diff --git a/src/JT808.Protocol.Test/MessageBody/JT808_0x0200Test.cs b/src/JT808.Protocol.Test/MessageBody/JT808_0x0200Test.cs
index 94eb983..78f4600 100644
--- a/src/JT808.Protocol.Test/MessageBody/JT808_0x0200Test.cs
+++ b/src/JT808.Protocol.Test/MessageBody/JT808_0x0200Test.cs
@@ -1,4 +1,5 @@
 using JT808.Protocol.Enums;
+using JT808.Protocol.Exceptions;
 using JT808.Protocol.Extensions;
 using JT808.Protocol.Interfaces;
 using JT808.Protocol.Internal;
@@ -370,9 +371,8 @@ namespace JT808.Protocol.Test.MessageBody
             Assert.Equal("7E0200005C11223344556622B8000000010000000200BA7F0E07E4F11C0028003C00001807151010100104000000640202003703020038040200011105010000000112060100000001011307000000020022012504000000172A0200F42B04000000F2300102310105167E", hex);
             //7E0200005C11223344556622B8000000010000000200BA7F0E07E4F11C0028003C00001807151010100104000000640202003703020038040200011105010000000112060100000001011307000000020022012504000000172A0200F42B04000000F2300102310105167E
         }
-
         [Fact]
-        public void Test6()
+        public void LatLngTest1_1()
         {
             JT808_0x0200 jT808UploadLocationRequest = new JT808_0x0200
             {
@@ -385,13 +385,12 @@ namespace JT808.Protocol.Test.MessageBody
                 Direction = 0,
                 JT808LocationAttachData = new Dictionary<byte, JT808_0x0200_BodyBase>()
             };
-            jT808UploadLocationRequest.StatusFlag = 402653184;
+            jT808UploadLocationRequest.StatusFlag = 0x18000000;
             var hex = JT808Serializer.Serialize(jT808UploadLocationRequest).ToHexString();
             Assert.Equal("0000000118000000FF4580F2F81B0EE40028003C0000180715101010", hex);
         }
-
         [Fact]
-        public void Test6_1()
+        public void LatLngTest1_2()
         {
             byte[] bodys = "0000000118000000FF4580F2F81B0EE40028003C0000180715101010".ToHexBytes();
             JT808_0x0200 jT808UploadLocationRequest = JT808Serializer.Deserialize<JT808_0x0200>(bodys);
@@ -402,28 +401,136 @@ namespace JT808.Protocol.Test.MessageBody
             Assert.Equal(-132444444, jT808UploadLocationRequest.Lng);
             Assert.Equal(60, jT808UploadLocationRequest.Speed); //‭402653184‬
         }
-
         [Fact]
-        public void Test7()
+        public void LatLngTest2_1()
         {
             JT808_0x0200 jT808UploadLocationRequest = new JT808_0x0200
             {
                 AlarmFlag = 1,
                 Altitude = 40,
                 GPSTime = DateTime.Parse("2018-07-15 10:10:10"),
-                Lat = 12222222,
+                Lat = -12222222,
+                Lng = -132444444,
+                Speed = 60,
+                Direction = 0,
+                JT808LocationAttachData = new Dictionary<byte, JT808_0x0200_BodyBase>()
+            };
+            jT808UploadLocationRequest.StatusFlag = 0x18000000 | 0x302;
+            var hex = JT808Serializer.Serialize(jT808UploadLocationRequest).ToHexString();
+            Assert.Equal("0000000118000302FF4580F2F81B0EE40028003C0000180715101010", hex);
+        }
+        [Fact]
+        public void LatLngTest2_2()
+        {
+            byte[] bodys = "0000000118000302FF4580F2F81B0EE40028003C0000180715101010".ToHexBytes();
+            JT808_0x0200 jT808UploadLocationRequest = JT808Serializer.Deserialize<JT808_0x0200>(bodys);
+            Assert.Equal(1u, jT808UploadLocationRequest.AlarmFlag);
+            Assert.Equal((uint)(0x18000000 | 0x302), jT808UploadLocationRequest.StatusFlag);
+            Assert.Equal(DateTime.Parse("2018-07-15 10:10:10"), jT808UploadLocationRequest.GPSTime);
+            Assert.Equal(-12222222, jT808UploadLocationRequest.Lat);
+            Assert.Equal(-132444444, jT808UploadLocationRequest.Lng);
+            Assert.Equal(60, jT808UploadLocationRequest.Speed); //‭402653184‬
+        }
+        [Fact]
+        public void LatTest1_1()
+        {
+            JT808_0x0200 jT808UploadLocationRequest = new JT808_0x0200
+            {
+                AlarmFlag = 1,
+                Altitude = 40,
+                GPSTime = DateTime.Parse("2018-07-15 10:10:10"),
+                Lat = -12222222,
+                Lng = 132444444,
+                Speed = 60,
+                Direction = 0,
+                JT808LocationAttachData = new Dictionary<byte, JT808_0x0200_BodyBase>()
+            };
+            jT808UploadLocationRequest.StatusFlag = 0x10000000;
+            var hex = JT808Serializer.Serialize(jT808UploadLocationRequest).ToHexString();
+            Assert.Equal("0000000110000000FF4580F207E4F11C0028003C0000180715101010", hex);
+        }
+        [Fact]
+        public void LatTest1_2()
+        {
+            byte[] bodys = "0000000110000000FF4580F207E4F11C0028003C0000180715101010".ToHexBytes();
+            JT808_0x0200 jT808UploadLocationRequest = JT808Serializer.Deserialize<JT808_0x0200>(bodys);
+            Assert.Equal(1u, jT808UploadLocationRequest.AlarmFlag);
+            Assert.Equal((uint)0x10000000, jT808UploadLocationRequest.StatusFlag);
+            Assert.Equal(DateTime.Parse("2018-07-15 10:10:10"), jT808UploadLocationRequest.GPSTime);
+            Assert.Equal(-12222222, jT808UploadLocationRequest.Lat);
+            Assert.Equal(132444444, jT808UploadLocationRequest.Lng);
+            Assert.Equal(60, jT808UploadLocationRequest.Speed); //‭402653184‬
+        }
+        [Fact]
+        public void LatTest2()
+        {
+            JT808Exception exception= Assert.Throws<JT808Exception>(() => {
+                JT808_0x0200 jT808UploadLocationRequest = new JT808_0x0200
+                {
+                    AlarmFlag = 1,
+                    Altitude = 40,
+                    GPSTime = DateTime.Parse("2018-07-15 10:10:10"),
+                    Lat = -12222222,
+                    Lng = 132444444,
+                    Speed = 60,
+                    Direction = 0,
+                    JT808LocationAttachData = new Dictionary<byte, JT808_0x0200_BodyBase>()
+                };
+                jT808UploadLocationRequest.StatusFlag = 1111;
+                var hex = JT808Serializer.Serialize(jT808UploadLocationRequest).ToHexString();
+            });
+            Assert.Equal(JT808ErrorCode.LatOrLngError, exception.ErrorCode);
+        }
+        [Fact]
+        public void LatTest3_1()
+        {
+            JT808_0x0200 jT808UploadLocationRequest = new JT808_0x0200
+            {
+                AlarmFlag = 1,
+                Altitude = 40,
+                GPSTime = DateTime.Parse("2018-07-15 10:10:10"),
+                Lat = -12222222,
                 Lng = 132444444,
                 Speed = 60,
                 Direction = 0,
                 JT808LocationAttachData = new Dictionary<byte, JT808_0x0200_BodyBase>()
             };
+            jT808UploadLocationRequest.StatusFlag = 0x10000000 | 0x000300;
+            var hex = JT808Serializer.Serialize(jT808UploadLocationRequest).ToHexString();
+            Assert.Equal("0000000110000300FF4580F207E4F11C0028003C0000180715101010", hex);
+        }
+        [Fact]
+        public void LatTest3_2()
+        {
+            byte[] bodys = "0000000110000300FF4580F207E4F11C0028003C0000180715101010".ToHexBytes();
+            JT808_0x0200 jT808UploadLocationRequest = JT808Serializer.Deserialize<JT808_0x0200>(bodys);
+            Assert.Equal(1u, jT808UploadLocationRequest.AlarmFlag);
+            Assert.Equal((uint)(0x10000000 | 0x000300), jT808UploadLocationRequest.StatusFlag);
+            Assert.Equal(DateTime.Parse("2018-07-15 10:10:10"), jT808UploadLocationRequest.GPSTime);
+            Assert.Equal(-12222222, jT808UploadLocationRequest.Lat);
+            Assert.Equal(132444444, jT808UploadLocationRequest.Lng);
+            Assert.Equal(60, jT808UploadLocationRequest.Speed); //‭402653184‬
+        }
+        [Fact]
+        public void LngTest1_1()
+        {
+            JT808_0x0200 jT808UploadLocationRequest = new JT808_0x0200
+            {
+                AlarmFlag = 1,
+                Altitude = 40,
+                GPSTime = DateTime.Parse("2018-07-15 10:10:10"),
+                Lat = 12222222,
+                Lng = -132444444,
+                Speed = 60,
+                Direction = 0,
+                JT808LocationAttachData = new Dictionary<byte, JT808_0x0200_BodyBase>()
+            };
             jT808UploadLocationRequest.StatusFlag = 0x8000000;
             var hex = JT808Serializer.Serialize(jT808UploadLocationRequest).ToHexString();
             Assert.Equal("000000010800000000BA7F0EF81B0EE40028003C0000180715101010", hex);
         }
-
         [Fact]
-        public void Test7_1()
+        public void LngTest1_2()
         {
             byte[] bodys = "000000010800000000BA7F0EF81B0EE40028003C0000180715101010".ToHexBytes();
             JT808_0x0200 jT808UploadLocationRequest = JT808Serializer.Deserialize<JT808_0x0200>(bodys);
@@ -434,5 +541,55 @@ namespace JT808.Protocol.Test.MessageBody
             Assert.Equal(-132444444, jT808UploadLocationRequest.Lng);
             Assert.Equal(60, jT808UploadLocationRequest.Speed); //‭402653184‬
         }
+        [Fact]
+        public void LngTest2()
+        {
+            JT808Exception exception = Assert.Throws<JT808Exception>(() => {
+                JT808_0x0200 jT808UploadLocationRequest = new JT808_0x0200
+                {
+                    AlarmFlag = 1,
+                    Altitude = 40,
+                    GPSTime = DateTime.Parse("2018-07-15 10:10:10"),
+                    Lat = 12222222,
+                    Lng = -132444444,
+                    Speed = 60,
+                    Direction = 0,
+                    JT808LocationAttachData = new Dictionary<byte, JT808_0x0200_BodyBase>()
+                };
+                jT808UploadLocationRequest.StatusFlag = 1111;
+                var hex = JT808Serializer.Serialize(jT808UploadLocationRequest).ToHexString();
+            });
+            Assert.Equal(JT808ErrorCode.LatOrLngError, exception.ErrorCode);
+        }
+        [Fact]
+        public void LngTest3_1()
+        {
+            JT808_0x0200 jT808UploadLocationRequest = new JT808_0x0200
+            {
+                AlarmFlag = 1,
+                Altitude = 40,
+                GPSTime = DateTime.Parse("2018-07-15 10:10:10"),
+                Lat = 12222222,
+                Lng = -132444444,
+                Speed = 60,
+                Direction = 0,
+                JT808LocationAttachData = new Dictionary<byte, JT808_0x0200_BodyBase>()
+            };
+            jT808UploadLocationRequest.StatusFlag = 0x8000000|0x6601;
+            var hex = JT808Serializer.Serialize(jT808UploadLocationRequest).ToHexString();
+            Assert.Equal("000000010800660100BA7F0EF81B0EE40028003C0000180715101010", hex);
+        }
+        [Fact]
+        public void LngTest3_2()
+        {
+            byte[] bodys = "000000010800660100BA7F0EF81B0EE40028003C0000180715101010".ToHexBytes();
+            JT808_0x0200 jT808UploadLocationRequest = JT808Serializer.Deserialize<JT808_0x0200>(bodys);
+            Assert.Equal(1u, jT808UploadLocationRequest.AlarmFlag);
+            Assert.Equal((uint)(0x8000000 | 0x6601), jT808UploadLocationRequest.StatusFlag);
+            Assert.Equal(DateTime.Parse("2018-07-15 10:10:10"), jT808UploadLocationRequest.GPSTime);
+            Assert.Equal(12222222, jT808UploadLocationRequest.Lat);
+            Assert.Equal(-132444444, jT808UploadLocationRequest.Lng);
+            Assert.Equal(60, jT808UploadLocationRequest.Speed); //‭402653184‬
+        }
     }
 }
diff --git a/src/JT808.Protocol/Enums/JT808ErrorCode.cs b/src/JT808.Protocol/Enums/JT808ErrorCode.cs
index f36d2fe..92e9837 100644
--- a/src/JT808.Protocol/Enums/JT808ErrorCode.cs
+++ b/src/JT808.Protocol/Enums/JT808ErrorCode.cs
@@ -32,6 +32,10 @@
         /// 没有全局注册格式化器
         /// <see cref="JT808.Protocol.Formatters.IJT808MessagePackFormatter<T>"/>
         /// </summary>
-        NotGlobalRegisterFormatterAssembly = 1008
+        NotGlobalRegisterFormatterAssembly = 1008,        
+        /// <summary>
+        /// 经纬度错误
+        /// </summary>
+        LatOrLngError = 1009
     }
 }
diff --git a/src/JT808.Protocol/Formatters/MessageBodyFormatters/JT808_0x0200_Formatter.cs b/src/JT808.Protocol/Formatters/MessageBodyFormatters/JT808_0x0200_Formatter.cs
index f249095..8584ac7 100644
--- a/src/JT808.Protocol/Formatters/MessageBodyFormatters/JT808_0x0200_Formatter.cs
+++ b/src/JT808.Protocol/Formatters/MessageBodyFormatters/JT808_0x0200_Formatter.cs
@@ -5,6 +5,8 @@ using System;
 using System.Collections.Generic;
 using JT808.Protocol.Interfaces;
 using JT808.Protocol.MessagePack;
+using JT808.Protocol.Exceptions;
+using JT808.Protocol.Enums;
 
 namespace JT808.Protocol.Formatters.MessageBodyFormatters
 {
@@ -15,21 +17,21 @@ namespace JT808.Protocol.Formatters.MessageBodyFormatters
             JT808_0x0200 jT808_0X0200 = new JT808_0x0200();
             jT808_0X0200.AlarmFlag = reader.ReadUInt32();
             jT808_0X0200.StatusFlag = reader.ReadUInt32();
-            jT808_0X0200.Lng = reader.ReadInt32();
-            jT808_0X0200.Lng = reader.ReadInt32();
-#warning 反解析的时候  负数
-            switch (jT808_0X0200.StatusFlag)
+            if (((jT808_0X0200.StatusFlag >> 28) & 1) == 1)
+            {   //南纬 268435456 0x10000000
+                jT808_0X0200.Lat = (int)reader.ReadUInt32();
+            }
+            else
+            {
+                jT808_0X0200.Lat = reader.ReadInt32();
+            }
+            if (((jT808_0X0200.StatusFlag >> 27) & 1) == 1)
+            {   //西经 ‭134217728‬ 0x8000000
+                jT808_0X0200.Lng = (int)reader.ReadUInt32();
+            }
+            else
             {
-                case 0x8000000: //西经 ‭134217728‬
-                    //jT808_0X0200.Lng  = -lng;
-                    break;
-                case 0x10000000: //南纬 268435456
-                    //jT808_0X0200.Lat = -lat;
-                    break;
-                case 0x18000000: //西经-南纬 ‭402653184‬
-                    //jT808_0X0200.Lat = -lat;
-                    //jT808_0X0200.Lng = -lng;
-                    break;
+                jT808_0X0200.Lng = reader.ReadInt32();
             }
             jT808_0X0200.Altitude = reader.ReadUInt16();
             jT808_0X0200.Speed = reader.ReadUInt16();
@@ -87,22 +89,35 @@ namespace JT808.Protocol.Formatters.MessageBodyFormatters
         {
             writer.WriteUInt32(value.AlarmFlag);
             writer.WriteUInt32(value.StatusFlag);
-#warning 反解析的时候  负数
-            switch (value.StatusFlag)
+            //0x10000000 南纬 134217728
+            //0x8000000  西经 ‭‬268435456
+            //0x18000000 南纬-西经 134217728+268435456
+            if (((value.StatusFlag >> 28) & 1) == 1)
+            {
+                uint lat=(uint)value.Lat;
+                writer.WriteUInt32(lat);
+            }
+            else
+            {
+                if (value.Lat < 0)
+                {
+                    throw new JT808Exception(JT808ErrorCode.LatOrLngError, $"Lat {nameof(JT808_0x0200.StatusFlag)} ({value.StatusFlag}>>28) !=1");
+                }
+                writer.WriteInt32(value.Lat);
+            }
+            if (((value.StatusFlag >> 27) & 1) == 1)
             {
-                case 0x8000000: //西经 ‭134217728‬
-                    value.Lat = -value.Lat;
-                    break;
-                case 0x10000000: //南纬 268435456
-                    value.Lng = -value.Lng;
-                    break;
-                case 0x18000000: //西经-南纬 ‭402653184‬
-                    value.Lat = -value.Lat;
-                    value.Lng = -value.Lng;
-                    break;
+                uint lng = (uint)value.Lng;
+                writer.WriteUInt32(lng);
+            }
+            else
+            {
+                if (value.Lng < 0)
+                {
+                    throw new JT808Exception(JT808ErrorCode.LatOrLngError, $"Lng {nameof(JT808_0x0200.StatusFlag)} ({value.StatusFlag}>>29) !=1");
+                }
+                writer.WriteInt32(value.Lng);
             }
-            writer.WriteInt32(value.Lat);
-            writer.WriteInt32(value.Lng);
             writer.WriteUInt16(value.Altitude);
             writer.WriteUInt16(value.Speed);
             writer.WriteUInt16(value.Direction);