIndex];
+    modifiedUpperDevice.linkDescription = JSON.stringify(modifiedUpperLinkDescription);
+    // 不需要等待异步
+    const stationCode = station.value.code;
+    updateDeviceApi(modifiedUpperDevice, { stationCode }).then(() => {
+      detailDeviceApi(modifiedUpperDevice, { stationCode }).then((upperDevice) => {
+        if (!upperDevice) return;
+        deviceStore.patchDevice(stationCode, { ...upperDevice });
+      });
+    });
+    return null;
+  }
+  return lowerDevice;
 };
 
 // 获取从父组件注入的selectDevice函数
diff --git a/src/components/device/device-card/components/current-diag/switch-port-card.vue b/src/components/device/device-card/components/current-diag/switch-port-card.vue
index 7b8c0d2..8fcc105 100644
--- a/src/components/device/device-card/components/current-diag/switch-port-card.vue
+++ b/src/components/device/device-card/components/current-diag/switch-port-card.vue
@@ -84,19 +84,33 @@ const upperDeviceLinkDescription = computed(() => {
 });
 
 const getLowerDeviceByPort = (port: NdmSwitchPortInfo) => {
-  const portName = port.portName;
   if (!upperDeviceLinkDescription.value) return null;
   const downstream = upperDeviceLinkDescription.value.downstream;
   if (!downstream) return null;
-  const deviceStoreIndex = downstream[portName];
+  const deviceStoreIndex = downstream[port.portName];
   if (!deviceStoreIndex) return null;
   const { stationCode, deviceType, deviceDbId } = deviceStoreIndex;
   const stationDevices = lineDevices.value[stationCode];
   if (!stationDevices) return null;
   const devices = stationDevices[deviceType];
-  const device = devices.find((device) => device.id === deviceDbId);
-  if (!device) return null;
-  return device;
+  const lowerDevice = devices.find((device) => device.id === deviceDbId);
+  if (!lowerDevice) {
+    // 下游设备不存在时解除关联
+    const modifiedUpperDevice = cloneDeep(ndmDevice.value);
+    const modifiedUpperLinkDescription = cloneDeep(upperDeviceLinkDescription.value);
+    delete modifiedUpperLinkDescription.downstream?.[port.portName];
+    modifiedUpperDevice.linkDescription = JSON.stringify(modifiedUpperLinkDescription);
+    // 不需要等待异步
+    const stationCode = station.value.code;
+    updateDeviceApi(modifiedUpperDevice, { stationCode }).then(() => {
+      detailDeviceApi(modifiedUpperDevice, { stationCode }).then((upperDevice) => {
+        if (!upperDevice) return;
+        deviceStore.patchDevice(stationCode, { ...upperDevice });
+      });
+    });
+    return null;
+  }
+  return lowerDevice;
 };
 
 // 获取从父组件注入的selectDevice函数