diff --git a/cell.go b/cell.go
index f67319c5..c40012ac 100644
--- a/cell.go
+++ b/cell.go
@@ -9,10 +9,8 @@ import (
 // GetCellValue provides function to get value from cell by given sheet index
 // and axis in XLSX file.
 func (f *File) GetCellValue(sheet, axis string) string {
+	xlsx := f.workSheetReader(sheet)
 	axis = strings.ToUpper(axis)
-	var xlsx xlsxWorksheet
-	name := "xl/worksheets/" + strings.ToLower(sheet) + ".xml"
-	xml.Unmarshal([]byte(f.readXML(name)), &xlsx)
 	if xlsx.MergeCells != nil {
 		for i := 0; i < len(xlsx.MergeCells.Cells); i++ {
 			if checkCellInArea(axis, xlsx.MergeCells.Cells[i].Ref) {
@@ -60,10 +58,8 @@ func (f *File) GetCellValue(sheet, axis string) string {
 // GetCellFormula provides function to get formula from cell by given sheet
 // index and axis in XLSX file.
 func (f *File) GetCellFormula(sheet, axis string) string {
+	xlsx := f.workSheetReader(sheet)
 	axis = strings.ToUpper(axis)
-	var xlsx xlsxWorksheet
-	name := "xl/worksheets/" + strings.ToLower(sheet) + ".xml"
-	xml.Unmarshal([]byte(f.readXML(name)), &xlsx)
 	if xlsx.MergeCells != nil {
 		for i := 0; i < len(xlsx.MergeCells.Cells); i++ {
 			if checkCellInArea(axis, xlsx.MergeCells.Cells[i].Ref) {
@@ -102,18 +98,8 @@ func (f *File) GetCellFormula(sheet, axis string) string {
 // SetCellFormula provides function to set cell formula by given string and
 // sheet index.
 func (f *File) SetCellFormula(sheet, axis, formula string) {
+	xlsx := f.workSheetReader(sheet)
 	axis = strings.ToUpper(axis)
-	var xlsx xlsxWorksheet
-	name := "xl/worksheets/" + strings.ToLower(sheet) + ".xml"
-	xml.Unmarshal([]byte(f.readXML(name)), &xlsx)
-	if f.checked == nil {
-		f.checked = make(map[string]bool)
-	}
-	ok := f.checked[name]
-	if !ok {
-		checkRow(&xlsx)
-		f.checked[name] = true
-	}
 	if xlsx.MergeCells != nil {
 		for i := 0; i < len(xlsx.MergeCells.Cells); i++ {
 			if checkCellInArea(axis, xlsx.MergeCells.Cells[i].Ref) {
@@ -129,8 +115,8 @@ func (f *File) SetCellFormula(sheet, axis, formula string) {
 	rows := xAxis + 1
 	cell := yAxis + 1
 
-	completeRow(&xlsx, rows, cell)
-	completeCol(&xlsx, rows, cell)
+	completeRow(xlsx, rows, cell)
+	completeCol(xlsx, rows, cell)
 
 	if xlsx.SheetData.Row[xAxis].C[yAxis].F != nil {
 		xlsx.SheetData.Row[xAxis].C[yAxis].F.Content = formula
@@ -140,25 +126,13 @@ func (f *File) SetCellFormula(sheet, axis, formula string) {
 		}
 		xlsx.SheetData.Row[xAxis].C[yAxis].F = &f
 	}
-	output, _ := xml.Marshal(xlsx)
-	f.saveFileList(name, replaceWorkSheetsRelationshipsNameSpace(string(output)))
 }
 
 // SetCellHyperLink provides function to set cell hyperlink by given sheet index
 // and link URL address. Only support external link currently.
 func (f *File) SetCellHyperLink(sheet, axis, link string) {
+	xlsx := f.workSheetReader(sheet)
 	axis = strings.ToUpper(axis)
-	var xlsx xlsxWorksheet
-	name := "xl/worksheets/" + strings.ToLower(sheet) + ".xml"
-	xml.Unmarshal([]byte(f.readXML(name)), &xlsx)
-	if f.checked == nil {
-		f.checked = make(map[string]bool)
-	}
-	ok := f.checked[name]
-	if !ok {
-		checkRow(&xlsx)
-		f.checked[name] = true
-	}
 	if xlsx.MergeCells != nil {
 		for i := 0; i < len(xlsx.MergeCells.Cells); i++ {
 			if checkCellInArea(axis, xlsx.MergeCells.Cells[i].Ref) {
@@ -178,8 +152,6 @@ func (f *File) SetCellHyperLink(sheet, axis, link string) {
 		hyperlinks.Hyperlink = append(hyperlinks.Hyperlink, hyperlink)
 		xlsx.Hyperlinks = &hyperlinks
 	}
-	output, _ := xml.Marshal(xlsx)
-	f.saveFileList(name, replaceWorkSheetsRelationshipsNameSpace(string(output)))
 }
 
 // MergeCell provides function to merge cells by given coordinate area and sheet
@@ -218,17 +190,7 @@ func (f *File) MergeCell(sheet, hcell, vcell string) {
 		vyAxis, hyAxis = hyAxis, vyAxis
 	}
 
-	var xlsx xlsxWorksheet
-	name := "xl/worksheets/" + strings.ToLower(sheet) + ".xml"
-	xml.Unmarshal([]byte(f.readXML(name)), &xlsx)
-	if f.checked == nil {
-		f.checked = make(map[string]bool)
-	}
-	ok := f.checked[name]
-	if !ok {
-		checkRow(&xlsx)
-		f.checked[name] = true
-	}
+	xlsx := f.workSheetReader(sheet)
 	if xlsx.MergeCells != nil {
 		mergeCell := xlsxMergeCell{}
 		// Correct the coordinate area, such correct C1:B3 to B1:C3.
@@ -250,8 +212,6 @@ func (f *File) MergeCell(sheet, hcell, vcell string) {
 		mergeCells.Cells = append(mergeCells.Cells, &mergeCell)
 		xlsx.MergeCells = &mergeCells
 	}
-	output, _ := xml.Marshal(xlsx)
-	f.saveFileList(name, replaceWorkSheetsRelationshipsNameSpace(string(output)))
 }
 
 // checkCellInArea provides function to determine if a given coordinate is
diff --git a/col.go b/col.go
index 4d8f7a37..cb1c3b43 100644
--- a/col.go
+++ b/col.go
@@ -1,7 +1,6 @@
 package excelize
 
 import (
-	"encoding/xml"
 	"math"
 	"strconv"
 	"strings"
@@ -31,9 +30,7 @@ func (f *File) SetColWidth(sheet, startcol, endcol string, width float64) {
 	if min > max {
 		min, max = max, min
 	}
-	var xlsx xlsxWorksheet
-	name := "xl/worksheets/" + strings.ToLower(sheet) + ".xml"
-	xml.Unmarshal([]byte(f.readXML(name)), &xlsx)
+	xlsx := f.workSheetReader(sheet)
 	col := xlsxCol{
 		Min:         min,
 		Max:         max,
@@ -47,8 +44,6 @@ func (f *File) SetColWidth(sheet, startcol, endcol string, width float64) {
 		cols.Col = append(cols.Col, col)
 		xlsx.Cols = &cols
 	}
-	output, _ := xml.Marshal(xlsx)
-	f.saveFileList(name, replaceWorkSheetsRelationshipsNameSpace(string(output)))
 }
 
 // positionObjectPixels calculate the vertices that define the position of a
@@ -160,9 +155,7 @@ func (f *File) positionObjectPixels(sheet string, colStart, rowStart, x1, y1, wi
 // getColWidth provides function to get column width in pixels by given sheet
 // name and column index.
 func (f *File) getColWidth(sheet string, col int) int {
-	var xlsx xlsxWorksheet
-	name := "xl/worksheets/" + strings.ToLower(sheet) + ".xml"
-	xml.Unmarshal([]byte(f.readXML(name)), &xlsx)
+	xlsx := f.workSheetReader(sheet)
 	if xlsx.Cols != nil {
 		var width float64
 		for _, v := range xlsx.Cols.Col {
@@ -181,9 +174,7 @@ func (f *File) getColWidth(sheet string, col int) int {
 // getRowHeight provides function to get row height in pixels by given sheet
 // name and row index.
 func (f *File) getRowHeight(sheet string, row int) int {
-	var xlsx xlsxWorksheet
-	name := "xl/worksheets/" + strings.ToLower(sheet) + ".xml"
-	xml.Unmarshal([]byte(f.readXML(name)), &xlsx)
+	xlsx := f.workSheetReader(sheet)
 	for _, v := range xlsx.SheetData.Row {
 		if v.R == row && v.Ht != "" {
 			ht, _ := strconv.ParseFloat(v.Ht, 64)
diff --git a/excelize.go b/excelize.go
index 62456ee6..1fbfcc21 100644
--- a/excelize.go
+++ b/excelize.go
@@ -16,6 +16,7 @@ type File struct {
 	checked    map[string]bool
 	XLSX       map[string]string
 	Path       string
+	Sheet      map[string]*xlsxWorksheet
 	SheetCount int
 }
 
@@ -52,6 +53,7 @@ func OpenReader(r io.Reader) (*File, error) {
 		return nil, err
 	}
 	return &File{
+		Sheet:      make(map[string]*xlsxWorksheet),
 		checked:    make(map[string]bool),
 		XLSX:       file,
 		Path:       "",
@@ -85,21 +87,32 @@ func (f *File) SetCellValue(sheet, axis string, value interface{}) {
 	}
 }
 
+// workSheetReader provides function to get the pointer to the structure after
+// deserialization by given worksheet index.
+func (f *File) workSheetReader(sheet string) *xlsxWorksheet {
+	name := "xl/worksheets/" + strings.ToLower(sheet) + ".xml"
+	worksheet := f.Sheet[name]
+	if worksheet == nil {
+		var xlsx xlsxWorksheet
+		xml.Unmarshal([]byte(f.readXML(name)), &xlsx)
+		if f.checked == nil {
+			f.checked = make(map[string]bool)
+		}
+		ok := f.checked[name]
+		if !ok {
+			checkRow(&xlsx)
+			f.checked[name] = true
+		}
+		f.Sheet[name] = &xlsx
+		worksheet = f.Sheet[name]
+	}
+	return worksheet
+}
+
 // SetCellInt provides function to set int type value of a cell.
 func (f *File) SetCellInt(sheet, axis string, value int) {
+	xlsx := f.workSheetReader(sheet)
 	axis = strings.ToUpper(axis)
-	var xlsx xlsxWorksheet
-	name := "xl/worksheets/" + strings.ToLower(sheet) + ".xml"
-	xml.Unmarshal([]byte(f.readXML(name)), &xlsx)
-	if f.checked == nil {
-		f.checked = make(map[string]bool)
-	}
-	ok := f.checked[name]
-	if !ok {
-		checkRow(&xlsx)
-		f.checked[name] = true
-	}
-
 	if xlsx.MergeCells != nil {
 		for i := 0; i < len(xlsx.MergeCells.Cells); i++ {
 			if checkCellInArea(axis, xlsx.MergeCells.Cells[i].Ref) {
@@ -115,31 +128,18 @@ func (f *File) SetCellInt(sheet, axis string, value int) {
 	rows := xAxis + 1
 	cell := yAxis + 1
 
-	completeRow(&xlsx, rows, cell)
-	completeCol(&xlsx, rows, cell)
+	completeRow(xlsx, rows, cell)
+	completeCol(xlsx, rows, cell)
 
 	xlsx.SheetData.Row[xAxis].C[yAxis].T = ""
 	xlsx.SheetData.Row[xAxis].C[yAxis].V = strconv.Itoa(value)
-
-	output, _ := xml.Marshal(xlsx)
-	f.saveFileList(name, replaceWorkSheetsRelationshipsNameSpace(string(output)))
 }
 
 // SetCellStr provides function to set string type value of a cell. Total number
 // of characters that a cell can contain 32767 characters.
 func (f *File) SetCellStr(sheet, axis, value string) {
+	xlsx := f.workSheetReader(sheet)
 	axis = strings.ToUpper(axis)
-	var xlsx xlsxWorksheet
-	name := "xl/worksheets/" + strings.ToLower(sheet) + ".xml"
-	xml.Unmarshal([]byte(f.readXML(name)), &xlsx)
-	if f.checked == nil {
-		f.checked = make(map[string]bool)
-	}
-	ok := f.checked[name]
-	if !ok {
-		checkRow(&xlsx)
-		f.checked[name] = true
-	}
 	if xlsx.MergeCells != nil {
 		for i := 0; i < len(xlsx.MergeCells.Cells); i++ {
 			if checkCellInArea(axis, xlsx.MergeCells.Cells[i].Ref) {
@@ -158,31 +158,18 @@ func (f *File) SetCellStr(sheet, axis, value string) {
 	rows := xAxis + 1
 	cell := yAxis + 1
 
-	completeRow(&xlsx, rows, cell)
-	completeCol(&xlsx, rows, cell)
+	completeRow(xlsx, rows, cell)
+	completeCol(xlsx, rows, cell)
 
 	xlsx.SheetData.Row[xAxis].C[yAxis].T = "str"
 	xlsx.SheetData.Row[xAxis].C[yAxis].V = value
-
-	output, _ := xml.Marshal(xlsx)
-	f.saveFileList(name, replaceWorkSheetsRelationshipsNameSpace(string(output)))
 }
 
 // SetCellDefault provides function to set string type value of a cell as
 // default format without escaping the cell.
 func (f *File) SetCellDefault(sheet, axis, value string) {
+	xlsx := f.workSheetReader(sheet)
 	axis = strings.ToUpper(axis)
-	var xlsx xlsxWorksheet
-	name := "xl/worksheets/" + strings.ToLower(sheet) + ".xml"
-	xml.Unmarshal([]byte(f.readXML(name)), &xlsx)
-	if f.checked == nil {
-		f.checked = make(map[string]bool)
-	}
-	ok := f.checked[name]
-	if !ok {
-		checkRow(&xlsx)
-		f.checked[name] = true
-	}
 	if xlsx.MergeCells != nil {
 		for i := 0; i < len(xlsx.MergeCells.Cells); i++ {
 			if checkCellInArea(axis, xlsx.MergeCells.Cells[i].Ref) {
@@ -198,14 +185,11 @@ func (f *File) SetCellDefault(sheet, axis, value string) {
 	rows := xAxis + 1
 	cell := yAxis + 1
 
-	completeRow(&xlsx, rows, cell)
-	completeCol(&xlsx, rows, cell)
+	completeRow(xlsx, rows, cell)
+	completeCol(xlsx, rows, cell)
 
 	xlsx.SheetData.Row[xAxis].C[yAxis].T = ""
 	xlsx.SheetData.Row[xAxis].C[yAxis].V = value
-
-	output, _ := xml.Marshal(xlsx)
-	f.saveFileList(name, replaceWorkSheetsRelationshipsNameSpace(string(output)))
 }
 
 // Completion column element tags of XML in a sheet.
@@ -364,9 +348,7 @@ func checkRow(xlsx *xlsxWorksheet) {
 //
 func (f *File) UpdateLinkedValue() {
 	for i := 1; i <= f.SheetCount; i++ {
-		var xlsx xlsxWorksheet
-		name := "xl/worksheets/sheet" + strconv.Itoa(i) + ".xml"
-		xml.Unmarshal([]byte(f.readXML(name)), &xlsx)
+		xlsx := f.workSheetReader("sheet" + strconv.Itoa(i))
 		for indexR, row := range xlsx.SheetData.Row {
 			for indexC, col := range row.C {
 				if col.F != nil && col.V != "" {
@@ -375,7 +357,5 @@ func (f *File) UpdateLinkedValue() {
 				}
 			}
 		}
-		output, _ := xml.Marshal(xlsx)
-		f.saveFileList(name, replaceWorkSheetsRelationshipsNameSpace(string(output)))
 	}
 }
diff --git a/file.go b/file.go
index 17a8bbaa..aea7f8ea 100644
--- a/file.go
+++ b/file.go
@@ -3,6 +3,7 @@ package excelize
 import (
 	"archive/zip"
 	"bytes"
+	"encoding/xml"
 	"fmt"
 	"io"
 	"os"
@@ -25,7 +26,8 @@ func CreateFile() *File {
 	file["xl/workbook.xml"] = templateWorkbook
 	file["[Content_Types].xml"] = templateContentTypes
 	return &File{
-		XLSX: file,
+		XLSX:  file,
+		Sheet: make(map[string]*xlsxWorksheet),
 	}
 }
 
@@ -52,6 +54,16 @@ func (f *File) WriteTo(name string) error {
 func (f *File) Write(w io.Writer) error {
 	buf := new(bytes.Buffer)
 	zw := zip.NewWriter(buf)
+	for path, sheet := range f.Sheet {
+		if sheet == nil {
+			continue
+		}
+		output, err := xml.Marshal(sheet)
+		if err != nil {
+			return err
+		}
+		f.saveFileList(path, replaceWorkSheetsRelationshipsNameSpace(string(output)))
+	}
 	for path, content := range f.XLSX {
 		fi, err := zw.Create(path)
 		if err != nil {
diff --git a/picture.go b/picture.go
index fc4eda75..ab24f326 100644
--- a/picture.go
+++ b/picture.go
@@ -87,9 +87,7 @@ func (f *File) AddPicture(sheet, cell, picture, format string) error {
 	_, file := filepath.Split(picture)
 	formatSet := parseFormatPictureSet(format)
 	// Read sheet data.
-	var xlsx xlsxWorksheet
-	name := "xl/worksheets/" + strings.ToLower(sheet) + ".xml"
-	xml.Unmarshal([]byte(f.readXML(name)), &xlsx)
+	xlsx := f.workSheetReader(sheet)
 	// Add first picture for given sheet, create xl/drawings/ and xl/drawings/_rels/ folder.
 	drawingID := f.countDrawings() + 1
 	pictureID := f.countMedia() + 1
@@ -149,33 +147,19 @@ func (f *File) addSheetRelationships(sheet, relType, target, targetMode string)
 // addSheetDrawing provides function to add drawing element to
 // xl/worksheets/sheet%d.xml by given sheet name and relationship index.
 func (f *File) addSheetDrawing(sheet string, rID int) {
-	var xlsx xlsxWorksheet
-	name := "xl/worksheets/" + strings.ToLower(sheet) + ".xml"
-	xml.Unmarshal([]byte(f.readXML(name)), &xlsx)
+	xlsx := f.workSheetReader(sheet)
 	xlsx.Drawing = &xlsxDrawing{
 		RID: "rId" + strconv.Itoa(rID),
 	}
-	output, err := xml.Marshal(xlsx)
-	if err != nil {
-		fmt.Println(err)
-	}
-	f.saveFileList(name, replaceWorkSheetsRelationshipsNameSpace(string(output)))
 }
 
 // addSheetPicture provides function to add picture element to
 // xl/worksheets/sheet%d.xml by given sheet name and relationship index.
 func (f *File) addSheetPicture(sheet string, rID int) {
-	var xlsx xlsxWorksheet
-	name := "xl/worksheets/" + strings.ToLower(sheet) + ".xml"
-	xml.Unmarshal([]byte(f.readXML(name)), &xlsx)
+	xlsx := f.workSheetReader(sheet)
 	xlsx.Picture = &xlsxPicture{
 		RID: "rId" + strconv.Itoa(rID),
 	}
-	output, err := xml.Marshal(xlsx)
-	if err != nil {
-		fmt.Println(err)
-	}
-	f.saveFileList(name, replaceWorkSheetsRelationshipsNameSpace(string(output)))
 }
 
 // countDrawings provides function to get drawing files count storage in the
diff --git a/rows.go b/rows.go
index ad33a368..b76a8230 100644
--- a/rows.go
+++ b/rows.go
@@ -17,13 +17,15 @@ import (
 //    }
 //
 func (f *File) GetRows(sheet string) [][]string {
+	xlsx := f.workSheetReader(sheet)
 	rows := [][]string{}
 	name := "xl/worksheets/" + strings.ToLower(sheet) + ".xml"
-	decoder := xml.NewDecoder(strings.NewReader(f.readXML(name)))
-	d, err := readXMLSST(f)
-	if err != nil {
-		return rows
+	if xlsx != nil {
+		output, _ := xml.Marshal(f.Sheet[name])
+		f.saveFileList(name, replaceWorkSheetsRelationshipsNameSpace(string(output)))
 	}
+	decoder := xml.NewDecoder(strings.NewReader(f.readXML(name)))
+	d, _ := readXMLSST(f)
 	var inElement string
 	var r xlsxRow
 	var row []string
@@ -105,20 +107,12 @@ func (f *File) getTotalRowsCols(sheet string) (int, int) {
 //    }
 //
 func (f *File) SetRowHeight(sheet string, rowIndex int, height float64) {
-	xlsx := xlsxWorksheet{}
-	name := "xl/worksheets/" + strings.ToLower(sheet) + ".xml"
-	xml.Unmarshal([]byte(f.readXML(name)), &xlsx)
-
+	xlsx := f.workSheetReader(sheet)
 	rows := rowIndex + 1
 	cells := 0
-
-	completeRow(&xlsx, rows, cells)
-
+	completeRow(xlsx, rows, cells)
 	xlsx.SheetData.Row[rowIndex].Ht = strconv.FormatFloat(height, 'f', -1, 64)
 	xlsx.SheetData.Row[rowIndex].CustomHeight = true
-
-	output, _ := xml.Marshal(xlsx)
-	f.saveFileList(name, replaceWorkSheetsRelationshipsNameSpace(string(output)))
 }
 
 // readXMLSST read xmlSST simple function.
diff --git a/sheet.go b/sheet.go
index 156d7384..e317b93e 100644
--- a/sheet.go
+++ b/sheet.go
@@ -22,9 +22,9 @@ func (f *File) NewSheet(index int, name string) {
 	// Create new sheet /xl/worksheets/sheet%d.xml
 	f.setSheet(index)
 	// Update xl/_rels/workbook.xml.rels
-	rid := f.addXlsxWorkbookRels(index)
+	rID := f.addXlsxWorkbookRels(index)
 	// Update xl/workbook.xml
-	f.setWorkbook(name, rid)
+	f.setWorkbook(name, rID)
 }
 
 // Read and update property of contents type of XLSX.
@@ -49,12 +49,8 @@ func (f *File) setSheet(index int) {
 	xlsx.SheetViews.SheetView = append(xlsx.SheetViews.SheetView, xlsxSheetView{
 		WorkbookViewID: 0,
 	})
-	output, err := xml.Marshal(xlsx)
-	if err != nil {
-		fmt.Println(err)
-	}
 	path := "xl/worksheets/sheet" + strconv.Itoa(index) + ".xml"
-	f.saveFileList(path, replaceWorkSheetsRelationshipsNameSpace(string(output)))
+	f.Sheet[path] = &xlsx
 }
 
 // setWorkbook update workbook property of XLSX. Maximum 31 characters are
@@ -151,14 +147,9 @@ func (f *File) SetActiveSheet(index int) {
 	}
 	f.saveFileList("xl/workbook.xml", replaceRelationshipsNameSpace(string(output)))
 	index++
-	buffer := bytes.Buffer{}
 	for i := 0; i < sheets; i++ {
-		xlsx := xlsxWorksheet{}
 		sheetIndex := i + 1
-		buffer.WriteString("xl/worksheets/sheet")
-		buffer.WriteString(strconv.Itoa(sheetIndex))
-		buffer.WriteString(".xml")
-		xml.Unmarshal([]byte(f.readXML(buffer.String())), &xlsx)
+		xlsx := f.workSheetReader("sheet" + strconv.Itoa(sheetIndex))
 		if index == sheetIndex {
 			if len(xlsx.SheetViews.SheetView) > 0 {
 				xlsx.SheetViews.SheetView[0].TabSelected = true
@@ -172,12 +163,6 @@ func (f *File) SetActiveSheet(index int) {
 				xlsx.SheetViews.SheetView[0].TabSelected = false
 			}
 		}
-		sheet, err := xml.Marshal(xlsx)
-		if err != nil {
-			fmt.Println(err)
-		}
-		f.saveFileList(buffer.String(), replaceWorkSheetsRelationshipsNameSpace(string(sheet)))
-		buffer.Reset()
 	}
 	return
 }
@@ -275,10 +260,6 @@ func (f *File) SetSheetBackground(sheet, picture string) error {
 	if !ok {
 		return errors.New("Unsupported image extension")
 	}
-	// Read sheet data.
-	var xlsx xlsxWorksheet
-	name := "xl/worksheets/" + strings.ToLower(sheet) + ".xml"
-	xml.Unmarshal([]byte(f.readXML(name)), &xlsx)
 	pictureID := f.countMedia() + 1
 	rID := f.addSheetRelationships(sheet, SourceRelationshipImage, "../media/image"+strconv.Itoa(pictureID)+ext, "")
 	f.addSheetPicture(sheet, rID)
diff --git a/styles.go b/styles.go
index cac92a04..f572f84d 100644
--- a/styles.go
+++ b/styles.go
@@ -196,20 +196,10 @@ func (f *File) setCellStyle(sheet, hcell, vcell string, styleID int) {
 	hcell = toAlphaString(hxAxis+1) + strconv.Itoa(hyAxis+1)
 	vcell = toAlphaString(vxAxis+1) + strconv.Itoa(vyAxis+1)
 
-	var xlsx xlsxWorksheet
-	name := "xl/worksheets/" + strings.ToLower(sheet) + ".xml"
-	xml.Unmarshal([]byte(f.readXML(name)), &xlsx)
-	if f.checked == nil {
-		f.checked = make(map[string]bool)
-	}
-	ok := f.checked[name]
-	if !ok {
-		checkRow(&xlsx)
-		f.checked[name] = true
-	}
+	xlsx := f.workSheetReader(sheet)
 
-	completeRow(&xlsx, vxAxis+1, vyAxis+1)
-	completeCol(&xlsx, vxAxis+1, vyAxis+1)
+	completeRow(xlsx, vxAxis+1, vyAxis+1)
+	completeCol(xlsx, vxAxis+1, vyAxis+1)
 
 	for r, row := range xlsx.SheetData.Row {
 		for k, c := range row.C {
@@ -218,6 +208,4 @@ func (f *File) setCellStyle(sheet, hcell, vcell string, styleID int) {
 			}
 		}
 	}
-	output, _ := xml.Marshal(xlsx)
-	f.saveFileList(name, replaceWorkSheetsRelationshipsNameSpace(string(output)))
 }