diff --git a/src/JT1078.Protocol.Test/Extensions/JT1078PackageExtensionsTest.cs b/src/JT1078.Protocol.Test/Extensions/JT1078PackageExtensionsTest.cs
index 0033236..0290a71 100644
--- a/src/JT1078.Protocol.Test/Extensions/JT1078PackageExtensionsTest.cs
+++ b/src/JT1078.Protocol.Test/Extensions/JT1078PackageExtensionsTest.cs
@@ -1,4 +1,5 @@
-using JT1078.Protocol.Extensions;
+using JT1078.Protocol.Enums;
+using JT1078.Protocol.Extensions;
 using System;
 using System.Collections.Generic;
 using System.IO;
@@ -23,7 +24,7 @@ namespace JT1078.Protocol.Test.Extensions
                 var bytes = data[6].ToHexBytes();
                 JT1078Package package = JT1078Serializer.Deserialize(bytes);
                 mergeBodyLength += package.DataBodyLength;
-                merge = JT1078Serializer.Merge(package);
+                merge = JT1078Serializer.Merge(package,JT808ChannelType.Live);
             }
             var packages = merge.Bodies.ConvertVideo(merge.SIM, merge.LogicChannelNumber, merge.Label2.PT, merge.Label3.DataType, 
                 merge.Timestamp, merge.LastFrameInterval, merge.LastFrameInterval);
diff --git a/src/JT1078.Protocol.Test/H264/H264DecoderTest.cs b/src/JT1078.Protocol.Test/H264/H264DecoderTest.cs
index 00aa8ee..d4da921 100644
--- a/src/JT1078.Protocol.Test/H264/H264DecoderTest.cs
+++ b/src/JT1078.Protocol.Test/H264/H264DecoderTest.cs
@@ -9,6 +9,7 @@ using Newtonsoft.Json;
 using JT1078.Protocol.H264;
 using JT808.Protocol.Extensions;
 using JT1078.Protocol.MessagePack;
+using JT1078.Protocol.Enums;
 
 namespace JT1078.Protocol.Test.H264
 {
@@ -41,7 +42,7 @@ namespace JT1078.Protocol.Test.H264
                 var bytes = data[6].ToHexBytes();
                 JT1078Package package = JT1078Serializer.Deserialize(bytes);
                 mergeBodyLength += package.DataBodyLength;
-                Package = JT1078Serializer.Merge(package);
+                Package = JT1078Serializer.Merge(package,JT808ChannelType.Live);
             }
             H264Decoder decoder = new H264Decoder();
             var nalus = decoder.ParseNALU(Package);
@@ -128,7 +129,7 @@ namespace JT1078.Protocol.Test.H264
             {
                 var bytes = line.ToHexBytes();
                 JT1078Package package = JT1078Serializer.Deserialize(bytes);
-                var packageMerge = JT1078Serializer.Merge(package);
+                var packageMerge = JT1078Serializer.Merge(package,JT808ChannelType.Live);
                 if (packageMerge != null)
                 {
                     var nalus = decoder.ParseNALU(packageMerge);
diff --git a/src/JT1078.Protocol.Test/JT1078SerializerTest.cs b/src/JT1078.Protocol.Test/JT1078SerializerTest.cs
index eda06ee..30c7e5d 100644
--- a/src/JT1078.Protocol.Test/JT1078SerializerTest.cs
+++ b/src/JT1078.Protocol.Test/JT1078SerializerTest.cs
@@ -345,7 +345,7 @@ namespace JT1078.Protocol.Test
                 var bytes = data[6].ToHexBytes();
                 JT1078Package package = JT1078Serializer.Deserialize(bytes);
                 mergeBodyLength += package.DataBodyLength;
-                merge = JT1078Serializer.Merge(package);
+                merge = JT1078Serializer.Merge(package,JT808ChannelType.Live);
             }
             Assert.NotNull(merge);
             Assert.Equal(mergeBodyLength, merge.Bodies.Length);
diff --git a/src/JT1078.Protocol/Enums/JT808ChannelType.cs b/src/JT1078.Protocol/Enums/JT808ChannelType.cs
new file mode 100644
index 0000000..e3c2772
--- /dev/null
+++ b/src/JT1078.Protocol/Enums/JT808ChannelType.cs
@@ -0,0 +1,17 @@
+namespace JT1078.Protocol.Enums
+{
+    /// <summary>
+    /// data channel type
+    /// </summary>
+    public enum JT808ChannelType
+    {
+        /// <summary>
+        /// live channel
+        /// </summary>
+        Live,
+        /// <summary>
+        /// history channel
+        /// </summary>
+        History
+    }
+}
\ No newline at end of file
diff --git a/src/JT1078.Protocol/JT1078Serializer.cs b/src/JT1078.Protocol/JT1078Serializer.cs
index 819d727..18f6753 100644
--- a/src/JT1078.Protocol/JT1078Serializer.cs
+++ b/src/JT1078.Protocol/JT1078Serializer.cs
@@ -1,19 +1,19 @@
-using JT1078.Protocol.Enums;
-using JT1078.Protocol.Extensions;
-using JT1078.Protocol.MessagePack;
-using System;
+using System;
 using System.Collections.Concurrent;
-using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Text;
 using System.Text.Json;
+using JT1078.Protocol.Enums;
+using JT1078.Protocol.Extensions;
+using JT1078.Protocol.MessagePack;
 
 namespace JT1078.Protocol
 {
     public static class JT1078Serializer
     {
-        private readonly static ConcurrentDictionary<string, JT1078Package> JT1078PackageGroupDict = new ConcurrentDictionary<string, JT1078Package>(StringComparer.OrdinalIgnoreCase);
+        private readonly static ConcurrentDictionary<string, JT1078Package> livePackageGroup = new(StringComparer.OrdinalIgnoreCase);
+        private readonly static ConcurrentDictionary<string, JT1078Package> historyPackageGroup = new(StringComparer.OrdinalIgnoreCase);
         public static byte[] Serialize(JT1078Package package, int minBufferSize = 4096)
         {
             byte[] buffer = JT1078ArrayPool.Rent(minBufferSize);
@@ -72,18 +72,33 @@ namespace JT1078.Protocol
             jT1078Package.Bodies = jT1078MessagePackReader.ReadRemainArray().ToArray();
             return jT1078Package;
         }
-        public static JT1078Package Merge(JT1078Package jT1078Package)
+
+        /// <summary>
+        /// merge package
+        /// <para>due to the agreement cannot distinguish the Stream type, so need clear Stream type at the time of merger, avoid confusion</para>
+        /// </summary>
+        /// <param name="jT1078Package">package of jt1078</param>
+        /// <param name="channelType">package type is live or history</param>
+        /// <returns></returns>
+        /// <exception cref="Exception"></exception>
+        public static JT1078Package Merge(JT1078Package jT1078Package,JT808ChannelType channelType)
         {
             string cacheKey = jT1078Package.GetKey();
+            var packageGroup = channelType switch
+            {
+                JT808ChannelType.Live=>livePackageGroup,
+                JT808ChannelType.History=>historyPackageGroup,
+                _=>throw new Exception("channel type error")
+            };
             if (jT1078Package.Label3.SubpackageType == JT1078SubPackageType.分包处理时的第一个包)
             {
-                JT1078PackageGroupDict.TryRemove(cacheKey, out _);
-                JT1078PackageGroupDict.TryAdd(cacheKey, jT1078Package);
+                packageGroup.TryRemove(cacheKey, out _);
+                packageGroup.TryAdd(cacheKey, jT1078Package);
                 return default;
             }
             else if (jT1078Package.Label3.SubpackageType == JT1078SubPackageType.分包处理时的中间包)
             {
-                if (JT1078PackageGroupDict.TryGetValue(cacheKey, out var tmpPackage))
+                if (packageGroup.TryGetValue(cacheKey, out var tmpPackage))
                 {
                     var totalLength = tmpPackage.Bodies.Length + jT1078Package.Bodies.Length;
                     byte[] poolBytes = JT1078ArrayPool.Rent(totalLength);
@@ -92,13 +107,13 @@ namespace JT1078.Protocol
                     jT1078Package.Bodies.CopyTo(tmpSpan.Slice(tmpPackage.Bodies.Length));
                     tmpPackage.Bodies = tmpSpan.Slice(0, totalLength).ToArray();
                     JT1078ArrayPool.Return(poolBytes);
-                    JT1078PackageGroupDict[cacheKey] = tmpPackage;
+                    packageGroup[cacheKey] = tmpPackage;
                 }
                 return default;
             }
             else if (jT1078Package.Label3.SubpackageType == JT1078SubPackageType.分包处理时的最后一个包)
             {
-                if (JT1078PackageGroupDict.TryRemove(cacheKey, out var tmpPackage))
+                if (packageGroup.TryRemove(cacheKey, out var tmpPackage))
                 {
                     var totalLength = tmpPackage.Bodies.Length + jT1078Package.Bodies.Length;
                     byte[] poolBytes = JT1078ArrayPool.Rent(totalLength);