diff --git a/page.go b/page.go
index 80ce356..1bba65a 100644
--- a/page.go
+++ b/page.go
@@ -48,11 +48,17 @@ func DeSerializePageHead(data []byte) (*PageHead, error) {
 		FirstFreeOffset: FirstFreeOffset,
 	}, nil
 }
+
+// DeSerializePage 从字节数据中反序列化Page结构
+// data: 包含页面数据的字节切片
+// 返回值: 解析出的Page指针和可能的错误
 func DeSerializePage(data []byte) (*Page, error) {
 	head, err := DeSerializePageHead(data[0:BlockFileHeaderSize])
 	if err != nil {
 		return nil, err
 	}
+
+	// 如果没有cell，直接返回空的cells数组
 	if head.CellCount == 0 {
 		return &Page{
 			PageHead: head,
@@ -60,8 +66,10 @@ func DeSerializePage(data []byte) (*Page, error) {
 			data:     data,
 		}, nil
 	}
+
 	cells := make([]*Cell, head.CellCount)
-	// find cell offset array start
+
+	// 查找cell偏移数组的起始位置
 	cellPOffset := 0
 	for i := 17; i < BlockFilePageSize; i++ {
 		t := binary.LittleEndian.Uint32(data[i : i+4])
@@ -74,26 +82,69 @@ func DeSerializePage(data []byte) (*Page, error) {
 	if cellPOffset == 0 {
 		return nil, errors.New("invalid page")
 	}
+
+	previousCellOffset := 0
 	currentFreeOffset := head.FirstFreeOffset
+
+	// 遍历所有cell，解析每个cell的信息
 	for i := 0; i < head.CellCount; i++ {
 		cellOffset := binary.LittleEndian.Uint32(data[cellPOffset+i*4 : cellPOffset+i*4+4])
-		nextOffSet := binary.LittleEndian.Uint32(data[cellOffset : cellOffset+4])
-		cellSize := nextOffSet - cellOffset
+
+		cellSize := 0
+		// cell if from end to start
+		if i == 0 {
+			cellSize = BlockFilePageSize - int(cellOffset)
+		} else {
+			cellSize = int(cellOffset) - int(previousCellOffset)
+		}
+
 		cells[i] = &Cell{
 			IsFree:         false,
 			NextFreeOffset: 0,
 			ActualSize:     int(cellSize),
 			Start:          Offset(cellOffset),
 		}
+
+		// 检查当前cell是否为空闲cell
 		if cellOffset == uint32(currentFreeOffset) {
 			cells[i].IsFree = true
 			cells[i].NextFreeOffset = Offset(binary.LittleEndian.Uint32(data[cellOffset+4 : cellOffset+8]))
 			currentFreeOffset = cells[i].NextFreeOffset
 		}
+		previousCellOffset = int(cellOffset)
 	}
+
 	return &Page{
 		PageHead: head,
 		Cells:    cells,
 		data:     data,
 	}, nil
 }
+
+func (p *Page) Serialize() []byte {
+	// 写入PageHead
+	binary.LittleEndian.PutUint64(p.data[0:8], uint64(p.PageId))
+	p.data[8] = byte(p.Type)
+	p.data[9] = byte(p.CellCount)
+	p.data[10] = byte(p.FirstFreeOffset)
+
+	// 写入Cell偏移数组
+	lastCellOffset := p.Cells[p.CellCount-1].Start
+	cellOffsets := make([]byte, p.CellCount*4)
+	for i, cell := range p.Cells {
+		binary.LittleEndian.PutUint32(cellOffsets[i*4:i*4+4], uint32(cell.Start))
+	}
+	copy(p.data[int(lastCellOffset)-len(cellOffsets):lastCellOffset], cellOffsets)
+	return p.data
+}
+
+func (p *Page) GetCell(index int) *Cell {
+	return p.Cells[index]
+}
+func (p *Page) GetCellData(cell *Cell) []byte {
+	return p.data[cell.Start : cell.Start+Offset(cell.ActualSize)]
+}
+
+func (p *Page) WriteNewCell(data []byte) (*Cell, error) {
+
+}