diff --git a/miniprogram/app.js b/miniprogram/app.js
index 9486352..782f46e 100644
--- a/miniprogram/app.js
+++ b/miniprogram/app.js
@@ -40,6 +40,7 @@ App({
         success: function (res) {
           http.post('/api/v1/auth/login', { code: res.code }).then(function (data) {
             wx.setStorageSync('token', data.token)
+            wx.setStorageSync('token_expiry', String(Math.floor(Date.now() / 1000) + (data.expires_in || 604800)))
             var app = getApp()
             app.globalData.userInfo = data.user_info
             app.globalData.userId = data.user_id
diff --git a/miniprogram/pages/treating/treating.js b/miniprogram/pages/treating/treating.js
index 7b6cd4f..298119f 100644
--- a/miniprogram/pages/treating/treating.js
+++ b/miniprogram/pages/treating/treating.js
@@ -33,9 +33,15 @@ Page({
     this._onStatus = this.onStatus.bind(this)
     this._onComplete = this.onComplete.bind(this)
     this._onException = this.onException.bind(this)
+    this._onDisconnect = this.onDisconnect.bind(this)
+    this._onReconnect = this.onReconnect.bind(this)
+    this._onReconnectFailed = this.onReconnectFailed.bind(this)
     ble.on('status', this._onStatus)
     ble.on('treatment_complete', this._onComplete)
     ble.on('exception', this._onException)
+    ble.on('disconnected', this._onDisconnect)
+    ble.on('reconnected', this._onReconnect)
+    ble.on('reconnect_failed', this._onReconnectFailed)
     this.startLocalTimer()
     this.syncCommands()
   },
@@ -44,6 +50,9 @@ Page({
     if (this._onStatus) ble.off('status', this._onStatus)
     if (this._onComplete) ble.off('treatment_complete', this._onComplete)
     if (this._onException) ble.off('exception', this._onException)
+    if (this._onDisconnect) ble.off('disconnected', this._onDisconnect)
+    if (this._onReconnect) ble.off('reconnected', this._onReconnect)
+    if (this._onReconnectFailed) ble.off('reconnect_failed', this._onReconnectFailed)
     if (this._localTimer) clearInterval(this._localTimer)
   },
 
@@ -131,6 +140,40 @@ Page({
     })
   },
 
+  onDisconnect: function () {
+    this.setData({ paused: true })
+    wx.showToast({
+      title: '设备连接断开，正在重连...',
+      icon: 'none',
+      duration: 3000
+    })
+  },
+
+  onReconnect: function () {
+    this.setData({ paused: false })
+    wx.showToast({
+      title: '设备已重新连接',
+      icon: 'success',
+      duration: 2000
+    })
+  },
+
+  onReconnectFailed: function () {
+    var self = this
+    if (this._localTimer) {
+      clearInterval(this._localTimer)
+      this._localTimer = null
+    }
+    wx.showModal({
+      title: '连接丢失',
+      content: '设备蓝牙连接已断开，无法恢复。本次护理数据将保存。',
+      showCancel: false,
+      complete: function () {
+        self.finishAsComplete()
+      }
+    })
+  },
+
   onStop: function () {
     var self = this
     wx.showModal({
diff --git a/miniprogram/services/ble.js b/miniprogram/services/ble.js
index f657c5b..cb25910 100644
--- a/miniprogram/services/ble.js
+++ b/miniprogram/services/ble.js
@@ -88,6 +88,8 @@ var _chars = {}
 var _cmdSeq = 0
 var _pendingAcks = {}
 var _listeners = {}
+var _autoReconnect = true
+var _reconnecting = false
 
 function nextSeq() {
   _cmdSeq = (_cmdSeq + 1) % 256
@@ -456,6 +458,28 @@ function writeCommand(type, payload) {
   })
 }
 
+function writeCommandWithRetry(type, payload, maxRetries) {
+  if (maxRetries === undefined) maxRetries = 3
+  var attempt = 0
+  function tryOnce() {
+    attempt++
+    return writeCommand(type, payload).catch(function (err) {
+      if (err && err.error_code === 0x0C) {
+        return Promise.reject(err)
+      }
+      if (attempt >= maxRetries) {
+        return Promise.reject(err)
+      }
+      return new Promise(function (resolve) {
+        setTimeout(resolve, 500)
+      }).then(function () {
+        return tryOnce()
+      })
+    })
+  }
+  return tryOnce()
+}
+
 function readDeviceInfo() {
   return new Promise(function (resolve, reject) {
     if (!_connected || !_deviceId || !_chars.deviceInfo) {
@@ -507,20 +531,20 @@ function setParams(options) {
     return a.concat(Array.isArray(b) ? b : [b])
   }, [])
 
-  return writeCommand(CMD.SET_PARAMS, payload)
+  return writeCommandWithRetry(CMD.SET_PARAMS, payload)
 }
 
 function startTreatment(regionMask) {
   var mask = regionMask || REGION.FULL_FACE
-  return writeCommand(CMD.START, [mask])
+  return writeCommandWithRetry(CMD.START, [mask])
 }
 
 function stopTreatment() {
-  return writeCommand(CMD.STOP, [])
+  return writeCommandWithRetry(CMD.STOP, [])
 }
 
 function queryStatus() {
-  return writeCommand(CMD.QUERY_STATUS, [])
+  return writeCommandWithRetry(CMD.QUERY_STATUS, [])
 }
 
 function bindDevice(userId, bindToken) {
@@ -530,13 +554,13 @@ function bindDevice(userId, bindToken) {
   var tsBytes = uint32ToBytes(ts)
 
   var payload = [0x01].concat(userBytes).concat(tokenBytes).concat(tsBytes)
-  return writeCommand(CMD.BIND, payload)
+  return writeCommandWithRetry(CMD.BIND, payload)
 }
 
 function unbindDevice(userId) {
   var userBytes = hexToBytes(userId)
   var payload = [0x02].concat(userBytes)
-  return writeCommand(CMD.UNBIND, payload)
+  return writeCommandWithRetry(CMD.UNBIND, payload)
 }
 
 function stopScan() {
@@ -545,6 +569,8 @@ function stopScan() {
 }
 
 function disconnect() {
+  _autoReconnect = false
+  _reconnecting = false
   if (_deviceId) {
     wx.closeBLEConnection({ deviceId: _deviceId })
     _deviceId = null
@@ -556,10 +582,83 @@ function disconnect() {
   wx.closeBluetoothAdapter({})
 }
 
+function attemptReconnect(deviceId, retriesLeft) {
+  wx.createBLEConnection({
+    deviceId: deviceId,
+    timeout: 10000,
+    success: function () {
+      _connected = true
+      _chars = {}
+      wx.getBLEDeviceServices({
+        deviceId: deviceId,
+        success: function (res) {
+          var services = res.services
+          var serviceMap = {}
+          for (var i = 0; i < services.length; i++) {
+            var uuid = services[i].uuid.toUpperCase()
+            if (uuid.indexOf(SERVICE.DEVICE_INFO) !== -1) {
+              serviceMap.deviceInfo = services[i].uuid
+            } else if (uuid.indexOf(SERVICE.DATA_COMM) !== -1) {
+              serviceMap.dataComm = services[i].uuid
+            }
+          }
+
+          var tasks = []
+          if (serviceMap.deviceInfo) {
+            tasks.push(discoverChars(deviceId, serviceMap.deviceInfo, 'deviceInfo'))
+          }
+          if (serviceMap.dataComm) {
+            tasks.push(discoverChars(deviceId, serviceMap.dataComm, 'dataComm'))
+          }
+
+          Promise.all(tasks).then(function () {
+            var serviceId = serviceMap.dataComm || null
+            return subscribeToNotifications(deviceId, serviceId)
+          }).then(function () {
+            _reconnecting = false
+            emit('reconnected', { deviceId: deviceId })
+          })
+        },
+        fail: function () {
+          // Service discovery failed, treat as reconnect failure
+          if (retriesLeft > 1) {
+            setTimeout(function () {
+              attemptReconnect(deviceId, retriesLeft - 1)
+            }, 2000)
+          } else {
+            _reconnecting = false
+            emit('reconnect_failed', { deviceId: deviceId })
+          }
+        }
+      })
+    },
+    fail: function () {
+      if (retriesLeft > 1) {
+        setTimeout(function () {
+          attemptReconnect(deviceId, retriesLeft - 1)
+        }, 2000)
+      } else {
+        _reconnecting = false
+        emit('reconnect_failed', { deviceId: deviceId })
+      }
+    }
+  })
+}
+
+function setAutoReconnect(enabled) {
+  _autoReconnect = enabled
+}
+
 wx.onBLEConnectionStateChange(function (res) {
   if (!res.connected) {
     _connected = false
     emit('disconnected', { deviceId: res.deviceId })
+    if (_autoReconnect && !_reconnecting && _deviceId) {
+      _reconnecting = true
+      setTimeout(function () {
+        attemptReconnect(_deviceId, 3)
+      }, 2000)
+    }
   }
 })
 
@@ -605,6 +704,7 @@ module.exports = {
   stopScan: stopScan,
   connect: connect,
   disconnect: disconnect,
+  setAutoReconnect: setAutoReconnect,
   on: on,
   off: off,
 
diff --git a/miniprogram/utils/request.js b/miniprogram/utils/request.js
index 58c016b..5d2ba3a 100644
--- a/miniprogram/utils/request.js
+++ b/miniprogram/utils/request.js
@@ -1,38 +1,95 @@
 var config = require('../config/env')
 var API_BASE = config.API_BASE
+var _refreshing = false
+var _refreshQueue = []
 
-function httpRequest(options) {
-  var token = wx.getStorageSync('token')
+function getTokenExpiry() {
+  return parseInt(wx.getStorageSync('token_expiry') || '0', 10)
+}
 
+function shouldRefresh() {
+  var expiry = getTokenExpiry()
+  if (!expiry) return false
+  var remaining = expiry - Math.floor(Date.now() / 1000)
+  return remaining > 0 && remaining < 86400
+}
+
+function refreshToken() {
+  if (_refreshing) {
+    return new Promise(function (resolve, reject) {
+      _refreshQueue.push({ resolve: resolve, reject: reject })
+    })
+  }
+  _refreshing = true
   return new Promise(function (resolve, reject) {
+    var token = wx.getStorageSync('token')
     wx.request({
-      url: API_BASE + options.path,
-      method: options.method || 'GET',
-      data: options.data || {},
-      header: Object.assign({
-        'Authorization': token ? 'Bearer ' + token : '',
-        'Content-Type': 'application/json',
-        'X-App-Version': '1.0.0',
-        'X-Platform': 'wechat'
-      }, options.header || {}),
+      url: API_BASE + '/api/v1/auth/refresh',
+      method: 'POST',
+      header: { 'Authorization': 'Bearer ' + token, 'Content-Type': 'application/json' },
+      data: {},
       success: function (res) {
-        if (res.data && res.data.code === 0) {
-          resolve(res.data.data)
-        } else if (res.data && res.data.code === 1001 || res.data && res.data.code === 1002) {
-          wx.removeStorageSync('token')
-          wx.reLaunch({ url: '/pages/login/login' })
-          reject(res.data)
+        if (res.data && res.data.code === 0 && res.data.data && res.data.data.token) {
+          wx.setStorageSync('token', res.data.data.token)
+          wx.setStorageSync('token_expiry', String(Math.floor(Date.now() / 1000) + (res.data.data.expires_in || 604800)))
+          resolve(res.data.data.token)
+          _refreshQueue.forEach(function (q) { q.resolve(res.data.data.token) })
         } else {
-          reject(res.data || { code: -1, message: '请求失败' })
+          resolve(null)
+          _refreshQueue.forEach(function (q) { q.resolve(null) })
         }
+        _refreshing = false
+        _refreshQueue = []
       },
-      fail: function (err) {
-        reject({ code: 2002, message: err.errMsg || '网络异常' })
+      fail: function () {
+        resolve(null)
+        _refreshQueue.forEach(function (q) { q.resolve(null) })
+        _refreshing = false
+        _refreshQueue = []
       }
     })
   })
 }
 
+function httpRequest(options) {
+  var doRequest = function () {
+    var token = wx.getStorageSync('token')
+    return new Promise(function (resolve, reject) {
+      wx.request({
+        url: API_BASE + options.path,
+        method: options.method || 'GET',
+        data: options.data || {},
+        header: Object.assign({
+          'Authorization': token ? 'Bearer ' + token : '',
+          'Content-Type': 'application/json',
+          'X-App-Version': '1.0.0',
+          'X-Platform': 'wechat'
+        }, options.header || {}),
+        success: function (res) {
+          if (res.data && res.data.code === 0) {
+            resolve(res.data.data)
+          } else if (res.data && res.data.code === 1001 || res.data && res.data.code === 1002) {
+            wx.removeStorageSync('token')
+            wx.removeStorageSync('token_expiry')
+            wx.reLaunch({ url: '/pages/login/login' })
+            reject(res.data)
+          } else {
+            reject(res.data || { code: -1, message: '请求失败' })
+          }
+        },
+        fail: function (err) {
+          reject({ code: 2002, message: err.errMsg || '网络异常' })
+        }
+      })
+    })
+  }
+
+  if (shouldRefresh() && options.path !== '/api/v1/auth/refresh') {
+    return refreshToken().then(function () { return doRequest() })
+  }
+  return doRequest()
+}
+
 function request(options) {
   return httpRequest(options)
 }
diff --git a/server/package-lock.json b/server/package-lock.json
index 67d7f85..7e7db4e 100644
--- a/server/package-lock.json
+++ b/server/package-lock.json
@@ -8,6 +8,7 @@
       "name": "hox-scf-api",
       "version": "1.0.0",
       "dependencies": {
+        "bcryptjs": "^2.4.3",
         "cos-nodejs-sdk-v5": "^2.14.7",
         "dotenv": "^16.4.5",
         "jsonwebtoken": "^9.0.2",
@@ -124,6 +125,12 @@
         "tweetnacl": "^0.14.3"
       }
     },
+    "node_modules/bcryptjs": {
+      "version": "2.4.3",
+      "resolved": "https://registry.npmmirror.com/bcryptjs/-/bcryptjs-2.4.3.tgz",
+      "integrity": "sha512-V/Hy/X9Vt7f3BbPJEi8BdVFMByHi+jNXrYkW3huaybV/kQ0KJg0Y6PkEMbn+zeT+i+SiKZ/HMqJGIIt4LZDqNQ==",
+      "license": "MIT"
+    },
     "node_modules/buffer-equal-constant-time": {
       "version": "1.0.1",
       "resolved": "https://registry.npmmirror.com/buffer-equal-constant-time/-/buffer-equal-constant-time-1.0.1.tgz",
diff --git a/server/package.json b/server/package.json
index aa09e28..8a4fa1a 100644
--- a/server/package.json
+++ b/server/package.json
@@ -9,6 +9,7 @@
     "db:init": "node scripts/init-db.js"
   },
   "dependencies": {
+    "bcryptjs": "^2.4.3",
     "cos-nodejs-sdk-v5": "^2.14.7",
     "dotenv": "^16.4.5",
     "jsonwebtoken": "^9.0.2",
diff --git a/server/src/lib/auth.js b/server/src/lib/auth.js
index c51b35d..e0ea7df 100644
--- a/server/src/lib/auth.js
+++ b/server/src/lib/auth.js
@@ -1,12 +1,21 @@
 const crypto = require('crypto')
 const jwt = require('jsonwebtoken')
+const bcrypt = require('bcryptjs')
 const config = require('../config')
 const { one } = require('./db')
 
-function hashPassword(password, salt) {
+function hashPasswordLegacy(password, salt) {
   return crypto.createHash('sha256').update(String(password) + ':' + salt).digest('hex')
 }
 
+function hashPassword(password) {
+  return bcrypt.hashSync(password, 10)
+}
+
+function verifyPassword(password, hash) {
+  return bcrypt.compareSync(password, hash)
+}
+
 function randomHex(bytes) {
   return crypto.randomBytes(bytes).toString('hex')
 }
@@ -49,4 +58,4 @@ async function requireAdmin(ctx) {
   }
 }
 
-module.exports = { hashPassword, randomHex, signUser, signAdmin, requireUser, requireAdmin }
+module.exports = { hashPassword, hashPasswordLegacy, verifyPassword, randomHex, signUser, signAdmin, readBearer, requireUser, requireAdmin }
diff --git a/server/src/routes/admin.js b/server/src/routes/admin.js
index 885c867..72cde46 100644
--- a/server/src/routes/admin.js
+++ b/server/src/routes/admin.js
@@ -1,6 +1,6 @@
 const { one, query, limitClause } = require('../lib/db')
 const { ok, fail } = require('../lib/response')
-const { hashPassword, signAdmin, requireAdmin } = require('../lib/auth')
+const { hashPassword, hashPasswordLegacy, verifyPassword, signAdmin, requireAdmin } = require('../lib/auth')
 const { writeLog } = require('../lib/log')
 
 function pageParams(ctx) {
@@ -14,7 +14,18 @@ function register(router) {
     const username = ctx.body.username || ''
     const password = ctx.body.password || ''
     const admin = await one('SELECT * FROM admin_accounts WHERE username = :username AND status = 1', { username })
-    if (!admin || hashPassword(password, admin.password_salt) !== admin.password_hash) return fail(1001, '用户名或密码错误')
+    if (!admin) return fail(1001, '用户名或密码错误')
+    let matched = verifyPassword(password, admin.password_hash)
+    if (!matched) {
+      // Try legacy SHA-256 verification for migration
+      if (admin.password_salt && hashPasswordLegacy(password, admin.password_salt) === admin.password_hash) {
+        // Auto-migrate to bcrypt
+        const newHash = await hashPassword(password)
+        await query('UPDATE admin_accounts SET password_hash = :password_hash, password_salt = NULL WHERE admin_id = :admin_id', { password_hash: newHash, admin_id: admin.admin_id })
+        matched = true
+      }
+    }
+    if (!matched) return fail(1001, '用户名或密码错误')
     const token = signAdmin(admin)
     await writeLog({ admin_id: admin.admin_id, action: 'admin_login', detail: '管理员登录: ' + username, ip: ctx.ip })
     return ok({ token, admin_id: String(admin.admin_id), username: admin.username, real_name: admin.real_name, role: admin.role })
diff --git a/server/src/routes/auth.js b/server/src/routes/auth.js
index 09c78c7..c1b4965 100644
--- a/server/src/routes/auth.js
+++ b/server/src/routes/auth.js
@@ -1,8 +1,10 @@
+const jwt = require('jsonwebtoken')
 const { one, query } = require('../lib/db')
 const { ok, fail } = require('../lib/response')
-const { signUser } = require('../lib/auth')
+const { signUser, readBearer } = require('../lib/auth')
 const { code2Session } = require('../lib/wechat')
 const { writeLog } = require('../lib/log')
+const config = require('../config')
 
 function register(router) {
   router.post('/api/v1/auth/login', async ctx => {
@@ -33,7 +35,43 @@ function register(router) {
   })
 
   router.post('/api/v1/auth/refresh', async ctx => {
-    return fail(2001, 'refresh_token 暂未启用，请重新登录')
+    const token = readBearer(ctx.headers)
+    if (!token) return fail(1001, 'token_expired')
+
+    let payload
+    try {
+      payload = jwt.verify(token, config.jwt.secret)
+    } catch (err) {
+      if (err.name === 'TokenExpiredError') {
+        try {
+          payload = jwt.verify(token, config.jwt.secret, { ignoreExpiration: true })
+        } catch (_) {
+          return fail(1001, 'token_expired')
+        }
+        const now = Math.floor(Date.now() / 1000)
+        const gracePeriod = 3 * 24 * 60 * 60
+        if (now - payload.exp > gracePeriod) {
+          return fail(1001, 'token_expired')
+        }
+      } else {
+        return fail(1001, 'token_expired')
+      }
+    }
+
+    if (payload.type !== 'user') return fail(1001, 'token_expired')
+
+    // Check if token is within 7 days of expiry (for non-expired tokens)
+    const now = Math.floor(Date.now() / 1000)
+    const sevenDays = 7 * 24 * 60 * 60
+    if (payload.exp && payload.exp > now && (payload.exp - now) > sevenDays) {
+      return ok({ token, expires_in: payload.exp - now })
+    }
+
+    const user = await one('SELECT * FROM users WHERE user_id = :user_id AND status = 1', { user_id: payload.user_id })
+    if (!user) return fail(1001, 'token_expired')
+
+    const newToken = signUser(user)
+    return ok({ token: newToken, expires_in: 604800 })
   })
 }
 
diff --git a/server/src/routes/treatment.js b/server/src/routes/treatment.js
index b4c5d75..08f6c8f 100644
--- a/server/src/routes/treatment.js
+++ b/server/src/routes/treatment.js
@@ -55,6 +55,14 @@ function register(router) {
     await writeLog({ user_id: user.user_id, action: 'treatment_sync', detail: '同步护理记录: ' + sessionId, ip: ctx.ip })
     return ok({ record_id: sessionId })
   })
+
+  router.get('/api/v1/treatment/:record_id', async ctx => {
+    const user = await requireUser(ctx)
+    if (!user) return fail(1001, 'invalid_token')
+    const record = await one('SELECT * FROM treatment_records WHERE session_id = :session_id AND user_id = :user_id', { session_id: ctx.params.record_id, user_id: user.user_id })
+    if (!record) return fail(1005, 'record_not_found')
+    return ok(record)
+  })
 }
 
 module.exports = register