diff --git a/src/JT808.Protocol.Test/MessageBody/JT808_0x0107Test.cs b/src/JT808.Protocol.Test/MessageBody/JT808_0x0107Test.cs
index af1ab96..4d5691a 100644
--- a/src/JT808.Protocol.Test/MessageBody/JT808_0x0107Test.cs
+++ b/src/JT808.Protocol.Test/MessageBody/JT808_0x0107Test.cs
@@ -26,7 +26,7 @@ namespace JT808.Protocol.Test.MessageBody
                 MakerId = "10601",
                 TerminalModel = "10455545955103",
                 TerminalId = "4d6a13",
-                Terminal_SIM_ICCID = "1232355987",
+                Terminal_SIM_ICCID = "12345678901234567890",
                 Terminal_Hardware_Version_Num = "abcdefg",
                 Terminal_Firmware_Version_Num = "poiuytrewq",
                 // 00000111
@@ -36,14 +36,14 @@ namespace JT808.Protocol.Test.MessageBody
             };
             jT808Package.Bodies = jT808_0X0107;
             string hex = JT808Serializer.Serialize(jT808Package).ToHexString();
-            //"7E 01 07 00 3C 11 22 33 44 55 66 22 B8 00 05 31 30 36 30 31 31 30 34 35 35 35 34 35 39 35 35 31 30 33 30 30 30 30 30 30 34 64 36 61 31 33 30 12 32 35 59 87 07 61 62 63 64 65 66 67 0A 70 6F 69 75 79 74 72 65 77 71 07 09 6C 7E"
-            Assert.Equal("7E 01 07 00 3C 11 22 33 44 55 66 22 B8 00 05 31 30 36 30 31 31 30 34 35 35 35 34 35 39 35 35 31 30 33 30 30 30 30 30 30 34 64 36 61 31 33 30 12 32 35 59 87 07 61 62 63 64 65 66 67 0A 70 6F 69 75 79 74 72 65 77 71 07 09 6C 7E".Replace(" ", ""), hex);
+            //"7E0107004111223344556622B8000531303630313130343535353435393535313033303030303030346436613133301234567890123456789007616263646566670A706F69757974726577710709DA7E
+            Assert.Equal("7E0107004111223344556622B8000531303630313130343535353435393535313033303030303030346436613133301234567890123456789007616263646566670A706F69757974726577710709DA7E".Replace(" ", ""), hex);
         }
 
         [Fact]
         public void Test2()
         {
-            byte[] bytes = "7E 01 07 00 3C 11 22 33 44 55 66 22 B8 00 05 31 30 36 30 31 31 30 34 35 35 35 34 35 39 35 35 31 30 33 30 30 30 30 30 30 34 64 36 61 31 33 30 12 32 35 59 87 07 61 62 63 64 65 66 67 0A 70 6F 69 75 79 74 72 65 77 71 07 09 6C 7E".ToHexBytes();
+            byte[] bytes = "7E0107004111223344556622B8000531303630313130343535353435393535313033303030303030346436613133301234567890123456789007616263646566670A706F69757974726577710709DA7E".ToHexBytes();
             JT808Package jT808Package = JT808Serializer.Deserialize(bytes);
             JT808_0x0107 jT808_0X0107 = (JT808_0x0107)jT808Package.Bodies;
             Assert.Equal(8888, jT808Package.Header.MsgNum);
@@ -53,7 +53,7 @@ namespace JT808.Protocol.Test.MessageBody
             Assert.Equal("10601", jT808_0X0107.MakerId);
             Assert.Equal("10455545955103000000", jT808_0X0107.TerminalModel);
             Assert.Equal("4d6a130", jT808_0X0107.TerminalId);
-            Assert.Equal("1232355987", jT808_0X0107.Terminal_SIM_ICCID);
+            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);
             Assert.Equal(7, jT808_0X0107.GNSSModule);
diff --git a/src/JT808.Protocol/MessageBody/JT808_0x0107.cs b/src/JT808.Protocol/MessageBody/JT808_0x0107.cs
index dffdde3..cf02556 100644
--- a/src/JT808.Protocol/MessageBody/JT808_0x0107.cs
+++ b/src/JT808.Protocol/MessageBody/JT808_0x0107.cs
@@ -100,7 +100,7 @@ namespace JT808.Protocol.MessageBody
                 jT808_0X0107.TerminalModel = reader.ReadString(20);
                 jT808_0X0107.TerminalId = reader.ReadString(7);
             }
-            jT808_0X0107.Terminal_SIM_ICCID = reader.ReadBCD(10, config.Trim);
+            jT808_0X0107.Terminal_SIM_ICCID = reader.ReadBCD(20, config.Trim);
             jT808_0X0107.Terminal_Hardware_Version_Length = reader.ReadByte();
             jT808_0X0107.Terminal_Hardware_Version_Num = reader.ReadString(jT808_0X0107.Terminal_Hardware_Version_Length);
             jT808_0X0107.Terminal_Firmware_Version_Length = reader.ReadByte();
@@ -125,7 +125,7 @@ namespace JT808.Protocol.MessageBody
                 writer.WriteString(value.TerminalModel.PadRight(20, '0'));
                 writer.WriteString(value.TerminalId.PadRight(7, '0'));
             }
-            writer.WriteBCD(value.Terminal_SIM_ICCID, 10);
+            writer.WriteBCD(value.Terminal_SIM_ICCID, 20);
             writer.WriteByte((byte)value.Terminal_Hardware_Version_Num.Length);
             writer.WriteString(value.Terminal_Hardware_Version_Num);
             writer.WriteByte((byte)value.Terminal_Firmware_Version_Num.Length);