diff --git a/README.md b/README.md
index 866c61d..54696e1 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
 
 > 该JT809协议是参考[MessagePack-CSharp](https://github.com/neuecc/MessagePack-CSharp)一款二进制序列化器，站在巨人的肩膀上搬砖就是爽歪歪。
 
-## JT809终端通讯协议消息对照表
+## JT809协议消息对照表
 
 |序号|消息ID|完成情况|消息体名称|
 |:------:|:------:|:------:|:------:|
@@ -17,5 +17,14 @@
 |  5   | 0x1005  |  √	|	主链路连接保持请求消息  |
 |  6   | 0x1006  |  √	|	主链路连接保持应答消息  |
 |  7   | 0x1007  |  √	|	主链路断开通知消息  |
+|  8   | 0x1008  |  √	|	下级平台主动关闭链路通知消息  |
+|  9   | 0x9001  |  √	|	从链路连接请求消息  |
+|  10  | 0x9002  |  √	|	从链路连接应答消息  |
+|  11  | 0x9003  |  √	|	从链路注销请求消息  |
+|  12  | 0x9004  |  √	|	从链路注销应答消息  |
+
+
+
+
 
 
diff --git a/src/JT809.Protocol.Test/JT809MessageBody/JT809_0x1008Test.cs b/src/JT809.Protocol.Test/JT809MessageBody/JT809_0x1008Test.cs
new file mode 100644
index 0000000..ce6b7a6
--- /dev/null
+++ b/src/JT809.Protocol.Test/JT809MessageBody/JT809_0x1008Test.cs
@@ -0,0 +1,30 @@
+using JT809.Protocol;
+using JT809.Protocol.JT809Extensions;
+using JT809.Protocol.JT809MessageBody;
+using JT809.Protocol.JT809Exceptions;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Xunit;
+
+namespace JT809.Protocol.Test.JT809MessageBody
+{
+   public class JT809_0x1008Test
+    {
+        [Fact]
+        public void Test1()
+        {
+            JT809_0x1008 jT809_0X1008 = new JT809_0x1008();
+            jT809_0X1008.ReasonCode = JT809Enums.JT809_0x1008_ReasonCode.网关重启;
+            var hex = JT809Serializer.Serialize(jT809_0X1008).ToHexString();
+        }
+
+        [Fact]
+        public void Test2()
+        {
+            var bytes = "00".ToHexBytes();
+            JT809_0x1008 jT809_0X1008 = JT809Serializer.Deserialize<JT809_0x1008>(bytes);
+            Assert.Equal(JT809Enums.JT809_0x1008_ReasonCode.网关重启, jT809_0X1008.ReasonCode);
+        }
+    }
+}
diff --git a/src/JT809.Protocol.Test/JT809MessageBody/JT809_0x9001Test.cs b/src/JT809.Protocol.Test/JT809MessageBody/JT809_0x9001Test.cs
new file mode 100644
index 0000000..638cd2e
--- /dev/null
+++ b/src/JT809.Protocol.Test/JT809MessageBody/JT809_0x9001Test.cs
@@ -0,0 +1,30 @@
+using JT809.Protocol;
+using JT809.Protocol.JT809Extensions;
+using JT809.Protocol.JT809MessageBody;
+using JT809.Protocol.JT809Exceptions;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Xunit;
+
+namespace JT809.Protocol.Test.JT809MessageBody
+{
+    public class JT809_0x9001Test
+    {
+        [Fact]
+        public void Test1()
+        {
+            JT809_0x9001 jT809_0X9001 = new JT809_0x9001();
+            jT809_0X9001.VerifyCode = 45454;
+            var hex = JT809Serializer.Serialize(jT809_0X9001).ToHexString();
+        }
+
+        [Fact]
+        public void Test2()
+        {
+            var bytes = "00 00 B1 8E".ToHexBytes();
+            JT809_0x9001 jT809_0X9001 = JT809Serializer.Deserialize<JT809_0x9001>(bytes);
+            Assert.Equal((uint)45454, jT809_0X9001.VerifyCode);
+        }
+    }
+}
diff --git a/src/JT809.Protocol.Test/JT809MessageBody/JT809_0x9002Test.cs b/src/JT809.Protocol.Test/JT809MessageBody/JT809_0x9002Test.cs
new file mode 100644
index 0000000..ca5753d
--- /dev/null
+++ b/src/JT809.Protocol.Test/JT809MessageBody/JT809_0x9002Test.cs
@@ -0,0 +1,30 @@
+using JT809.Protocol;
+using JT809.Protocol.JT809Extensions;
+using JT809.Protocol.JT809MessageBody;
+using JT809.Protocol.JT809Exceptions;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Xunit;
+
+namespace JT809.Protocol.Test.JT809MessageBody
+{
+    public class JT809_0x9002Test
+    {
+        [Fact]
+        public void Test1()
+        {
+            JT809_0x9002 jT809_0X9002 = new JT809_0x9002();
+            jT809_0X9002.Result =  JT809Enums.JT809_0x9002_Result.成功;
+            var hex = JT809Serializer.Serialize(jT809_0X9002).ToHexString();
+        }
+
+        [Fact]
+        public void Test2()
+        {
+            var bytes = "00".ToHexBytes();
+            JT809_0x9002 jT809_0X9002 = JT809Serializer.Deserialize<JT809_0x9002>(bytes);
+            Assert.Equal(JT809Enums.JT809_0x9002_Result.成功, jT809_0X9002.Result);
+        }
+    }
+}
diff --git a/src/JT809.Protocol.Test/JT809MessageBody/JT809_0x9003Test.cs b/src/JT809.Protocol.Test/JT809MessageBody/JT809_0x9003Test.cs
new file mode 100644
index 0000000..e296e6f
--- /dev/null
+++ b/src/JT809.Protocol.Test/JT809MessageBody/JT809_0x9003Test.cs
@@ -0,0 +1,30 @@
+using JT809.Protocol;
+using JT809.Protocol.JT809Extensions;
+using JT809.Protocol.JT809MessageBody;
+using JT809.Protocol.JT809Exceptions;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Xunit;
+
+namespace JT809.Protocol.Test.JT809MessageBody
+{
+    public class JT809_0x9003Test
+    {
+        [Fact]
+        public void Test1()
+        {
+            JT809_0x9003 jT809_0X9003 = new JT809_0x9003();
+            jT809_0X9003.VerifyCode = 45454;
+            var hex = JT809Serializer.Serialize(jT809_0X9003).ToHexString();
+        }
+
+        [Fact]
+        public void Test2()
+        {
+            var bytes = "00 00 B1 8E".ToHexBytes();
+            JT809_0x9003 jT809_0X9003 = JT809Serializer.Deserialize<JT809_0x9003>(bytes);
+            Assert.Equal((uint)45454, jT809_0X9003.VerifyCode);
+        }
+    }
+}
diff --git a/src/JT809.Protocol/JT809.Protocol.csproj b/src/JT809.Protocol/JT809.Protocol.csproj
index b626434..97b0a72 100644
--- a/src/JT809.Protocol/JT809.Protocol.csproj
+++ b/src/JT809.Protocol/JT809.Protocol.csproj
@@ -39,6 +39,8 @@
     <Compile Include="JT809Enums\JT809SubBusinessType.cs" />
     <Compile Include="JT809Enums\JT809_0x1002_Result.cs" />
     <Compile Include="JT809Enums\JT809_0x1007_ErrorCode.cs" />
+    <Compile Include="JT809Enums\JT809_0x1008_ReasonCode.cs" />
+    <Compile Include="JT809Enums\JT809_0x9002_Result.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/JT809.Protocol/JT809Enums/JT809BusinessType.cs b/src/JT809.Protocol/JT809Enums/JT809BusinessType.cs
index 7177351..6bfb32c 100644
--- a/src/JT809.Protocol/JT809Enums/JT809BusinessType.cs
+++ b/src/JT809.Protocol/JT809Enums/JT809BusinessType.cs
@@ -59,26 +59,31 @@ namespace JT809.Protocol.JT809Enums
         ///下级平台主动关闭链路通知消息  
         ///</summary>
         [Description("下级平台主动关闭链路通知消息")]
+        [JT809BodiesType(typeof(JT809_0x1008))]
         UP_CLOSELINK_INFORM = 0x1008,
         ///<summary>
         ///从链路连接请求消息  
         ///</summary>
         [Description("从链路连接请求消息")]
+        [JT809BodiesType(typeof(JT809_0x9001))]
         DOWN_CONNECT_REQ = 0x9001,
         ///<summary>
         ///从链路连接应答消息  
         ///</summary>
         [Description("从链路连接应答消息")]
+        [JT809BodiesType(typeof(JT809_0x9002))]
         DOWN_CONNECT_RSP = 0x9002,
         ///<summary>
         ///从链路注销请求消息  
         ///</summary>
         [Description("从链路注销请求消息")]
+        [JT809BodiesType(typeof(JT809_0x9003))]
         DOWN_DISCONNECT_REQ = 0x9003,
         ///<summary>
         ///从链路注销应答消息  
         ///</summary>
         [Description("从链路注销应答消息")]
+        [JT809BodiesType(typeof(JT809_0x9004))]
         DOWN_DISCONNECT_RSP = 0x9004,
         ///<summary>
         ///从链路连接保持请求消息  
diff --git a/src/JT809.Protocol/JT809Enums/JT809_0x1008_ReasonCode.cs b/src/JT809.Protocol/JT809Enums/JT809_0x1008_ReasonCode.cs
new file mode 100644
index 0000000..523a8fd
--- /dev/null
+++ b/src/JT809.Protocol/JT809Enums/JT809_0x1008_ReasonCode.cs
@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace JT809.Protocol.JT809Enums
+{
+    /// <summary>
+    /// 错误代码
+    /// </summary>
+    public enum JT809_0x1008_ReasonCode:byte
+    {
+        网关重启=0x00,
+        其他原因=0x01
+    }
+}
diff --git a/src/JT809.Protocol/JT809Enums/JT809_0x9002_Result.cs b/src/JT809.Protocol/JT809Enums/JT809_0x9002_Result.cs
new file mode 100644
index 0000000..cd985ab
--- /dev/null
+++ b/src/JT809.Protocol/JT809Enums/JT809_0x9002_Result.cs
@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace JT809.Protocol.JT809Enums
+{
+    /// <summary>
+    /// 验证结果
+    /// </summary>
+    public enum JT809_0x9002_Result:byte
+    {
+        成功=0x00,
+        VERIFY_CODE错误= 0x01,
+        资源紧张_稍后再连接_已经占用= 0x02,
+        其他= 0x03
+    }
+}
diff --git a/src/JT809.Protocol/JT809Formatters/JT809MessageBodyFormatters/JT809_0x1008Formatter.cs b/src/JT809.Protocol/JT809Formatters/JT809MessageBodyFormatters/JT809_0x1008Formatter.cs
new file mode 100644
index 0000000..7a77ff0
--- /dev/null
+++ b/src/JT809.Protocol/JT809Formatters/JT809MessageBodyFormatters/JT809_0x1008Formatter.cs
@@ -0,0 +1,27 @@
+using JT809.Protocol.JT809Extensions;
+using JT809.Protocol.JT809MessageBody;
+using System;
+using System.Buffers;
+using System.Collections.Generic;
+using System.Text;
+
+namespace JT809.Protocol.JT809Formatters.JT809MessageBodyFormatters
+{
+    public class JT809_0x1008Formatter : IJT809Formatter<JT809_0x1008>
+    {
+        public JT809_0x1008 Deserialize(ReadOnlySpan<byte> bytes, out int readSize)
+        {
+            int offset = 0;
+            JT809_0x1008 jT809_0X1008 = new JT809_0x1008();
+            jT809_0X1008.ReasonCode =  (JT809Enums.JT809_0x1008_ReasonCode)JT809BinaryExtensions.ReadByteLittle(bytes, ref offset);
+            readSize = offset;
+            return jT809_0X1008;
+        }
+
+        public int Serialize(IMemoryOwner<byte> memoryOwner, int offset, JT809_0x1008 value)
+        {
+            offset += JT809BinaryExtensions.WriteByteLittle(memoryOwner, offset, (byte)value.ReasonCode);
+            return offset;
+        }
+    }
+}
diff --git a/src/JT809.Protocol/JT809Formatters/JT809MessageBodyFormatters/JT809_0x9001Formatter.cs b/src/JT809.Protocol/JT809Formatters/JT809MessageBodyFormatters/JT809_0x9001Formatter.cs
new file mode 100644
index 0000000..75d5f37
--- /dev/null
+++ b/src/JT809.Protocol/JT809Formatters/JT809MessageBodyFormatters/JT809_0x9001Formatter.cs
@@ -0,0 +1,27 @@
+using JT809.Protocol.JT809Extensions;
+using JT809.Protocol.JT809MessageBody;
+using System;
+using System.Buffers;
+using System.Collections.Generic;
+using System.Text;
+
+namespace JT809.Protocol.JT809Formatters.JT809MessageBodyFormatters
+{
+    public class JT809_0x9001Formatter : IJT809Formatter<JT809_0x9001>
+    {
+        public JT809_0x9001 Deserialize(ReadOnlySpan<byte> bytes, out int readSize)
+        {
+            int offset = 0;
+            JT809_0x9001 jT809_0X9001 = new JT809_0x9001();
+            jT809_0X9001.VerifyCode = JT809BinaryExtensions.ReadUInt32Little(bytes, ref offset);
+            readSize = offset;
+            return jT809_0X9001;
+        }
+
+        public int Serialize(IMemoryOwner<byte> memoryOwner, int offset, JT809_0x9001 value)
+        {
+            offset += JT809BinaryExtensions.WriteUInt32Little(memoryOwner, offset, value.VerifyCode);
+            return offset;
+        }
+    }
+}
diff --git a/src/JT809.Protocol/JT809Formatters/JT809MessageBodyFormatters/JT809_0x9002Formatter.cs b/src/JT809.Protocol/JT809Formatters/JT809MessageBodyFormatters/JT809_0x9002Formatter.cs
new file mode 100644
index 0000000..926faa6
--- /dev/null
+++ b/src/JT809.Protocol/JT809Formatters/JT809MessageBodyFormatters/JT809_0x9002Formatter.cs
@@ -0,0 +1,28 @@
+using JT809.Protocol.JT809Enums;
+using JT809.Protocol.JT809Extensions;
+using JT809.Protocol.JT809MessageBody;
+using System;
+using System.Buffers;
+using System.Collections.Generic;
+using System.Text;
+
+namespace JT809.Protocol.JT809Formatters.JT809MessageBodyFormatters
+{
+    public class JT809_0x9002Formatter : IJT809Formatter<JT809_0x9002>
+    {
+        public JT809_0x9002 Deserialize(ReadOnlySpan<byte> bytes, out int readSize)
+        {
+            int offset = 0;
+            JT809_0x9002 jT809_0X9002 = new JT809_0x9002();
+            jT809_0X9002.Result = (JT809_0x9002_Result)JT809BinaryExtensions.ReadByteLittle(bytes, ref offset);
+            readSize = offset;
+            return jT809_0X9002;
+        }
+
+        public int Serialize(IMemoryOwner<byte> memoryOwner, int offset, JT809_0x9002 value)
+        {
+            offset += JT809BinaryExtensions.WriteByteLittle(memoryOwner, offset, (byte)value.Result);
+            return offset;
+        }
+    }
+}
diff --git a/src/JT809.Protocol/JT809Formatters/JT809MessageBodyFormatters/JT809_0x9003Formatter.cs b/src/JT809.Protocol/JT809Formatters/JT809MessageBodyFormatters/JT809_0x9003Formatter.cs
new file mode 100644
index 0000000..7a1830a
--- /dev/null
+++ b/src/JT809.Protocol/JT809Formatters/JT809MessageBodyFormatters/JT809_0x9003Formatter.cs
@@ -0,0 +1,27 @@
+using JT809.Protocol.JT809Extensions;
+using JT809.Protocol.JT809MessageBody;
+using System;
+using System.Buffers;
+using System.Collections.Generic;
+using System.Text;
+
+namespace JT809.Protocol.JT809Formatters.JT809MessageBodyFormatters
+{
+    public class JT809_0x9003Formatter : IJT809Formatter<JT809_0x9003>
+    {
+        public JT809_0x9003 Deserialize(ReadOnlySpan<byte> bytes, out int readSize)
+        {
+            int offset = 0;
+            JT809_0x9003 jT809_0X9003 = new JT809_0x9003();
+            jT809_0X9003.VerifyCode = (JT809BinaryExtensions.ReadUInt32Little(bytes, ref offset));
+            readSize = offset;
+            return jT809_0X9003;
+        }
+
+        public int Serialize(IMemoryOwner<byte> memoryOwner, int offset, JT809_0x9003 value)
+        {
+            offset += JT809BinaryExtensions.WriteUInt32Little(memoryOwner, offset, value.VerifyCode);
+            return offset;
+        }
+    }
+}
diff --git a/src/JT809.Protocol/JT809MessageBody/JT809_0x1008.cs b/src/JT809.Protocol/JT809MessageBody/JT809_0x1008.cs
new file mode 100644
index 0000000..e10991f
--- /dev/null
+++ b/src/JT809.Protocol/JT809MessageBody/JT809_0x1008.cs
@@ -0,0 +1,25 @@
+using JT809.Protocol.JT809Attributes;
+using JT809.Protocol.JT809Enums;
+using JT809.Protocol.JT809Formatters.JT809MessageBodyFormatters;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace JT809.Protocol.JT809MessageBody
+{
+    /// <summary>
+    /// 下级平台主动关闭主从链路通知消息
+    /// <para>链路类型:从链路</para>
+    /// <para>消息方向:下级平台往上级平台</para>
+    /// <para>业务数据类型标识:UP_CLOSELINIC INFORM</para>
+    /// <para>描述:下级平台作为服务端，发现从链路出现异常时，下级平台通过从链路向上级平台发送本消息，通知上级平台下级平台即将关闭主从链路</para>
+    /// </summary>
+    [JT809Formatter(typeof(JT809_0x1008Formatter))]
+    public class JT809_0x1008:JT809Bodies
+    {
+        /// <summary>
+        /// 错误代码
+        /// </summary>
+        public JT809_0x1008_ReasonCode ReasonCode { get; set; }
+    }
+}
diff --git a/src/JT809.Protocol/JT809MessageBody/JT809_0x9001.cs b/src/JT809.Protocol/JT809MessageBody/JT809_0x9001.cs
new file mode 100644
index 0000000..de479f6
--- /dev/null
+++ b/src/JT809.Protocol/JT809MessageBody/JT809_0x9001.cs
@@ -0,0 +1,25 @@
+using JT809.Protocol.JT809Attributes;
+using JT809.Protocol.JT809Formatters.JT809MessageBodyFormatters;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace JT809.Protocol.JT809MessageBody
+{
+    /// <summary>
+    /// 从链路连接请求消息
+    /// <para>链路类型:从链路</para>
+    /// <para>消息方向:上级平台往下级平台</para>
+    /// <para>业务数据类型标识:DOWN_CONNECT_REQ</para>
+    /// <para>描述:主链路建立连接后，上级平台向下级平台发送从链路连接清求消息，以建立从链路连接</para>
+    /// <para>下级平台在收到本息后，根据本校验码 VERIFY CODE 来实现数据的校验，校验后，则返回DOWN CONNECT RSP 消息</para>
+    /// </summary>
+    [JT809Formatter(typeof(JT809_0x9001Formatter))]
+    public class JT809_0x9001 : JT809Bodies
+    {
+        /// <summary>
+        /// 4.5.1.2 对应的校验码
+        /// </summary>
+        public uint VerifyCode { get; set; }
+    }
+}
diff --git a/src/JT809.Protocol/JT809MessageBody/JT809_0x9002.cs b/src/JT809.Protocol/JT809MessageBody/JT809_0x9002.cs
new file mode 100644
index 0000000..a4b0c1b
--- /dev/null
+++ b/src/JT809.Protocol/JT809MessageBody/JT809_0x9002.cs
@@ -0,0 +1,25 @@
+using JT809.Protocol.JT809Attributes;
+using JT809.Protocol.JT809Enums;
+using JT809.Protocol.JT809Formatters.JT809MessageBodyFormatters;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace JT809.Protocol.JT809MessageBody
+{
+    /// <summary>
+    /// 从链路连接应答信息
+    /// <para>链路类型:从链路</para>
+    /// <para>消息方问:下级平台往上级平台</para>
+    /// <para>业务数据类型标识:DOWN_CONNNECT_RSP</para>
+    /// <para>描述：下级平台作为服务器端向上级平台客户端返回从链路连接应答消息，上级平台在接收到该应答消息结果后</para>
+    /// </summary>
+    [JT809Formatter(typeof(JT809_0x9002Formatter))]
+    public class JT809_0x9002:JT809Bodies
+    {
+        /// <summary>
+        /// 验证结果
+        /// </summary>
+        public JT809_0x9002_Result Result { get; set; }
+    }
+}
diff --git a/src/JT809.Protocol/JT809MessageBody/JT809_0x9003.cs b/src/JT809.Protocol/JT809MessageBody/JT809_0x9003.cs
new file mode 100644
index 0000000..1ce37ca
--- /dev/null
+++ b/src/JT809.Protocol/JT809MessageBody/JT809_0x9003.cs
@@ -0,0 +1,24 @@
+using JT809.Protocol.JT809Attributes;
+using JT809.Protocol.JT809Formatters.JT809MessageBodyFormatters;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace JT809.Protocol.JT809MessageBody
+{
+    /// <summary>
+    ///从链路注销请求消息
+    ///<para>链路类型:从链路</para>
+    ///<para>消息方向:上级平台往下级平台</para>
+    ///<para>业务数据类型标识:DOWN_DISCONNIrCT_REQ</para>
+    ///<para>描述:从链路建立后，上级平台在取消该链路时，应向下级平台发送从链路注销请求消息</para>
+    /// </summary>
+    [JT809Formatter(typeof(JT809_0x9003Formatter))]
+    public class JT809_0x9003: JT809Bodies
+    {
+        /// <summary>
+        /// 校验码
+        /// </summary>
+        public uint VerifyCode { get; set; }
+    }
+}
diff --git a/src/JT809.Protocol/JT809MessageBody/JT809_0x9004.cs b/src/JT809.Protocol/JT809MessageBody/JT809_0x9004.cs
new file mode 100644
index 0000000..5f7c0c6
--- /dev/null
+++ b/src/JT809.Protocol/JT809MessageBody/JT809_0x9004.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace JT809.Protocol.JT809MessageBody
+{
+    /// <summary>
+    /// 从链路注销应答消息
+    /// <para>链路类型:从链路</para>
+    /// <para>消息方向:下级平台往上级平台</para>
+    /// <para>业务数据类型构之识:DOWN_DISCONNECT_RSP</para>
+    /// <para>描述:下级平台在收到上级平台发送的从链路注销请求消息后，返回从链路注销应答消息，记录相关日志，中断该从链路</para>
+    /// <para>从链路注销应答消息，数据体为空</para>
+    /// </summary>
+    public class JT809_0x9004:JT809Bodies
+    {
+    }
+}