diff --git a/CodeMatrix/FormMain.cs b/CodeMatrix/FormMain.cs
index bdb8292..df564d2 100644
--- a/CodeMatrix/FormMain.cs
+++ b/CodeMatrix/FormMain.cs
@@ -20,6 +20,10 @@ namespace CodeMatrix
 
             var codeMatrix = new UCCodeMatrix();
             var codeQueue = new UCCodeQueue();
+
+            codeMatrix.HoverValueChangedEvent += (_, value) => codeQueue.HoverCode = value;
+            codeMatrix.CodeSelectedEvent += (_, value) => codeQueue.InputCode(value);
+
             codeQueue.Location = new Point(codeMatrix.Size.Width, 0);
             Controls.Add(codeMatrix);
             Controls.Add(codeQueue);
diff --git a/CodeMatrix/UCCodeMatrix.cs b/CodeMatrix/UCCodeMatrix.cs
index 586143c..bb635e0 100644
--- a/CodeMatrix/UCCodeMatrix.cs
+++ b/CodeMatrix/UCCodeMatrix.cs
@@ -15,8 +15,22 @@ namespace CodeMatrix
         public byte[,] Matrix { get; set; }
         public Point SelectPoint { get; private set; }
         public Point CursorPoint { get; private set; }
-        public Point HoverPoint { get; private set; }
+        private Point _HoverPoint;
+        public Point HoverPoint
+        {
+            get => _HoverPoint;
+            set
+            {
+                _HoverPoint = value;
+                if (HoverPoint.X >= 0)
+                    HoverValueChangedEvent?.Invoke(this, Matrix[HoverPoint.X, HoverPoint.Y]);
+                else
+                    HoverValueChangedEvent?.Invoke(this, 0);
+            }
+        }
         public RectangleF CodeMatrixRect { get; private set; }
+        public event EventHandler<byte> HoverValueChangedEvent;
+        public event EventHandler<byte> CodeSelectedEvent;
 
         /// <summary>
         /// 方向
@@ -179,7 +193,6 @@ namespace CodeMatrix
                         HoverPoint = hoverPoint;
                         Invalidate();
                     }
-                    
                 }
             }
             else
@@ -199,11 +212,11 @@ namespace CodeMatrix
             {
                 SelectPoint = HoverPoint;
                 HoverPoint = new Point(-1, -1);
-                Matrix[SelectPoint.X, SelectPoint.Y] = 0;
                 _currDir = _currDir == Directions.Horizontal ? Directions.Vertical : Directions.Horizontal;
+                CodeSelectedEvent?.Invoke(this, Matrix[SelectPoint.X, SelectPoint.Y]);
+                Matrix[SelectPoint.X, SelectPoint.Y] = 0;
                 Invalidate();
             }
-
             base.OnMouseClick(e);
         }
     }
diff --git a/CodeMatrix/UCCodeQueue.cs b/CodeMatrix/UCCodeQueue.cs
index 43c6cb0..5a1bbb2 100644
--- a/CodeMatrix/UCCodeQueue.cs
+++ b/CodeMatrix/UCCodeQueue.cs
@@ -12,7 +12,16 @@ namespace CodeMatrix
     {
         public Size CellSize { get; private set; }
         public Padding CellMargin { get; set; }
-        public byte HoverCode { get; set; }
+        private byte _HoverCode;
+        public byte HoverCode
+        {
+            get => _HoverCode;
+            set
+            {
+                _HoverCode = value;
+                Invalidate();
+            }
+        }
         public int BufferSize { get; set; }
         public int CurrIndex { get; private set; }
         public byte[] Buffer { get; } = new byte[32];
@@ -28,12 +37,8 @@ namespace CodeMatrix
             CellSize = new Size(25, 25);
             BufferSize = 7;
 
-            CurrIndex = 4;
-            HoverCode = 0x55;
-            Buffer[0] = 0xE9;
-            Buffer[1] = 0x55;
-            Buffer[2] = 0x1C;
-            Buffer[3] = 0xBD;
+            CurrIndex = 0;
+            HoverCode = 0;
         }
 
         private void InitComponent()
@@ -57,34 +62,35 @@ namespace CodeMatrix
                                            CellSize.Width-1,
                                            CellSize.Height-1);
             var cellOffsetWidth = CellSize.Width + CellMargin.Horizontal;
-            int index = 0;
-            for (; index < CurrIndex; index++)
+            for (int i = 0; i < CurrIndex && i < BufferSize; i++)
             {
                 e.Graphics.DrawRectangle(Styles.Default.SelectedCellBorderPen, cellOffset);
-                var code = Buffer[index].ToString("X2");
+                var code = Buffer[i].ToString("X2");
                 var codeSize = e.Graphics.MeasureString(code, Font);
                 var codeOffset = new PointF((CellSize.Width-codeSize.Width)/2, (CellSize.Height-codeSize.Height)/2);
                 var codePoint = new PointF(codeOffset.X+cellOffset.X, codeOffset.Y+cellOffset.Y);
                 e.Graphics.DrawString(code, Font, Styles.Default.CodeBrush, codePoint);
                 cellOffset.X += cellOffsetWidth;
             }
-            if (HoverCode > 0)
+            
+            if (CurrIndex < BufferSize)
             {
                 e.Graphics.DrawRectangle(Styles.Default.SelectCellBorderPen, cellOffset);
-                var code = HoverCode.ToString("X2");
-                var codeSize = e.Graphics.MeasureString(code, Font);
-                var codeOffset = new PointF((CellSize.Width-codeSize.Width)/2, (CellSize.Height-codeSize.Height)/2);
-                var codePoint = new PointF(codeOffset.X+cellOffset.X, codeOffset.Y+cellOffset.Y);
-                e.Graphics.DrawString(code, Font, Styles.Default.SelectBrush, codePoint);
-
-
-                cellOffset.X += cellOffsetWidth;
-                index++;
-            }
-            for (; index < BufferSize; index++)
-            {
-                e.Graphics.DrawRectangle(Styles.Default.EmptyCellBorderPen, cellOffset);
+                if (HoverCode > 0)
+                {
+                    var code = HoverCode.ToString("X2");
+                    var codeSize = e.Graphics.MeasureString(code, Font);
+                    var codeOffset = new PointF((CellSize.Width-codeSize.Width)/2, (CellSize.Height-codeSize.Height)/2);
+                    var codePoint = new PointF(codeOffset.X+cellOffset.X, codeOffset.Y+cellOffset.Y);
+                    e.Graphics.DrawString(code, Font, Styles.Default.SelectBrush, codePoint);
+                }
                 cellOffset.X += cellOffsetWidth;
+
+                for (int i = CurrIndex+1; i < BufferSize; i++)
+                {
+                    e.Graphics.DrawRectangle(Styles.Default.EmptyCellBorderPen, cellOffset);
+                    cellOffset.X += cellOffsetWidth;
+                }
             }
 
 
@@ -92,5 +98,20 @@ namespace CodeMatrix
 
             base.OnPaint(e);
         }
+
+        public void InputCode(byte code)
+        {
+            if (CurrIndex < BufferSize)
+            {
+                Buffer[CurrIndex++] = code;
+                HoverCode = 0;
+            }
+        }
+
+        public void ClearBuffer()
+        {
+            CurrIndex = 0;
+            HoverCode = 0;
+        }
     }
 }