diff --git a/styles.go b/styles.go
index a2d021f267..c1587aea0e 100644
--- a/styles.go
+++ b/styles.go
@@ -1032,6 +1032,7 @@ func (f *File) NewStyle(style *Style) (int, error) {
 	return setCellXfs(s, fontID, numFmtID, fillID, borderID, applyAlignment, applyProtection, alignment, protection)
 }
 
+// getXfIDFuncs provides a function to get xfID by given style.
 var getXfIDFuncs = map[string]func(int, xlsxXf, *Style) bool{
 	"numFmt": func(numFmtID int, xf xlsxXf, style *Style) bool {
 		if style.CustomNumFmt == nil && numFmtID == -1 {
@@ -1121,7 +1122,10 @@ func (f *File) NewConditionalStyle(style *Style) (int, error) {
 	if err != nil {
 		return 0, err
 	}
-	dxf := dxf{
+	if fs.DecimalPlaces != nil && (*fs.DecimalPlaces < 0 || *fs.DecimalPlaces > 30) {
+		fs.DecimalPlaces = intPtr(2)
+	}
+	dxf := xlsxDxf{
 		Fill: newFills(fs, false),
 	}
 	if fs.Alignment != nil {
@@ -1133,17 +1137,55 @@ func (f *File) NewConditionalStyle(style *Style) (int, error) {
 	if fs.Font != nil {
 		dxf.Font, _ = f.newFont(fs)
 	}
-	dxfStr, _ := xml.Marshal(dxf)
+	if fs.Protection != nil {
+		dxf.Protection = newProtection(fs)
+	}
+	dxf.NumFmt = newDxfNumFmt(s, style, &dxf)
 	if s.Dxfs == nil {
 		s.Dxfs = &xlsxDxfs{}
 	}
 	s.Dxfs.Count++
-	s.Dxfs.Dxfs = append(s.Dxfs.Dxfs, &xlsxDxf{
-		Dxf: string(dxfStr[5 : len(dxfStr)-6]),
-	})
+	s.Dxfs.Dxfs = append(s.Dxfs.Dxfs, &dxf)
 	return s.Dxfs.Count - 1, nil
 }
 
+// newDxfNumFmt provides a function to create number format for conditional
+// format styles.
+func newDxfNumFmt(styleSheet *xlsxStyleSheet, style *Style, dxf *xlsxDxf) *xlsxNumFmt {
+	dp, numFmtID := "0", 164 // Default custom number format code from 164.
+	if style.DecimalPlaces != nil && *style.DecimalPlaces > 0 {
+		dp += "."
+		for i := 0; i < *style.DecimalPlaces; i++ {
+			dp += "0"
+		}
+	}
+	if style.CustomNumFmt != nil {
+		if styleSheet.Dxfs != nil {
+			for _, d := range styleSheet.Dxfs.Dxfs {
+				if d != nil && d.NumFmt != nil && d.NumFmt.NumFmtID > numFmtID {
+					numFmtID = d.NumFmt.NumFmtID
+				}
+			}
+		}
+		return &xlsxNumFmt{NumFmtID: numFmtID + 1, FormatCode: *style.CustomNumFmt}
+	}
+	numFmtCode, ok := builtInNumFmt[style.NumFmt]
+	if style.NumFmt > 0 && ok {
+		return &xlsxNumFmt{NumFmtID: style.NumFmt, FormatCode: numFmtCode}
+	}
+	fc, currency := currencyNumFmt[style.NumFmt]
+	if !currency {
+		return nil
+	}
+	if style.DecimalPlaces != nil {
+		fc = strings.ReplaceAll(fc, "0.00", dp)
+	}
+	if style.NegRed {
+		fc = fc + ";[Red]" + fc
+	}
+	return &xlsxNumFmt{NumFmtID: numFmtID, FormatCode: fc}
+}
+
 // GetDefaultFont provides the default font name currently set in the
 // workbook. The spreadsheet generated by excelize default font is Calibri.
 func (f *File) GetDefaultFont() (string, error) {
diff --git a/styles_test.go b/styles_test.go
index af9654fba6..856e90f03c 100644
--- a/styles_test.go
+++ b/styles_test.go
@@ -355,10 +355,26 @@ func TestNewStyle(t *testing.T) {
 
 func TestNewConditionalStyle(t *testing.T) {
 	f := NewFile()
+	_, err := f.NewConditionalStyle(&Style{Protection: &Protection{Hidden: true, Locked: true}})
+	assert.NoError(t, err)
+	_, err = f.NewConditionalStyle(&Style{DecimalPlaces: intPtr(4), NumFmt: 165, NegRed: true})
+	assert.NoError(t, err)
+	_, err = f.NewConditionalStyle(&Style{DecimalPlaces: intPtr(-1)})
+	assert.NoError(t, err)
+	_, err = f.NewConditionalStyle(&Style{NumFmt: 1})
+	assert.NoError(t, err)
+	_, err = f.NewConditionalStyle(&Style{NumFmt: 27})
+	assert.NoError(t, err)
+	numFmt := "general"
+	_, err = f.NewConditionalStyle(&Style{CustomNumFmt: &numFmt})
+	assert.NoError(t, err)
+	numFmt1 := "0.00"
+	_, err = f.NewConditionalStyle(&Style{CustomNumFmt: &numFmt1})
+	assert.NoError(t, err)
 	// Test create conditional style with unsupported charset style sheet
 	f.Styles = nil
 	f.Pkg.Store(defaultXMLPathStyles, MacintoshCyrillicCharset)
-	_, err := f.NewConditionalStyle(&Style{Font: &Font{Color: "9A0511"}, Fill: Fill{Type: "pattern", Color: []string{"FEC7CE"}, Pattern: 1}})
+	_, err = f.NewConditionalStyle(&Style{Font: &Font{Color: "9A0511"}, Fill: Fill{Type: "pattern", Color: []string{"FEC7CE"}, Pattern: 1}})
 	assert.EqualError(t, err, "XML syntax error on line 1: invalid UTF-8")
 }
 
diff --git a/xmlStyles.go b/xmlStyles.go
index 80d9959404..067cff92d4 100644
--- a/xmlStyles.go
+++ b/xmlStyles.go
@@ -251,11 +251,6 @@ type xlsxDxfs struct {
 // xlsxDxf directly maps the dxf element. A single dxf record, expressing
 // incremental formatting to be applied.
 type xlsxDxf struct {
-	Dxf string `xml:",innerxml"`
-}
-
-// dxf directly maps the dxf element.
-type dxf struct {
 	Font       *xlsxFont       `xml:"font"`
 	NumFmt     *xlsxNumFmt     `xml:"numFmt"`
 	Fill       *xlsxFill       `xml:"fill"`