diff --git a/src/ble/discovery.js b/src/ble/discovery.js
index 9d77669..696810b 100644
--- a/src/ble/discovery.js
+++ b/src/ble/discovery.js
@@ -1,6 +1,7 @@
 import {
   BLUETOOTH_ERROR_MESSAGES,
   DEFAULT_BLUETOOTH_ERROR_MESSAGE,
+  DISCOVERY_FILTER_SERVICE_UUIDS,
   TARGET_SERVICE_UUID_FULL,
   TARGET_SERVICE_UUID_ALT_FULL,
   TARGET_SERVICE_UUID_COMPAT_FULL,
@@ -13,6 +14,8 @@ import Taro from '@tarojs/taro'
 const RESTART_SCAN_DELAY_MS = 120
 const DISCOVERY_POLL_INTERVAL_MS = 1200
 const SCAN_DURATION_MS = 30000
+// 过滤扫描无结果多久后切到无过滤全扫
+const FILTER_SCAN_TIMEOUT_MS = 4000
 // 设备列表 UI 刷新最小间隔：搜索中 allowDuplicatesKey=true，目标设备每秒广播
 // 数次，不节流会以每秒数十次 setState 打满小程序渲染线程，点击被排队卡死
 const DEVICE_LIST_EMIT_INTERVAL_MS = 300
@@ -81,6 +84,7 @@ export function createBluetoothDiscovery(options = {}) {
   let discoveryPollTimer = null
   let autoStopTimer = null
   let deviceListEmitTimer = null
+  let filterFallbackTimer = null
 
   let offDeviceFound = null
   let offAdapterState = null
@@ -282,6 +286,19 @@ export function createBluetoothDiscovery(options = {}) {
     ].join('#')
   }
 
+  function hasTargetDeviceInMap() {
+    return Object.values(deviceMap).some((item) => item.isTargetDevice)
+  }
+
+  function clearFallbackTimer() {
+    if (!filterFallbackTimer) {
+      return
+    }
+
+    clearTimeout(filterFallbackTimer)
+    filterFallbackTimer = null
+  }
+
   function clearDiscoveryPollTimer() {
     if (!discoveryPollTimer) {
       return
@@ -350,12 +367,12 @@ export function createBluetoothDiscovery(options = {}) {
 
   function upsertDevice(rawDevice) {
     if (!rawDevice || !rawDevice.deviceId) {
-      return
+      return false
     }
 
     const matched = matchTargetDevice(rawDevice)
     if (!matched.isTarget) {
-      return
+      return false
     }
 
     const existing = deviceMap[rawDevice.deviceId] || {}
@@ -374,13 +391,14 @@ export function createBluetoothDiscovery(options = {}) {
     const nextSignature = getDeviceStableSignature(merged)
 
     if (prevSignature === nextSignature) {
-      return
+      return false
     }
 
     setDeviceMap({
       ...deviceMap,
       [rawDevice.deviceId]: merged
     })
+    return true
   }
 
   function getBluetoothErrorText(error) {
@@ -415,13 +433,19 @@ export function createBluetoothDiscovery(options = {}) {
       }
 
       const currentSession = searchSessionId
+      let hitCount = 0
       devices.forEach((device) => {
         if (!acceptingDeviceEvents || currentSession !== searchSessionId) {
           return
         }
 
-        upsertDevice(device)
+        if (upsertDevice(device)) {
+          hitCount += 1
+        }
       })
+      if (hitCount) {
+        console.debug('[BLE][FOUND]', 'event devices=', devices.length, 'newHits=', hitCount)
+      }
     })
 
     offAdapterState = controller.ble.on('adapter:state', (state) => {
@@ -562,13 +586,18 @@ export function createBluetoothDiscovery(options = {}) {
     try {
       const result = await promisifyTaroApi('getBluetoothDevices')
       const list = Array.isArray(result?.devices) ? result.devices : []
+      // 排障日志：原生层到底采到了多少设备、命中了多少目标（真机 vConsole 可见）
+      let hitCount = 0
       list.forEach((device) => {
         if (!isSearching || !acceptingDeviceEvents || sessionId !== searchSessionId) {
           return
         }
 
-        upsertDevice(device)
+        if (upsertDevice(device)) {
+          hitCount += 1
+        }
       })
+      console.debug('[BLE][SCAN]', 'native devices=', list.length, 'newHits=', hitCount)
     } catch (error) {
     }
   }
@@ -593,10 +622,36 @@ export function createBluetoothDiscovery(options = {}) {
     discoveryPollTimer = setTimeout(run, 300)
   }
 
+  // 过滤扫描超过 4s 仍无目标设备：停扫 → 等待 → 切无过滤全频段扫描。
+  // 微信 services 过滤只按 128 位完整 UUID 匹配广播包，16 位短 UUID 设备
+  // 会被过滤掉，必须靠兜底全扫 + JS 层 matchTargetDevice 兜住
+  async function fallbackToUnfilteredDiscoveryIfNeeded(sessionId) {
+    clearFallbackTimer()
+
+    filterFallbackTimer = setTimeout(async () => {
+      if (!isSearching || !acceptingDeviceEvents || sessionId !== searchSessionId || hasTargetDeviceInMap()) {
+        return
+      }
+
+      try {
+        console.debug('[BLE][SCAN]', 'filtered scan found nothing, fallback to unfiltered')
+        await stopDiscoverySilently()
+        await delay(RESTART_SCAN_DELAY_MS)
+
+        if (!isSearching || !acceptingDeviceEvents || sessionId !== searchSessionId) {
+          return
+        }
+
+        await startDiscoveryWithServices([])
+      } catch (error) {
+      }
+    }, FILTER_SCAN_TIMEOUT_MS)
+  }
+
   /**
-   * 设备搜索：先无过滤全频段扫描（onBluetoothDeviceFound 事件驱动 + getBluetoothDevices 轮询双通道），
-   * 命中关键词/服务 UUID 即入列。微信的 services 过滤只匹配 128 位完整 UUID，
-   * 对 16 位广播 UUID（0x00F4 等）的设备经常过滤过头导致搜不到，故不再走过滤扫描。
+   * 设备搜索：
+   * 优先按 0xFFF4/0x00F4/0xF400 过滤扫描（快、列表干净）；
+   * 4s 无结果自动切到无过滤全扫（兜住 16 位短 UUID 设备）并轮询 getBluetoothDevices。
    */
   async function startSearch() {
     if (isSearching) {
@@ -606,6 +661,7 @@ export function createBluetoothDiscovery(options = {}) {
     // 立即标记搜索中，防止 await 期间用户重复点击或 stopSearch 被覆盖
     isSearching = true
     onSearchingChange(true)
+    clearFallbackTimer()
     clearDiscoveryPollTimer()
     clearAutoStopTimer()
 
@@ -634,13 +690,21 @@ export function createBluetoothDiscovery(options = {}) {
 
       acceptingDeviceEvents = true
 
-      await startDiscoveryWithServices([])
+      try {
+        await startDiscoveryWithServices(DISCOVERY_FILTER_SERVICE_UUIDS)
+        console.debug('[BLE][SCAN]', 'filtered discovery started, sessionId=', sessionId)
+      } catch (startError) {
+        console.debug('[BLE][SCAN]', 'filtered start failed, retry unfiltered', startError)
+        await startDiscoveryWithServices([])
+        console.debug('[BLE][SCAN]', 'unfiltered discovery started (after filter fail), sessionId=', sessionId)
+      }
 
       if (sessionId !== searchSessionId) {
         return
       }
 
       startDiscoveryPolling(sessionId)
+      await fallbackToUnfilteredDiscoveryIfNeeded(sessionId)
 
       // 30s 自动停止搜索
       autoStopTimer = setTimeout(() => {
@@ -658,6 +722,7 @@ export function createBluetoothDiscovery(options = {}) {
   }
 
   async function stopSearch(showStopToast = true) {
+    clearFallbackTimer()
     clearDiscoveryPollTimer()
     clearAutoStopTimer()
 
@@ -863,6 +928,7 @@ export function createBluetoothDiscovery(options = {}) {
   }
 
   function cleanupDiscovery() {
+    clearFallbackTimer()
     clearDiscoveryPollTimer()
     clearDeviceListEmitTimer()
 
diff --git a/src/constants/bluetooth.js b/src/constants/bluetooth.js
index 9876619..4984659 100644
--- a/src/constants/bluetooth.js
+++ b/src/constants/bluetooth.js
@@ -16,6 +16,16 @@ export const TARGET_SHORT_UUID_CANDIDATES = Object.freeze([
   TARGET_SERVICE_UUID_COMPAT
 ])
 
+/**
+ * 过滤扫描用的 128 位完整 UUID 列表（与 advertisServiceUUIDs 匹配主服务）。
+ * 微信 services 过滤只认完整 UUID；广播 16 位短 UUID 的机型由无过滤兜底全扫 + JS 层匹配覆盖。
+ */
+export const DISCOVERY_FILTER_SERVICE_UUIDS = Object.freeze([
+  TARGET_SERVICE_UUID_COMPAT_FULL,
+  TARGET_SERVICE_UUID_FULL,
+  TARGET_SERVICE_UUID_ALT_FULL
+])
+
 /**
  * 蓝牙常见错误提示映射。
  */