diff --git a/src/JT808.Protocol.Test/MessageBody/JT808_0x0107Test.cs b/src/JT808.Protocol.Test/MessageBody/JT808_0x0107Test.cs
index 2d90389..b600fe5 100644
--- a/src/JT808.Protocol.Test/MessageBody/JT808_0x0107Test.cs
+++ b/src/JT808.Protocol.Test/MessageBody/JT808_0x0107Test.cs
@@ -36,13 +36,13 @@ namespace JT808.Protocol.Test.MessageBody
             };
             jT808Package.Bodies = jT808_0X0107;
             string hex = JT808Serializer.Serialize(jT808Package).ToHexString();
-            Assert.Equal("7E0107004111223344556622B8000531303630313130343535353435393535313033000000000000346436613133301234567890123456789007616263646566670A706F69757974726577710709DA7E".Replace(" ", ""), hex);
+            Assert.Equal("7E0107004111223344556622B8000531303630313130343535353435393535313033000000000000346436613133001234567890123456789007616263646566670A706F69757974726577710709EA7E".Replace(" ", ""), hex);
         }
 
         [Fact]
         public void Test2()
         {
-            byte[] bytes = "7E0107004111223344556622B8000531303630313130343535353435393535313033000000000000346436613133301234567890123456789007616263646566670A706F69757974726577710709DA7E".ToHexBytes();
+            byte[] bytes = "7E0107004111223344556622B8000531303630313130343535353435393535313033000000000000346436613133001234567890123456789007616263646566670A706F69757974726577710709EA7E".ToHexBytes();
             JT808Package jT808Package = JT808Serializer.Deserialize(bytes);
             JT808_0x0107 jT808_0X0107 = (JT808_0x0107)jT808Package.Bodies;
             Assert.Equal(8888, jT808Package.Header.MsgNum);
@@ -51,7 +51,7 @@ namespace JT808.Protocol.Test.MessageBody
             Assert.Equal(5, jT808_0X0107.TerminalType);
             Assert.Equal("10601", jT808_0X0107.MakerId);
             Assert.Equal("10455545955103", jT808_0X0107.TerminalModel);
-            Assert.Equal("4d6a130", jT808_0X0107.TerminalId);
+            Assert.Equal("4d6a13", jT808_0X0107.TerminalId);
             Assert.Equal("12345678901234567890", jT808_0X0107.Terminal_SIM_ICCID);
             Assert.Equal("abcdefg", jT808_0X0107.Terminal_Hardware_Version_Num);
             Assert.Equal("poiuytrewq", jT808_0X0107.Terminal_Firmware_Version_Num);
diff --git a/src/JT808.Protocol.Test/MessageBody/JT808_0x0702Test.cs b/src/JT808.Protocol.Test/MessageBody/JT808_0x0702Test.cs
index 5bf9654..0f12221 100644
--- a/src/JT808.Protocol.Test/MessageBody/JT808_0x0702Test.cs
+++ b/src/JT808.Protocol.Test/MessageBody/JT808_0x0702Test.cs
@@ -66,21 +66,21 @@ namespace JT808.Protocol.Test.MessageBody
                 LicenseIssuing = "qwertx",
                 CertificateExpiresDate = DateTime.Parse("2018-08-16")
             };
+
             var hex = JT808Serializer.Serialize(jT808_0X0702).ToHexString();
-            Assert.Equal("01 18 08 16 09 16 16 00 05 6B 6F 69 6B 65 71 77 65 31 32 33 34 35 36 61 61 61 30 30 30 30 30 30 30 30 06 71 77 65 72 74 78 20 18 08 16".Replace(" ", ""), hex);
-            //"01 18 08 16 09 16 16 00 05 6B 6F 69 6B 65 71 77 65 31 32 33 34 35 36 61 61 61 30 30 30 30 30 30 30 30 06 71 77 65 72 74 78 20 18 08 16"
+            Assert.Equal("0118081609161600056B6F696B6571776531323334353661616100000000000000000671776572747820180816".Replace(" ", ""), hex);
         }
 
         [Fact]
         public void Test3_1()
         {
-            byte[] bytes = "01 18 08 16 09 16 16 00 05 6B 6F 69 6B 65 71 77 65 31 32 33 34 35 36 61 61 61 30 30 30 30 30 30 30 30 06 71 77 65 72 74 78 20 18 08 16".ToHexBytes();
+            byte[] bytes = "0118081609161600056B6F696B6571776531323334353661616100000000000000000671776572747820180816".ToHexBytes();
             JT808_0x0702 jT808_0X0702 = JT808Serializer.Deserialize<JT808_0x0702>(bytes);
             Assert.Equal(JT808ICCardStatus.从业资格证IC卡插入_驾驶员上班, jT808_0X0702.IC_Card_Status);
             Assert.Equal(DateTime.Parse("2018-08-16 09:16:16"), jT808_0X0702.IC_Card_PlugDateTime);
             Assert.Equal(JT808ICCardReadResult.IC卡读卡成功, jT808_0X0702.IC_Card_ReadResult);
             Assert.Equal("koike", jT808_0X0702.DriverUserName);
-            Assert.Equal("qwe123456aaa00000000", jT808_0X0702.QualificationCode);
+            Assert.Equal("qwe123456aaa", jT808_0X0702.QualificationCode);
             Assert.Equal("qwertx", jT808_0X0702.LicenseIssuing);
             Assert.Equal(DateTime.Parse("2018-08-16"), jT808_0X0702.CertificateExpiresDate);
         }
@@ -100,23 +100,23 @@ namespace JT808.Protocol.Test.MessageBody
                 DriverIdentityCard="12345678901234567"
             };
             var hex = JT808Serializer.Serialize(jT808_0X0702, JT808Version.JTT2019).ToHexString();
-            Assert.Equal("0119120111111100056B6F696B65717765313233343536616161303030303030303006717765727478201912013132333435363738393031323334353637303030", hex);
+            Assert.Equal("0119120111111100056B6F696B65717765313233343536616161000000000000000006717765727478201912013132333435363738393031323334353637000000", hex);
             
         }
 
         [Fact]
         public void Test_2019_2()
         {
-            byte[] bytes = "0119120111111100056B6F696B65717765313233343536616161303030303030303006717765727478201912013132333435363738393031323334353637303030".ToHexBytes();
+            byte[] bytes = "0119120111111100056B6F696B65717765313233343536616161000000000000000006717765727478201912013132333435363738393031323334353637000000".ToHexBytes();
             JT808_0x0702 jT808_0X0702 = JT808Serializer.Deserialize<JT808_0x0702>(bytes, JT808Version.JTT2019);
             Assert.Equal(JT808ICCardStatus.从业资格证IC卡插入_驾驶员上班, jT808_0X0702.IC_Card_Status);
             Assert.Equal(DateTime.Parse("2019-12-01 11:11:11"), jT808_0X0702.IC_Card_PlugDateTime);
             Assert.Equal(JT808ICCardReadResult.IC卡读卡成功, jT808_0X0702.IC_Card_ReadResult);
             Assert.Equal("koike", jT808_0X0702.DriverUserName);
-            Assert.Equal("qwe123456aaa00000000", jT808_0X0702.QualificationCode);
+            Assert.Equal("qwe123456aaa", jT808_0X0702.QualificationCode);
             Assert.Equal("qwertx", jT808_0X0702.LicenseIssuing);
             Assert.Equal(DateTime.Parse("2019-12-01"), jT808_0X0702.CertificateExpiresDate);
-            Assert.Equal("12345678901234567000", jT808_0X0702.DriverIdentityCard);
+            Assert.Equal("12345678901234567", jT808_0X0702.DriverIdentityCard);
         }
 
         [Fact]
diff --git a/src/JT808.Protocol/JT808.Protocol.csproj b/src/JT808.Protocol/JT808.Protocol.csproj
index 014d172..fcc3fa1 100644
--- a/src/JT808.Protocol/JT808.Protocol.csproj
+++ b/src/JT808.Protocol/JT808.Protocol.csproj
@@ -15,7 +15,7 @@
     <license>https://github.com/SmallChi/JT808/blob/master/LICENSE</license>
     <DocumentationFile>JT808.Protocol.xml</DocumentationFile>
     <GeneratePackageOnBuild>false</GeneratePackageOnBuild>
-    <Version>2.3.8</Version>
+    <Version>2.3.9</Version>
     <PackageLicenseFile>LICENSE</PackageLicenseFile>
     <AnalysisLevel>latest</AnalysisLevel>
     <EnableNETAnalyzers>true</EnableNETAnalyzers>
diff --git a/src/JT808.Protocol/MessageBody/JT808_0x0107.cs b/src/JT808.Protocol/MessageBody/JT808_0x0107.cs
index 569d418..ff97cc2 100644
--- a/src/JT808.Protocol/MessageBody/JT808_0x0107.cs
+++ b/src/JT808.Protocol/MessageBody/JT808_0x0107.cs
@@ -143,7 +143,7 @@ namespace JT808.Protocol.MessageBody
             {
                 writer.WriteString(value.MakerId.PadRight(5, '\0').ValiString(nameof(value.MakerId), 5));
                 writer.WriteString(value.TerminalModel.PadRight(20, '\0').ValiString(nameof(value.TerminalModel), 20));
-                writer.WriteString(value.TerminalId.PadRight(7, '0').ValiString(nameof(value.TerminalId), 7));
+                writer.WriteString(value.TerminalId.PadRight(7, '\0').ValiString(nameof(value.TerminalId), 7));
             }
             writer.WriteBCD(value.Terminal_SIM_ICCID.ValiString(nameof(value.Terminal_SIM_ICCID), 20), 20);
             writer.WriteByte((byte)value.Terminal_Hardware_Version_Num.Length);
diff --git a/src/JT808.Protocol/MessageBody/JT808_0x0702.cs b/src/JT808.Protocol/MessageBody/JT808_0x0702.cs
index 19bf720..1dbec23 100644
--- a/src/JT808.Protocol/MessageBody/JT808_0x0702.cs
+++ b/src/JT808.Protocol/MessageBody/JT808_0x0702.cs
@@ -163,13 +163,13 @@ namespace JT808.Protocol.MessageBody
                 {
                     writer.WriteByte((byte)value.DriverUserName.Length);
                     writer.WriteString(value.DriverUserName);
-                    writer.WriteString(value.QualificationCode.PadRight(20, '0').ValiString(nameof(value.QualificationCode),20));
+                    writer.WriteString(value.QualificationCode.PadRight(20, '\0').ValiString(nameof(value.QualificationCode),20));
                     writer.WriteByte((byte)value.LicenseIssuing.Length);
                     writer.WriteString(value.LicenseIssuing);
                     writer.WriteDateTime4(value.CertificateExpiresDate);
                     if (writer.Version == JT808Version.JTT2019)
                     {
-                        writer.WriteString(value.DriverIdentityCard.PadRight(20,'0').ValiString(nameof(value.DriverIdentityCard), 20));
+                        writer.WriteString(value.DriverIdentityCard.PadRight(20,'\0').ValiString(nameof(value.DriverIdentityCard), 20));
                     }
                 }
             }
diff --git a/src/JT808.Protocol/MessageBody/JT808_0x8108.cs b/src/JT808.Protocol/MessageBody/JT808_0x8108.cs
index c810fab..5a378ff 100644
--- a/src/JT808.Protocol/MessageBody/JT808_0x8108.cs
+++ b/src/JT808.Protocol/MessageBody/JT808_0x8108.cs
@@ -81,11 +81,11 @@ namespace JT808.Protocol.MessageBody
             writer.WriteByte((byte)value.UpgradeType);
             if (writer.Version == JT808Version.JTT2019)
             {
-                writer.WriteString(value.MakerId.PadLeft(11, '0'));
+                writer.WriteString(value.MakerId.PadLeft(11, '\0'));
             }
             else
             {
-                writer.WriteString(value.MakerId.PadRight(5, '0'));
+                writer.WriteString(value.MakerId.PadRight(5, '\0'));
             }
             writer.WriteByte((byte)value.VersionNum.Length);
             writer.WriteString(value.VersionNum);