diff --git a/src/JT1078.FMp4/Boxs/AVCConfigurationBox.cs b/src/JT1078.FMp4/Boxs/AVCConfigurationBox.cs
index d2c71b2..364a98b 100644
--- a/src/JT1078.FMp4/Boxs/AVCConfigurationBox.cs
+++ b/src/JT1078.FMp4/Boxs/AVCConfigurationBox.cs
@@ -17,27 +17,33 @@ namespace JT1078.FMp4
         public AVCConfigurationBox() : base("avcC")
         {
         }
-
+        #region 
+        //public const int LengthSizeMinusOnePaddingBits = 63;
+        //public const int NumberOfSequenceParameterSetsPaddingBits = 7;
+        //public const int ChromaFormatPaddingBits = 31;
+        //public const int BitDepthLumaMinus8PaddingBits = 31;
+        //public const int BitDepthChromaMinus8PaddingBits = 31;
+        #endregion
         //AVCDecoderConfigurationRecord 结构的定义：
         //aligned(8) class AVCDecoderConfigurationRecord
         //{
-            //unsigned int (8) configurationVersion = 1;
-            //unsigned int (8) AVCProfileIndication;
-            //unsigned int (8) profile_compatibility;
-            //unsigned int (8) AVCLevelIndication;
-            //bit(6) reserved = ‘111111’b;
-            //unsigned int (2) lengthSizeMinusOne;
-            //bit(3) reserved = ‘111’b;
-            //unsigned int (5) numOfSequenceParameterSets;
-            //for (i=0; i<numOfSequenceParameterSets; i++) {
-                //unsigned int (16) sequenceParameterSetLength ;
-                //bit(8*sequenceParameterSetLength) sequenceParameterSetNALUnit;
-            //}
-            //unsigned int (8) numOfPictureParameterSets;
-            //for (i=0; i<numOfPictureParameterSets; i++) {
-                //unsigned int (16) pictureParameterSetLength;
-                //bit(8*pictureParameterSetLength) pictureParameterSetNALUnit;
-            //}
+        //unsigned int (8) configurationVersion = 1;
+        //unsigned int (8) AVCProfileIndication;
+        //unsigned int (8) profile_compatibility;
+        //unsigned int (8) AVCLevelIndication;
+        //bit(6) reserved = ‘111111’b;
+        //unsigned int (2) lengthSizeMinusOne;
+        //bit(3) reserved = ‘111’b;
+        //unsigned int (5) numOfSequenceParameterSets;
+        //for (i=0; i<numOfSequenceParameterSets; i++) {
+        //unsigned int (16) sequenceParameterSetLength ;
+        //bit(8*sequenceParameterSetLength) sequenceParameterSetNALUnit;
+        //}
+        //unsigned int (8) numOfPictureParameterSets;
+        //for (i=0; i<numOfPictureParameterSets; i++) {
+        //unsigned int (16) pictureParameterSetLength;
+        //bit(8*pictureParameterSetLength) pictureParameterSetNALUnit;
+        //}
         //}
         public byte ConfigurationVersion { get; set; } = 1;
         public byte AVCProfileIndication { get; set; }
@@ -45,18 +51,26 @@ namespace JT1078.FMp4
         public byte AVCLevelIndication { get; set; }
         public int LengthSizeMinusOne { get; set; }
         public int NumOfSequenceParameterSets { get; set; }
-        public List<(ushort SequenceParameterSetLength,byte[] SequenceParameterSetNALUnit)> SPS { get; set; }
+        //public List<(ushort SequenceParameterSetLength,byte[] SequenceParameterSetNALUnit)> SPS { get; set; }
         public byte[] SPSBuffer { get; set; }
         public byte NumOfPictureParameterSets { get; set; } = 1;
-        public List<(ushort PictureParameterSetLength,byte[] PictureParameterSetNALUnit)> PPS { get; set; }
+        //public List<(ushort PictureParameterSetLength,byte[] PictureParameterSetNALUnit)> PPS { get; set; }
         public byte[] PPSBuffer { get; set; }
 
         public void ToBuffer(ref FMp4MessagePackWriter writer)
         {
             Start(ref writer);
-            //todo:AVCConfigurationBox
-
-
+            writer.WriteByte(ConfigurationVersion);
+            writer.WriteByte(AVCProfileIndication);
+            writer.WriteByte(ProfileCompatibility);
+            writer.WriteByte(AVCLevelIndication);
+            writer.WriteByte((byte)(0xfc | LengthSizeMinusOne));
+            writer.WriteByte((byte)(0xE0 | NumOfSequenceParameterSets));
+            writer.WriteUInt16((ushort)SPSBuffer.Length);
+            writer.WriteArray(SPSBuffer);
+            writer.WriteByte(NumOfPictureParameterSets);
+            writer.WriteUInt16((ushort)PPSBuffer.Length);
+            writer.WriteArray(PPSBuffer);
             End(ref writer);
         }
     }