diff --git a/README.md b/README.md
index 9d3b883..aacbf41 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,7 @@ excel的导出导入（目前仅完成导出）
 ## 导出功能
 如果要使用导出，则传入的数据必须为指针，类型可以是struct或者元素为struct的slice。  
 
-通过tag来确认需要导出的字段，内容为`export:”x:1,y:1”`，注意下x,y分别表是该字段在excel表格中的起始位置x为col，y为row，且tag中的x在数据中需要顺序列出。
+通过tag来确认需要导出的字段，内容为`export:”x:1,y:1”`，注意下x,y分别表是该字段在excel表格中的起始位置x为col，y为row，且tag中的x,y在数据中需要顺序列出,优先y，其次x。
+当导出的excel表格列数不确定时，tag使用`export:"loop:true"`，这样会将所有字段导出到excel表格中。
 
-详情请看测试文件
\ No newline at end of file
+详情请看测试文件
diff --git a/export/xlsx.go b/export/xlsx.go
index 134693e..bc72551 100644
--- a/export/xlsx.go
+++ b/export/xlsx.go
@@ -116,12 +116,20 @@ func (e *Exporter) writeCell(sheet string, field reflect.Value, tag string) {
 	y, _ := strconv.Atoi(tagMap["y"])
 	colSpan, _ := strconv.Atoi(tagMap["colspan"])
 	rowSpan, _ := strconv.Atoi(tagMap["rowspan"])
+	loop := tagMap["loop"]
 	var location Location
 	if e.preLocation != nil {
-		if x > e.preLocation.RightX {
-			y = e.preLocation.TopY
-		} else if x <= e.preLocation.RightX {
-			y = e.preLocation.BottomY + 1
+		if loop != "" {
+			y = e.preLocation.BottomY
+			if x <= e.preLocation.RightX {
+				x = e.preLocation.RightX + 1
+			}
+		} else {
+			if x > e.preLocation.RightX {
+				y = e.preLocation.TopY
+			} else if x <= e.preLocation.RightX {
+				y = e.preLocation.BottomY + 1
+			}
 		}
 	}
 	location = Location{
diff --git a/export5_test.go b/export5_test.go
new file mode 100644
index 0000000..a67f890
--- /dev/null
+++ b/export5_test.go
@@ -0,0 +1,126 @@
+package xlsx
+
+import (
+	"testing"
+	"time"
+
+	"git.botann.com/lijun/xlsx/export"
+)
+
+type CategoryReport struct {
+	ProjectID      int             `json:"project_id"`
+	ProjectName    string          `json:"project_name" export:"x:1,y:3"`
+	ProjectUnit    string          `json:"project_unit" export:"x:2,y:3"`
+	Developer      string          `json:"developer" export:"x:3,y:3"`
+	Location       string          `json:"location" export:"x:4,y:3"`
+	ProductionTime time.Time       `json:"production_time" export:"x:5,y:3"`
+	CompanyInvest  int64           `json:"company_invest" export:"x:6,y:3"`
+	Business       []BusinessIndex `json:"business"`
+}
+
+type BusinessIndex struct {
+	ProjectID int    `json:"project_id"`
+	IndexId   int    `json:"index_id"`
+	Year      int    `json:"year"`
+	Name      string `json:"name"`
+	Amount    int64  `json:"amount" export:"x:7,y:3,loop:true"`
+	Unit      string `json:"unit"`
+}
+
+type BusinessIndexTotal struct {
+	IndexId int    `json:"index_id"`
+	Name    string `json:"name"`
+	Amount  int64  `json:"amount" export:"x:7,y:2,loop:true"`
+}
+
+type CategoryStatistics struct {
+	Info Info             `json:"info"`
+	List []CategoryReport `json:"list"`
+}
+type Info struct {
+	Total []BusinessIndexTotal `json:"total"`
+	Title []BusinessIndex      `json:"title"`
+}
+
+func TestMain(t *testing.T) {
+	title := []export.Title{
+		{
+			Name:     "项目名称",
+			Location: export.Location{X: 1, Y: 1},
+		},
+		{
+			Name:     "项目单位",
+			Location: export.Location{X: 2, Y: 1},
+		},
+		{
+			Name:     "开发商",
+			Location: export.Location{X: 3, Y: 1},
+		},
+		{
+			Name:     "位置",
+			Location: export.Location{X: 4, Y: 1},
+		},
+		{
+			Name:     "生产时间",
+			Location: export.Location{X: 5, Y: 1},
+		},
+		{
+			Name:     "公司投资",
+			Location: export.Location{X: 6, Y: 1},
+		},
+		{
+			Name:     "生产规模",
+			Location: export.Location{X: 7, Y: 1},
+		},
+		{
+			Name:     "权益规模",
+			Location: export.Location{X: 8, Y: 1},
+		},
+		{
+			Name:     "总产量",
+			Location: export.Location{X: 9, Y: 1},
+		},
+		{
+			Name:     "合计",
+			Location: export.Location{X: 1, Y: 2},
+			Colspan:  6,
+		},
+	}
+	total := []BusinessIndexTotal{
+		{IndexId: 1, Name: "生产规模", Amount: 100}, {IndexId: 2, Name: "权益规模", Amount: 200}, {IndexId: 3, Name: "总产量", Amount: 300},
+	}
+	report := []CategoryReport{
+		CategoryReport{
+			ProjectID: 1, ProjectName: "项目1", ProjectUnit: "单位1", Developer: "开发商1", Location: "位置1", ProductionTime: time.Now(), CompanyInvest: 1000,
+			Business: []BusinessIndex{
+				{IndexId: 1, Name: "生产规模", Amount: 10, Unit: "吨"}, {IndexId: 2, Name: "权益规模", Amount: 20, Unit: "吨"}, {IndexId: 3, Name: "总产量", Amount: 30, Unit: "吨"},
+			},
+		},
+		CategoryReport{
+			ProjectID: 2, ProjectName: "项目2", ProjectUnit: "单位2", Developer: "开发商2", Location: "位置2", ProductionTime: time.Now(), CompanyInvest: 2000,
+			Business: []BusinessIndex{
+				{IndexId: 1, Name: "生产规模", Amount: 20, Unit: "吨"}, {IndexId: 2, Name: "权益规模", Amount: 40, Unit: "吨"}, {IndexId: 3, Name: "总产量", Amount: 60, Unit: "吨"},
+			},
+		},
+		CategoryReport{
+			ProjectID: 3, ProjectName: "项目3", ProjectUnit: "单位3", Developer: "开发商3", Location: "位置3", ProductionTime: time.Now(), CompanyInvest: 3000,
+			Business: []BusinessIndex{
+				{IndexId: 1, Name: "生产规模", Amount: 30, Unit: "吨"}, {IndexId: 2, Name: "权益规模", Amount: 60, Unit: "吨"}, {IndexId: 3, Name: "总产量", Amount: 90, Unit: "吨"},
+			},
+		},
+	}
+	info := Info{
+		Total: total,
+	}
+	data := CategoryStatistics{
+		List: report,
+		Info: info,
+	}
+	exporter := export.DefaultExporter()
+	exporter.Titles = title
+	exporter.Data = &data
+	exporter.File = "test5.xlsx"
+	exporter.Path = "./"
+	exporter.Export(0)
+
+}
diff --git a/test5.xlsx b/test5.xlsx
new file mode 100755
index 0000000..183c3f4
Binary files /dev/null and b/test5.xlsx differ