diff --git a/YD_AllHeartRates.Api/Mqtt/MqttBackgroundService.cs b/YD_AllHeartRates.Api/Mqtt/MqttBackgroundService.cs
index e3293cb..9e97da1 100644
--- a/YD_AllHeartRates.Api/Mqtt/MqttBackgroundService.cs
+++ b/YD_AllHeartRates.Api/Mqtt/MqttBackgroundService.cs
@@ -3,6 +3,7 @@ using Microsoft.EntityFrameworkCore;
 using MQTTnet;
 using MQTTnet.Client;
 using MQTTnet.Protocol;
+using System.Collections.Concurrent;
 using System.Globalization;
 using System.Reflection.PortableExecutable;
 using System.Runtime.CompilerServices;
@@ -108,41 +109,29 @@ namespace YD_AllHeartRates.Api.Mqtt
 
             await foreach (var batch in ReadBatchesAsync(stoppingToken))
             {
-                var heartRateEntities = new List<HeartRateData>();
-                var jumpRopeEntities = new List<JumpRopeData>();
+                var heartRateEntities = new ConcurrentBag<HeartRateData>();
+                var jumpRopeEntities = new ConcurrentBag<JumpRopeData>();
 
-                foreach (var msg in batch)
+                Parallel.ForEach(batch, msg =>
                 {
-                    if (string.IsNullOrWhiteSpace(msg.Payload)) continue;
+                    if (string.IsNullOrWhiteSpace(msg.Payload)) return;
 
-                    List<BlePayload>? list = null;
+                    BlePayload payload;
                     try
                     {
-                        var trimmed = msg.Payload.TrimStart();
-
-                        if (trimmed.StartsWith("{"))
-                        {
-                            var single = JsonSerializer.Deserialize<BlePayload>(msg.Payload, _jsonOpt);
-                            if (single != null)
-                                list = new List<BlePayload> { single };
-                        }
-                        else if (trimmed.StartsWith("["))
-                        {
-                            list = JsonSerializer.Deserialize<List<BlePayload>>(msg.Payload, _jsonOpt);
-                        }
+                        payload = JsonSerializer.Deserialize<BlePayload>(msg.Payload, _jsonOpt);
+                        if (payload == null) return;
                     }
                     catch (JsonException ex)
                     {
                         _log.LogWarning(ex, "Payload 不是合法 JSON: {Json}", msg.Payload);
-                        continue;
+                        return;
                     }
 
-                    if (list is null || list.Count == 0) continue;
+                    var heartRateList = payload.devices.Where(x => x.bs_name.Contains("GTY0")).ToList();
+                    var jumpRopeList = payload.devices.Where(x => x.bs_name.Contains("RS207")).ToList();
 
-                    var heartRateList = list.SelectMany(x => x.devices).Where(x => x.bs_name.Contains("GTY0")).ToList();
-                    var jumpRopeList = list.SelectMany(x => x.devices).Where(x => x.bs_name.Contains("RS207")).ToList();
-
-                    var scoreTime = DateTime.ParseExact(list.Select(x => x.send_time).First(), "yyyy-MM-dd HH:mm:ss", CultureInfo.InvariantCulture);
+                    var scoreTime = DateTime.ParseExact(payload.send_time, "yyyy-MM-dd HH:mm:ss", CultureInfo.InvariantCulture);
 
                     foreach (var ble in heartRateList)
                     {
@@ -291,7 +280,7 @@ namespace YD_AllHeartRates.Api.Mqtt
 
                         //RedisHelper.SAdd(studentSetKey, student.StudentNo);
                     }
-                }
+                });
 
                 // 心率每分钟保存一次
                 if ((DateTime.Now - _lastHeartRateSaveTime).TotalSeconds >= 60 && _pendingHeartRates.Any())
diff --git a/YD_AllHeartRates.Api/appsettings.json b/YD_AllHeartRates.Api/appsettings.json
index 5948be5..ab124e3 100644
--- a/YD_AllHeartRates.Api/appsettings.json
+++ b/YD_AllHeartRates.Api/appsettings.json
@@ -43,6 +43,6 @@
     "Host": "8.153.108.90",
     "Port": 1883,
     "Topic": "heartrates/topic",
-    "BatchSize": 1
+    "BatchSize": 10
   }
 }
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 2d6f612..06fee2e 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+e2e455beb818072bf47a3f72e7c28aee0d81f2f6")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+ac45401a00234bcfe5b0bc7e4b43ab7a3e737f16")]
 [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 4c45eb7..a836081 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 @@
-24a647519bb5c818af84137d9f158bd3c8bb26dee151c991a4a8d9432822805b
+2a88393a86ca30e91023931fadfc25c17abd0bd7e8685dbc1401c11194e83ca9
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 ca19834..dc992dc 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 3826b19..e6ec14d 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/apphost.exe b/YD_AllHeartRates.Api/obj/Debug/net6.0/apphost.exe
index 77e2e81..d280ab7 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 2b15cb1..c43a069 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 2b15cb1..c43a069 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