diff --git a/src/ble/discovery.js b/src/ble/discovery.js
index eee35fc..54c2ed9 100644
--- a/src/ble/discovery.js
+++ b/src/ble/discovery.js
@@ -15,6 +15,9 @@ const FILTER_SCAN_TIMEOUT_MS = 4000
 const RESTART_SCAN_DELAY_MS = 120
 const DISCOVERY_POLL_INTERVAL_MS = 1200
 const SCAN_DURATION_MS = 30000
+// 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
 const TARGET_NAME_KEYWORDS = Object.freeze(['ED713', '713WQ', 'ED719', 'EP832'])
 
 function promisifyTaroApi(apiName, params = {}) {
@@ -80,6 +83,7 @@ export function createBluetoothDiscovery(options = {}) {
   let filterFallbackTimer = null
   let discoveryPollTimer = null
   let autoStopTimer = null
+  let deviceListEmitTimer = null
 
   let offDeviceFound = null
   let offAdapterState = null
@@ -116,14 +120,41 @@ export function createBluetoothDiscovery(options = {}) {
     onDeviceListChange(getSortedDeviceList())
   }
 
+  // 广播包持续到达时（RSSI 每包都变，签名判重挡不住），节流 UI 刷新；
+  // 数据仍实时合入 deviceMap，只是通知 UI 的频率被压到每 300ms 一次。
+  // 末包到达后补一次尾部刷新，保证最后一帧数据不丢
+  function emitDeviceListThrottled() {
+    if (deviceListEmitTimer) {
+      return
+    }
+
+    deviceListEmitTimer = setTimeout(() => {
+      deviceListEmitTimer = null
+      emitDeviceList()
+    }, DEVICE_LIST_EMIT_INTERVAL_MS)
+  }
+
+  function clearDeviceListEmitTimer() {
+    if (!deviceListEmitTimer) {
+      return
+    }
+
+    clearTimeout(deviceListEmitTimer)
+    deviceListEmitTimer = null
+  }
+
   function setDeviceMap(nextMap) {
     deviceMap = nextMap
     onDeviceMapChange({...deviceMap})
-    emitDeviceList()
+    emitDeviceListThrottled()
   }
 
   function resetDeviceMap() {
-    setDeviceMap({})
+    clearDeviceListEmitTimer()
+    deviceMap = {}
+    onDeviceMapChange({...deviceMap})
+    // 重置列表必须立即通知：清空操作不能等 300ms 节流窗口
+    emitDeviceList()
   }
 
   function normalizeUuid(uuid) {
@@ -687,6 +718,10 @@ export function createBluetoothDiscovery(options = {}) {
     }
 
     await stopDiscoverySilently()
+
+    // 停搜后立即冲刷最后一帧列表，避免 pending 的节流定时器延迟刷新
+    clearDeviceListEmitTimer()
+    emitDeviceList()
   }
 
   function pickPreferredDeviceId(deviceId) {
@@ -874,6 +909,7 @@ export function createBluetoothDiscovery(options = {}) {
   function cleanupDiscovery() {
     clearFallbackTimer()
     clearDiscoveryPollTimer()
+    clearDeviceListEmitTimer()
 
     searchSessionId += 1
     acceptingDeviceEvents = false