diff --git a/YD_AllHeartRates.Api/Mqtt/MqttBackgroundService.cs b/YD_AllHeartRates.Api/Mqtt/MqttBackgroundService.cs
index 20867da..d9a8a24 100644
--- a/YD_AllHeartRates.Api/Mqtt/MqttBackgroundService.cs
+++ b/YD_AllHeartRates.Api/Mqtt/MqttBackgroundService.cs
@@ -34,8 +34,6 @@ namespace YD_AllHeartRates.Api.Mqtt
         private readonly ICaching _caching;
         private readonly IServiceScopeFactory _scopeFactory;
 
-        private readonly List<StudentDto> _studentList = new();
-        private readonly List<S_Device> _devices = new();
         private readonly List<HeartRateData> _pendingHeartRates = new();
 
         private DateTime _lastHeartRateSaveTime = DateTime.Now;
@@ -60,28 +58,6 @@ namespace YD_AllHeartRates.Api.Mqtt
             _smartSportsContext = smartSportsContext;
             _caching = caching;
             _scopeFactory = scopeFactory;
-
-            _studentList = (from d in _smartSportsContext.Device
-                            join s in _smartSportsContext.Student on d.StudentNo equals s.StudentNo
-                            join c in _smartSportsContext.Class on s.ClassId equals c.Id
-                            where s.StudentStatus == 1
-                            select new StudentDto
-                            {
-                                SchoolCode = s.SchoolCode,
-                                StudentNo = s.StudentNo,
-                                StudentName = s.StudentName,
-                                Sex = s.Sex,
-                                Age = s.Age,
-                                HeartRateId = d.Code,
-                                JumpRopeId = d.Code,
-                                ClassId = s.ClassId,
-                                ClassName = s.ClassName,
-                                GradeId = c.GradeId,
-                                GradeName = c.GradeName ?? "",
-                                DeviceType = d.DeviceType,
-                            }).ToList();
-
-            _devices = _smartSportsContext.Device.ToList();
         }
 
         protected override async Task ExecuteAsync(CancellationToken stoppingToken)
@@ -110,13 +86,47 @@ namespace YD_AllHeartRates.Api.Mqtt
 
             await foreach (var batch in ReadBatchesAsync(stoppingToken))
             {
+                List<StudentDto> studentList;
+                List<S_Device> devices;
+
+                studentList = _caching.Get<List<StudentDto>>(AppSettings.StudentListCacheKey);
+                devices = _caching.Get<List<S_Device>>(AppSettings.DeviceListCacheKey);
+
+                if (studentList == null || devices == null)
+                {
+                    studentList = (from d in _smartSportsContext.Device
+                                   join s in _smartSportsContext.Student on d.StudentNo equals s.StudentNo
+                                   join c in _smartSportsContext.Class on s.ClassId equals c.Id
+                                   where s.StudentStatus == 1
+                                   select new StudentDto
+                                   {
+                                       SchoolCode = s.SchoolCode,
+                                       StudentNo = s.StudentNo,
+                                       StudentName = s.StudentName,
+                                       Sex = s.Sex,
+                                       Age = s.Age,
+                                       HeartRateId = d.Code,
+                                       JumpRopeId = d.Code,
+                                       ClassId = s.ClassId,
+                                       ClassName = s.ClassName,
+                                       GradeId = c.GradeId,
+                                       GradeName = c.GradeName ?? "",
+                                       DeviceType = d.DeviceType,
+                                   }).ToList();
+
+                    devices = _smartSportsContext.Device.ToList();
+
+                    _caching.AddObject(AppSettings.StudentListCacheKey, studentList, 28800);
+                    _caching.AddObject(AppSettings.DeviceListCacheKey, devices, 28800);
+                }
+
                 var heartRateEntities = new ConcurrentBag<HeartRateData>();
                 var jumpRopeEntities = new ConcurrentBag<JumpRopeData>();
 
-                var deviceHMap = _devices.Where(x => x.DeviceType == 1).ToDictionary(x => x.Code, x => x.StudentNo);
-                var deviceJMap = _devices.Where(x => x.DeviceType == 2).ToDictionary(x => x.Code, x => x.StudentNo);
+                var deviceHMap = devices.Where(x => x.DeviceType == 1).ToDictionary(x => x.Code, x => x.StudentNo);
+                var deviceJMap = devices.Where(x => x.DeviceType == 2).ToDictionary(x => x.Code, x => x.StudentNo);
 
-                var studentMap = _studentList.GroupBy(x => x.StudentNo).ToDictionary(g => g.Key, g => g.First());
+                var studentMap = studentList.GroupBy(x => x.StudentNo).ToDictionary(g => g.Key, g => g.First());
 
                 Parallel.ForEach(batch, new ParallelOptions { MaxDegreeOfParallelism = Environment.ProcessorCount }, msg =>
                 {
diff --git a/YD_AllHeartRates.Api/Services/Impl/DeviceService.cs b/YD_AllHeartRates.Api/Services/Impl/DeviceService.cs
index 9d7946f..88ef837 100644
--- a/YD_AllHeartRates.Api/Services/Impl/DeviceService.cs
+++ b/YD_AllHeartRates.Api/Services/Impl/DeviceService.cs
@@ -12,6 +12,7 @@ using YD_AllHeartRates.Api.Utilities;
 using YD_AllHeartRates.Commons.Dto;
 using YD_AllHeartRates.Commons.Dto.Device;
 using YD_AllHeartRates.Commons.Dto.LargeScreen;
+using YD_AllHeartRates.Commons.MemoryCaches;
 
 namespace YD_AllHeartRates.Api.Services.Impl
 {
@@ -24,15 +25,17 @@ namespace YD_AllHeartRates.Api.Services.Impl
         public UserContext _userContext;
         private readonly LoginContext _loginContext;
         private string schoolCode;
+        private readonly ICaching _caching;
 
         /// <summary>
         /// 构造
         /// </summary>
-        public DeviceService(SmartSportsContext sportsContext, UserContext userContext, LoginContext loginContext)
+        public DeviceService(SmartSportsContext sportsContext, UserContext userContext, LoginContext loginContext, ICaching caching)
         {
             _sportsContext = sportsContext;
             _userContext = userContext;
             _loginContext = loginContext;
+            _caching = caching;
 
             schoolCode = _loginContext.SchoolCode;
         }
@@ -169,7 +172,14 @@ namespace YD_AllHeartRates.Api.Services.Impl
             };
 
             await _sportsContext.AddAsync(entity);
-            return await _sportsContext.SaveChangesAsync() > 0;
+            var res = await _sportsContext.SaveChangesAsync() > 0;
+
+            if (res)
+            {
+                _caching.Remove(AppSettings.DeviceListCacheKey);
+                return true;
+            }
+            return false;
         }
 
         /// <summary>
@@ -198,7 +208,14 @@ namespace YD_AllHeartRates.Api.Services.Impl
             device.Name = dto.DeviceType == 1 ? "心率设备" : "跳绳设备";
 
             _sportsContext.Update(device);
-            return await _sportsContext.SaveChangesAsync() > 0;
+            var res = await _sportsContext.SaveChangesAsync() > 0;
+
+            if (res)
+            {
+                _caching.Remove(AppSettings.DeviceListCacheKey);
+                return true;
+            }
+            return false;
         }
 
         /// <summary>
@@ -214,7 +231,14 @@ namespace YD_AllHeartRates.Api.Services.Impl
                 throw new Exception("更新的设备不存在");
 
             _sportsContext.Device.Remove(device);
-            return await _sportsContext.SaveChangesAsync() > 0;
+            var res = await _sportsContext.SaveChangesAsync() > 0;
+
+            if (res)
+            {
+                _caching.Remove(AppSettings.DeviceListCacheKey);
+                return true;
+            }
+            return false;
         }
 
         /// <summary>
diff --git a/YD_AllHeartRates.Api/Utilities/AppSettings.cs b/YD_AllHeartRates.Api/Utilities/AppSettings.cs
index b026931..b4f1cdb 100644
--- a/YD_AllHeartRates.Api/Utilities/AppSettings.cs
+++ b/YD_AllHeartRates.Api/Utilities/AppSettings.cs
@@ -14,6 +14,8 @@
         public static string[] CorsUrls { get; set; }
         public static MqttConfig Mqtt { get; set; }
 
+        public static string StudentListCacheKey = "student_list";
+        public static string DeviceListCacheKey = "device_list";
         public static void Init(IConfiguration configuration)
         {
             Logging = configuration.GetSection("Logging").Get<LoggingConfig>();
diff --git a/YD_AllHeartRates.Api/XS.cs b/YD_AllHeartRates.Api/XS.cs
index 6668b7d..e72cc86 100644
--- a/YD_AllHeartRates.Api/XS.cs
+++ b/YD_AllHeartRates.Api/XS.cs
@@ -5,6 +5,7 @@
         /*
         「」
         
+
         
 
 
diff --git a/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.AssemblyInfo.cs b/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.AssemblyInfo.cs
index 9458177..7984990 100644
--- a/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.AssemblyInfo.cs
+++ b/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.AssemblyInfo.cs
@@ -14,7 +14,7 @@ using System.Reflection;
 [assembly: System.Reflection.AssemblyCompanyAttribute("YD_AllHeartRates.Api")]
 [assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
 [assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
-[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+c01227dcc153e3533d4428f5edc7c1f1bf5bf552")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+7b9f68a3083ca4505691f4f83599da73c25dca89")]
 [assembly: System.Reflection.AssemblyProductAttribute("YD_AllHeartRates.Api")]
 [assembly: System.Reflection.AssemblyTitleAttribute("YD_AllHeartRates.Api")]
 [assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
diff --git a/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.AssemblyInfoInputs.cache b/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.AssemblyInfoInputs.cache
index c3e37e0..d08631d 100644
--- a/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.AssemblyInfoInputs.cache
+++ b/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.AssemblyInfoInputs.cache
@@ -1 +1 @@
-6784db23a965b9ae2a3dfdaab50ae94c643a7dee1fcca8b9d9cb873fd2636867
+3e3817ef6a7d7531bf57358bb5d2abdf866abc385932c9d17d07e9797a04f620
diff --git a/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.csproj.AssemblyReference.cache b/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.csproj.AssemblyReference.cache
index 2bbad4a..f77fa8b 100644
Binary files a/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.csproj.AssemblyReference.cache and b/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.csproj.AssemblyReference.cache differ
diff --git a/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.dll b/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.dll
index 2341820..c60e559 100644
Binary files a/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.dll and b/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.dll differ
diff --git a/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.pdb b/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.pdb
index 22f2f5e..2be4050 100644
Binary files a/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.pdb and b/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.pdb differ
diff --git a/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.xml b/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.xml
index e515709..c8469a4 100644
--- a/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.xml
+++ b/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.xml
@@ -436,7 +436,7 @@
             服务实现
             </summary>
         </member>
-        <member name="M:YD_AllHeartRates.Api.Services.Impl.DeviceService.#ctor(YD_AllHeartRates.Api.Context.SmartSportsContext,YD_AllHeartRates.Api.Context.UserContext,YD_AllHeartRates.Api.Utilities.LoginContext)">
+        <member name="M:YD_AllHeartRates.Api.Services.Impl.DeviceService.#ctor(YD_AllHeartRates.Api.Context.SmartSportsContext,YD_AllHeartRates.Api.Context.UserContext,YD_AllHeartRates.Api.Utilities.LoginContext,YD_AllHeartRates.Commons.MemoryCaches.ICaching)">
             <summary>
             构造
             </summary>
diff --git a/YD_AllHeartRates.Api/obj/Debug/net6.0/apphost.exe b/YD_AllHeartRates.Api/obj/Debug/net6.0/apphost.exe
index a3e9d8f..2374636 100644
Binary files a/YD_AllHeartRates.Api/obj/Debug/net6.0/apphost.exe and b/YD_AllHeartRates.Api/obj/Debug/net6.0/apphost.exe differ
diff --git a/YD_AllHeartRates.Api/obj/Debug/net6.0/ref/YD_AllHeartRates.Api.dll b/YD_AllHeartRates.Api/obj/Debug/net6.0/ref/YD_AllHeartRates.Api.dll
index c3d6ddd..b55c6dc 100644
Binary files a/YD_AllHeartRates.Api/obj/Debug/net6.0/ref/YD_AllHeartRates.Api.dll and b/YD_AllHeartRates.Api/obj/Debug/net6.0/ref/YD_AllHeartRates.Api.dll differ
diff --git a/YD_AllHeartRates.Api/obj/Debug/net6.0/refint/YD_AllHeartRates.Api.dll b/YD_AllHeartRates.Api/obj/Debug/net6.0/refint/YD_AllHeartRates.Api.dll
index c3d6ddd..b55c6dc 100644
Binary files a/YD_AllHeartRates.Api/obj/Debug/net6.0/refint/YD_AllHeartRates.Api.dll and b/YD_AllHeartRates.Api/obj/Debug/net6.0/refint/YD_AllHeartRates.Api.dll differ
diff --git a/YD_AllHeartRates.Commons/bin/Debug/net6.0/YD_AllHeartRates.Commons.dll b/YD_AllHeartRates.Commons/bin/Debug/net6.0/YD_AllHeartRates.Commons.dll
index 61c0381..6dfe1af 100644
Binary files a/YD_AllHeartRates.Commons/bin/Debug/net6.0/YD_AllHeartRates.Commons.dll and b/YD_AllHeartRates.Commons/bin/Debug/net6.0/YD_AllHeartRates.Commons.dll differ
diff --git a/YD_AllHeartRates.Commons/bin/Debug/net6.0/YD_AllHeartRates.Commons.pdb b/YD_AllHeartRates.Commons/bin/Debug/net6.0/YD_AllHeartRates.Commons.pdb
index dbb6281..f45bb85 100644
Binary files a/YD_AllHeartRates.Commons/bin/Debug/net6.0/YD_AllHeartRates.Commons.pdb and b/YD_AllHeartRates.Commons/bin/Debug/net6.0/YD_AllHeartRates.Commons.pdb differ
diff --git a/YD_AllHeartRates.Commons/obj/Debug/net6.0/YD_AllHeartRates.Commons.AssemblyInfo.cs b/YD_AllHeartRates.Commons/obj/Debug/net6.0/YD_AllHeartRates.Commons.AssemblyInfo.cs
index 026b282..6a01eb6 100644
--- a/YD_AllHeartRates.Commons/obj/Debug/net6.0/YD_AllHeartRates.Commons.AssemblyInfo.cs
+++ b/YD_AllHeartRates.Commons/obj/Debug/net6.0/YD_AllHeartRates.Commons.AssemblyInfo.cs
@@ -14,7 +14,7 @@ using System.Reflection;
 [assembly: System.Reflection.AssemblyCompanyAttribute("YD_AllHeartRates.Commons")]
 [assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
 [assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
-[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+c01227dcc153e3533d4428f5edc7c1f1bf5bf552")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+7b9f68a3083ca4505691f4f83599da73c25dca89")]
 [assembly: System.Reflection.AssemblyProductAttribute("YD_AllHeartRates.Commons")]
 [assembly: System.Reflection.AssemblyTitleAttribute("YD_AllHeartRates.Commons")]
 [assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
diff --git a/YD_AllHeartRates.Commons/obj/Debug/net6.0/YD_AllHeartRates.Commons.AssemblyInfoInputs.cache b/YD_AllHeartRates.Commons/obj/Debug/net6.0/YD_AllHeartRates.Commons.AssemblyInfoInputs.cache
index 10bdd2c..8864dc7 100644
--- a/YD_AllHeartRates.Commons/obj/Debug/net6.0/YD_AllHeartRates.Commons.AssemblyInfoInputs.cache
+++ b/YD_AllHeartRates.Commons/obj/Debug/net6.0/YD_AllHeartRates.Commons.AssemblyInfoInputs.cache
@@ -1 +1 @@
-463029ebc318895442edb6fb3984092082e0f3a1f95e6c3cf59e09e021c6eec2
+a15d75618d9a5f604592ebd59e64d2979ec0365ce6479e8233cedcc51f5c89ef
diff --git a/YD_AllHeartRates.Commons/obj/Debug/net6.0/YD_AllHeartRates.Commons.dll b/YD_AllHeartRates.Commons/obj/Debug/net6.0/YD_AllHeartRates.Commons.dll
index 61c0381..6dfe1af 100644
Binary files a/YD_AllHeartRates.Commons/obj/Debug/net6.0/YD_AllHeartRates.Commons.dll and b/YD_AllHeartRates.Commons/obj/Debug/net6.0/YD_AllHeartRates.Commons.dll differ
diff --git a/YD_AllHeartRates.Commons/obj/Debug/net6.0/YD_AllHeartRates.Commons.pdb b/YD_AllHeartRates.Commons/obj/Debug/net6.0/YD_AllHeartRates.Commons.pdb
index dbb6281..f45bb85 100644
Binary files a/YD_AllHeartRates.Commons/obj/Debug/net6.0/YD_AllHeartRates.Commons.pdb and b/YD_AllHeartRates.Commons/obj/Debug/net6.0/YD_AllHeartRates.Commons.pdb differ
diff --git a/YD_AllHeartRates.Commons/obj/Debug/net6.0/ref/YD_AllHeartRates.Commons.dll b/YD_AllHeartRates.Commons/obj/Debug/net6.0/ref/YD_AllHeartRates.Commons.dll
index 18bcd17..600e518 100644
Binary files a/YD_AllHeartRates.Commons/obj/Debug/net6.0/ref/YD_AllHeartRates.Commons.dll and b/YD_AllHeartRates.Commons/obj/Debug/net6.0/ref/YD_AllHeartRates.Commons.dll differ
diff --git a/YD_AllHeartRates.Commons/obj/Debug/net6.0/refint/YD_AllHeartRates.Commons.dll b/YD_AllHeartRates.Commons/obj/Debug/net6.0/refint/YD_AllHeartRates.Commons.dll
index 18bcd17..600e518 100644
Binary files a/YD_AllHeartRates.Commons/obj/Debug/net6.0/refint/YD_AllHeartRates.Commons.dll and b/YD_AllHeartRates.Commons/obj/Debug/net6.0/refint/YD_AllHeartRates.Commons.dll differ