diff --git a/src/JT808.Protocol.Test/MessageBody/JT808_0x0200Test.cs b/src/JT808.Protocol.Test/MessageBody/JT808_0x0200Test.cs
index ad62ced..5a58bf6 100644
--- a/src/JT808.Protocol.Test/MessageBody/JT808_0x0200Test.cs
+++ b/src/JT808.Protocol.Test/MessageBody/JT808_0x0200Test.cs
@@ -140,7 +140,7 @@ namespace JT808.Protocol.Test.MessageBody
             Assert.Equal(132444444, jT808UploadLocationRequest.Lng);
             Assert.Equal(60, jT808UploadLocationRequest.Speed);
             Assert.Equal((uint)2, jT808UploadLocationRequest.StatusFlag);
-            Assert.Equal(100, ((JT808_0x0200_0x01)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
+            Assert.Equal(100u, ((JT808_0x0200_0x01)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
             Assert.Equal(55, ((JT808_0x0200_0x02)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x02]).Oil);
         }
 
@@ -215,7 +215,7 @@ namespace JT808.Protocol.Test.MessageBody
             Assert.Equal(132444444, jT808UploadLocationRequest.Lng);
             Assert.Equal(60, jT808UploadLocationRequest.Speed);
             Assert.Equal((uint)2, jT808UploadLocationRequest.StatusFlag);
-            Assert.Equal(100, ((JT808_0x0200_0x01)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
+            Assert.Equal(100u, ((JT808_0x0200_0x01)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
             Assert.Equal(55, ((JT808_0x0200_0x02)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x02]).Oil);
             var jT808LocationAttachImpl0x61 = (JT808LocationAttachImpl0x61)jT808UploadLocationRequest.CustomLocationAttachData[0x61];
             Assert.Equal(18, jT808LocationAttachImpl0x61.Age);
@@ -307,7 +307,7 @@ namespace JT808.Protocol.Test.MessageBody
             Assert.Equal(132444444, jT808UploadLocationRequest.Lng);
             Assert.Equal(60, jT808UploadLocationRequest.Speed);
             Assert.Equal((uint)2, jT808UploadLocationRequest.StatusFlag);
-            Assert.Equal(100, ((JT808_0x0200_0x01)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
+            Assert.Equal(100u, ((JT808_0x0200_0x01)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
             Assert.Equal(55, ((JT808_0x0200_0x02)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x02]).Oil);
         }
         [Fact]
diff --git a/src/JT808.Protocol.Test/MessageBody/JT808_0x0201Test.cs b/src/JT808.Protocol.Test/MessageBody/JT808_0x0201Test.cs
index 831a7ce..5ec40a7 100644
--- a/src/JT808.Protocol.Test/MessageBody/JT808_0x0201Test.cs
+++ b/src/JT808.Protocol.Test/MessageBody/JT808_0x0201Test.cs
@@ -65,7 +65,7 @@ namespace JT808.Protocol.Test.MessageBody
             Assert.Equal(132444444, jT808_0X0201.Position.Lng);
             Assert.Equal(60, jT808_0X0201.Position.Speed);
             Assert.Equal((uint)2, jT808_0X0201.Position.StatusFlag);
-            Assert.Equal(100, ((JT808_0x0200_0x01)jT808_0X0201.Position.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
+            Assert.Equal(100u, ((JT808_0x0200_0x01)jT808_0X0201.Position.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
             Assert.Equal(55, ((JT808_0x0200_0x02)jT808_0X0201.Position.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x02]).Oil);
         }
 
diff --git a/src/JT808.Protocol.Test/MessageBody/JT808_0x0500Test.cs b/src/JT808.Protocol.Test/MessageBody/JT808_0x0500Test.cs
index 21dcefc..c9395e6 100644
--- a/src/JT808.Protocol.Test/MessageBody/JT808_0x0500Test.cs
+++ b/src/JT808.Protocol.Test/MessageBody/JT808_0x0500Test.cs
@@ -67,7 +67,7 @@ namespace JT808.Protocol.Test.MessageBody
             Assert.Equal(0, JT808Bodies.JT808_0x0200.Direction);
             Assert.Equal(60, JT808Bodies.JT808_0x0200.Speed);
             Assert.Equal((uint)2, JT808Bodies.JT808_0x0200.StatusFlag);
-            Assert.Equal(100, ((JT808_0x0200_0x01)JT808Bodies.JT808_0x0200.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
+            Assert.Equal(100u, ((JT808_0x0200_0x01)JT808Bodies.JT808_0x0200.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
             Assert.Equal(55, ((JT808_0x0200_0x02)JT808Bodies.JT808_0x0200.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x02]).Oil);
         }
 
diff --git a/src/JT808.Protocol.Test/MessageBody/JT808_0x0704Test.cs b/src/JT808.Protocol.Test/MessageBody/JT808_0x0704Test.cs
index 57478c9..3a9bdcf 100644
--- a/src/JT808.Protocol.Test/MessageBody/JT808_0x0704Test.cs
+++ b/src/JT808.Protocol.Test/MessageBody/JT808_0x0704Test.cs
@@ -143,7 +143,7 @@ namespace JT808.Protocol.Test.MessageBody
             Assert.Equal(0, JT808Bodies.Positions[0].Direction);
             Assert.Equal(60, JT808Bodies.Positions[0].Speed);
             Assert.Equal((uint)2, JT808Bodies.Positions[0].StatusFlag);
-            Assert.Equal(100, ((JT808_0x0200_0x01)JT808Bodies.Positions[0].BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
+            Assert.Equal(100u, ((JT808_0x0200_0x01)JT808Bodies.Positions[0].BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
             Assert.Equal(55, ((JT808_0x0200_0x02)JT808Bodies.Positions[0].BasicLocationAttachData[JT808Constants.JT808_0x0200_0x02]).Oil);
 
             Assert.Equal((uint)2, JT808Bodies.Positions[1].AlarmFlag);
@@ -153,7 +153,7 @@ namespace JT808.Protocol.Test.MessageBody
             Assert.Equal(54, JT808Bodies.Positions[1].Speed);
             Assert.Equal(120, JT808Bodies.Positions[1].Direction);
             Assert.Equal((uint)1, JT808Bodies.Positions[1].StatusFlag);
-            Assert.Equal(96, ((JT808_0x0200_0x01)JT808Bodies.Positions[1].BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
+            Assert.Equal(96u, ((JT808_0x0200_0x01)JT808Bodies.Positions[1].BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
             Assert.Equal(66, ((JT808_0x0200_0x02)JT808Bodies.Positions[1].BasicLocationAttachData[JT808Constants.JT808_0x0200_0x02]).Oil);
         }
 
diff --git a/src/JT808.Protocol.Test/Simples/Demo10.cs b/src/JT808.Protocol.Test/Simples/Demo10.cs
index e77f475..8136d5b 100644
--- a/src/JT808.Protocol.Test/Simples/Demo10.cs
+++ b/src/JT808.Protocol.Test/Simples/Demo10.cs
@@ -103,7 +103,7 @@ namespace JT808.Protocol.Test.Simples
             Assert.Equal(132444444, jT808UploadLocationRequest.Lng);
             Assert.Equal(60, jT808UploadLocationRequest.Speed);
             Assert.Equal(2u, jT808UploadLocationRequest.StatusFlag);
-            Assert.Equal(100, ((JT808_0x0200_0x01)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
+            Assert.Equal(100u, ((JT808_0x0200_0x01)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
             Assert.Equal(55, ((JT808_0x0200_0x02)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x02]).Oil);
             var jT808LocationAttachImpl0XDF = (JT808LocationAttachImpl0xDF)jT808UploadLocationRequest.CustomLocationAttachData[0xDF];
             Assert.Equal(0xDF, jT808LocationAttachImpl0XDF.AttachInfoId);
@@ -167,7 +167,7 @@ namespace JT808.Protocol.Test.Simples
             Assert.Equal(132444444, jT808UploadLocationRequest.Lng);
             Assert.Equal(60, jT808UploadLocationRequest.Speed);
             Assert.Equal(2u, jT808UploadLocationRequest.StatusFlag);
-            Assert.Equal(100, ((JT808_0x0200_0x01)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
+            Assert.Equal(100u, ((JT808_0x0200_0x01)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
             Assert.Equal(55, ((JT808_0x0200_0x02)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x02]).Oil);
             var jT808LocationAttachImpl0XDD = (JT808LocationAttachImpl0xDD)jT808UploadLocationRequest.CustomLocationAttachData3[0xDD];
             Assert.Equal(0xDD, jT808LocationAttachImpl0XDD.AttachInfoId);
@@ -231,7 +231,7 @@ namespace JT808.Protocol.Test.Simples
             Assert.Equal(132444444, jT808UploadLocationRequest.Lng);
             Assert.Equal(60, jT808UploadLocationRequest.Speed);
             Assert.Equal(2u, jT808UploadLocationRequest.StatusFlag);
-            Assert.Equal(100, ((JT808_0x0200_0x01)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
+            Assert.Equal(100u, ((JT808_0x0200_0x01)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
             Assert.Equal(55, ((JT808_0x0200_0x02)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x02]).Oil);
             var jT808LocationAttachImpl0XDE = (JT808LocationAttachImpl0xDE)jT808UploadLocationRequest.CustomLocationAttachData2[0xDE];
             Assert.Equal(0xDE, jT808LocationAttachImpl0XDE.AttachInfoId);
@@ -295,7 +295,7 @@ namespace JT808.Protocol.Test.Simples
             Assert.Equal(132444444, jT808UploadLocationRequest.Lng);
             Assert.Equal(60, jT808UploadLocationRequest.Speed);
             Assert.Equal(2u, jT808UploadLocationRequest.StatusFlag);
-            Assert.Equal(100, ((JT808_0x0200_0x01)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
+            Assert.Equal(100u, ((JT808_0x0200_0x01)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
             Assert.Equal(55, ((JT808_0x0200_0x02)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x02]).Oil);
             var jT808LocationAttachImpl0X62 = (JT808LocationAttachImpl0x62)jT808UploadLocationRequest.CustomLocationAttachData4[0x62];
             Assert.Equal(0x62, jT808LocationAttachImpl0X62.AttachInfoId);
@@ -380,7 +380,7 @@ namespace JT808.Protocol.Test.Simples
             Assert.Equal(132444444, jT808UploadLocationRequest.Lng);
             Assert.Equal(60, jT808UploadLocationRequest.Speed);
             Assert.Equal(2u, jT808UploadLocationRequest.StatusFlag);
-            Assert.Equal(100, ((JT808_0x0200_0x01)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
+            Assert.Equal(100u, ((JT808_0x0200_0x01)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
             Assert.Equal(55, ((JT808_0x0200_0x02)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x02]).Oil);
 
             var jT808LocationAttachImpl0X62 = (JT808LocationAttachImpl0x62)jT808UploadLocationRequest.CustomLocationAttachData4[0x62];
@@ -475,7 +475,7 @@ namespace JT808.Protocol.Test.Simples
             Assert.Equal(132444444, jT808UploadLocationRequest.Lng);
             Assert.Equal(60, jT808UploadLocationRequest.Speed);
             Assert.Equal(2u, jT808UploadLocationRequest.StatusFlag);
-            Assert.Equal(100, ((JT808_0x0200_0x01)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
+            Assert.Equal(100u, ((JT808_0x0200_0x01)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
             Assert.Equal(55, ((JT808_0x0200_0x02)jT808UploadLocationRequest.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x02]).Oil);
 
             var jT808LocationAttachImpl0XDF = (JT808LocationAttachImpl0xDF)jT808UploadLocationRequest.CustomLocationAttachData[0xDF];
diff --git a/src/JT808.Protocol.Test/Simples/Demo2.cs b/src/JT808.Protocol.Test/Simples/Demo2.cs
index b1da104..52bdce1 100644
--- a/src/JT808.Protocol.Test/Simples/Demo2.cs
+++ b/src/JT808.Protocol.Test/Simples/Demo2.cs
@@ -50,7 +50,7 @@ namespace JT808.Protocol.Test.Simples
             Assert.Equal(0, jT808_0x0200.Direction);
             Assert.Equal((uint)2, jT808_0x0200.StatusFlag);
             //4.1.附加信息1
-            Assert.Equal(100, ((JT808_0x0200_0x01)jT808_0x0200.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
+            Assert.Equal(100u, ((JT808_0x0200_0x01)jT808_0x0200.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x01]).Mileage);
             //4.2.附加信息2
             Assert.Equal(125, ((JT808_0x0200_0x02)jT808_0x0200.BasicLocationAttachData[JT808Constants.JT808_0x0200_0x02]).Oil);
         }
diff --git a/src/JT808.Protocol/MessageBody/JT808_0x0200_0x01.cs b/src/JT808.Protocol/MessageBody/JT808_0x0200_0x01.cs
index e0570cd..8b1d0ce 100644
--- a/src/JT808.Protocol/MessageBody/JT808_0x0200_0x01.cs
+++ b/src/JT808.Protocol/MessageBody/JT808_0x0200_0x01.cs
@@ -23,7 +23,7 @@ namespace JT808.Protocol.MessageBody
         /// <summary>
         /// 里程
         /// </summary>
-        public int Mileage { get; set; }
+        public uint Mileage { get; set; }
         /// <summary>
         /// 里程 1/10km，对应车上里程表读数
         /// </summary>
@@ -42,7 +42,7 @@ namespace JT808.Protocol.MessageBody
             writer.WriteNumber($"[{value.AttachInfoId.ReadNumber()}]附加信息Id", value.AttachInfoId);
             value.AttachInfoLength = reader.ReadByte();
             writer.WriteNumber($"[{value.AttachInfoLength.ReadNumber()}]附加信息长度", value.AttachInfoLength);
-            value.Mileage = reader.ReadInt32();
+            value.Mileage = reader.ReadUInt32();
             writer.WriteNumber($"[{value.Mileage.ReadNumber()}]里程", value.Mileage);
         }
         /// <summary>
@@ -56,7 +56,7 @@ namespace JT808.Protocol.MessageBody
             JT808_0x0200_0x01 value = new JT808_0x0200_0x01();
             value.AttachInfoId = reader.ReadByte();
             value.AttachInfoLength = reader.ReadByte();
-            value.Mileage = reader.ReadInt32();
+            value.Mileage = reader.ReadUInt32();
             return value;
         }
         /// <summary>
@@ -69,7 +69,7 @@ namespace JT808.Protocol.MessageBody
         {
             writer.WriteByte(value.AttachInfoId);
             writer.WriteByte(value.AttachInfoLength);
-            writer.WriteInt32(value.Mileage);
+            writer.WriteUInt32(value.Mileage);
         }
     }
 }