diff --git a/src/JT809.Protocol/Encrypt/JT809EncryptImpl.cs b/src/JT809.Protocol/Encrypt/JT809EncryptImpl.cs
index 03a93e9..f3d4d30 100644
--- a/src/JT809.Protocol/Encrypt/JT809EncryptImpl.cs
+++ b/src/JT809.Protocol/Encrypt/JT809EncryptImpl.cs
@@ -36,6 +36,6 @@ namespace JT809.Protocol.Encrypt
                 Config.Key = Config.IA1 * (Config.Key % mkey) + Config.IC1;
                 buffer[idx] ^= (byte)((Config.Key >> 20) & 0xFF);
             }
-        }
+        } 
     }
 }
diff --git a/src/JT809.Protocol/Enums/ErrorCode.cs b/src/JT809.Protocol/Enums/ErrorCode.cs
new file mode 100644
index 0000000..667418a
--- /dev/null
+++ b/src/JT809.Protocol/Enums/ErrorCode.cs
@@ -0,0 +1,11 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace JT809.Protocol.Enums
+{
+    public enum ErrorCode
+    {
+        CRC16CheckInvalid = 1001
+    }
+}
diff --git a/src/JT809.Protocol/Exceptions/JT809Exception.cs b/src/JT809.Protocol/Exceptions/JT809Exception.cs
new file mode 100644
index 0000000..96a9d17
--- /dev/null
+++ b/src/JT809.Protocol/Exceptions/JT809Exception.cs
@@ -0,0 +1,25 @@
+using JT809.Protocol.Enums;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace JT809.Protocol.Exceptions
+{
+    public class JT809Exception:Exception
+    {
+        private readonly ErrorCode errorCode;
+
+        public JT809Exception(ErrorCode errorCode) : base(errorCode.ToString())
+        {
+            this.errorCode = errorCode;
+        }
+
+        public JT809Exception(ErrorCode errorCode, string message) : base(message)
+        {
+            this.errorCode = errorCode;
+        }
+
+
+        public ErrorCode ErrorCode => errorCode;
+    }
+}
diff --git a/src/JT809.Protocol/ProtocolPacket/Header.cs b/src/JT809.Protocol/ProtocolPacket/Header.cs
index 876760b..05fd481 100644
--- a/src/JT809.Protocol/ProtocolPacket/Header.cs
+++ b/src/JT809.Protocol/ProtocolPacket/Header.cs
@@ -42,12 +42,15 @@ namespace JT809.Protocol.ProtocolPacket
         /// </summary>
         public uint GNSSCENTERID { get; set; }
         public Version Version { get; private set; }
-        public EncryptOpitions EncryptOpitions { get; private set; }
+        public EncryptOpitions EncryptOpition { get; private set; }
         /// <summary>
         /// 数据加密的密匙，长度为 4 个字节。
         /// </summary>
         public uint EncryptKey { get; private set; } = 0X00;
 
+        public Header(byte[] buffer) : base(buffer) { CounterOnRecieveGenerater++; }
+
+
         protected override void InitializeProperties(object[] properties, int startIndex)
         {
             throw new NotImplementedException();
diff --git a/src/JT809.Protocol/ProtocolPacket/Package.cs b/src/JT809.Protocol/ProtocolPacket/Package.cs
index 15b67ca..0d141aa 100644
--- a/src/JT809.Protocol/ProtocolPacket/Package.cs
+++ b/src/JT809.Protocol/ProtocolPacket/Package.cs
@@ -2,6 +2,8 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Text;
+using JT809.Protocol.Enums;
+using JT809.Protocol.Exceptions;
 using JT809.Protocol.ProtocolPacket.Extensions;
 
 namespace JT809.Protocol.ProtocolPacket
@@ -39,7 +41,20 @@ namespace JT809.Protocol.ProtocolPacket
             var content01 = this.UnEscape(content00);
             var crc16 = this.CRC16_CCITT(content01, 0, content01.Length - Crc16ByteLength);
             CRC16 = BitConverter.ToUInt16(new[] { content01[content01.Length - 1], content01[content01.Length - 2] }, 0);
-            if (CRC16 != crc16) throw new InvalidDataException("CRC16 check invalid.");
+            if (CRC16 != crc16) throw new JT809Exception(ErrorCode.CRC16CheckInvalid);
+            Header = new Header(content01);
+            var bodyBuffer00 = new byte[content01.Length - Header.HeaderFixedByteLength - Crc16ByteLength];
+            Array.Copy(content01, Header.HeaderFixedByteLength, bodyBuffer00, 0, bodyBuffer00.Length);
+            //Default
+            byte[] bodyBuffer01 = bodyBuffer00;
+            switch (Header.EncryptOpition)
+            {
+                case EncryptOpitions.None:
+                    break;
+                case EncryptOpitions.Common:
+                  //  bodyBuffer01 = this.EncryptExt(Header.KeyForCommonEncrypt, bodyBuffer01, bodyBuffer01.Length, Config.Value.ServiceGB809Info.MasterLinkInfo.M1, Config.Value.ServiceGB809Info.MasterLinkInfo.IA1, Config.Value.ServiceGB809Info.MasterLinkInfo.IC1);
+                    break;
+            }
         }
 
         protected override void OnWriteToBuffer(BinaryWriter writer)