diff --git a/demo/advanced.yaml b/demo/advanced.yaml
index 65ffc05e73499eaf1989332d4132a2665af3bbed..a1754922087641abc4c9b770c585b10f7ad93d63 100644
--- a/demo/advanced.yaml
+++ b/demo/advanced.yaml
@@ -6,10 +6,8 @@ version: 1.0
 
 fields:
 
-  - field: field_step_negative         # 区间指定步长。
-    range: z-a:-2                      # 9,7,5,4...
-    loop: 1-3
-    loopfix: "|"
+  - field: field_step_negative         # 区间指定负数步长。
+    range: 9-1:-2                      # 9,7,5,4...
     prefix: "["
     postfix: "]\t"
 
@@ -25,6 +23,11 @@ fields:
     prefix: "["
     postfix: "]\t"
 
+  - field: field_value                 # 引用同文件其他字段进行数学运算。
+    value: "$field_step_negative * 2 - 1"
+    prefix: "["
+    postfix: "]\t"
+
   - field: field_nested_range
     from: zentao.number.v1.yaml       # 引用用户自定义ranges，存于users目录下。
     use: medium
diff --git a/src/action/generator.go b/src/action/generator.go
index ce08eadcbfcde436384844d4b5cf59dccf8d1c57..d0dac31d37348eb0b75fea594ff67feda079ff8f 100644
--- a/src/action/generator.go
+++ b/src/action/generator.go
@@ -28,7 +28,7 @@ func Generate(defaultFile string, configFile string, fieldsToExportStr, format,
 		return
 	}
 
-	if format == constant.FormatExcel {
+	if format == constant.FormatExcel || format == constant.FormatCsv {
 		gen.Write(rows, format, table, colIsNumArr, fieldsToExport)
 	} else {
 		gen.Print(rows, format, table, colIsNumArr, fieldsToExport)
diff --git a/src/gen/output.go b/src/gen/printer.go
similarity index 99%
rename from src/gen/output.go
rename to src/gen/printer.go
index 2bd0b6b0c924dd289650d6bfff1de75107dcc403..26fc6c9bb69621757de0a11f3929802679be888c 100644
--- a/src/gen/output.go
+++ b/src/gen/printer.go
@@ -37,7 +37,7 @@ func Print(rows [][]string, format string, table string, colIsNumArr []bool,
 				col = stringUtils.AddPad(col, field)
 			}
 
-			if j > 0 && vari.Human {
+			if j > 0 && vari.Human { // use a tab
 				lineForText = strings.TrimRight(lineForText, "\t")
 				col = strings.TrimLeft(col, "\t")
 
diff --git a/src/gen/write.go b/src/gen/writer.go
similarity index 58%
rename from src/gen/write.go
rename to src/gen/writer.go
index f434ab254e7043be5aaad355f7f8ceeeaa887a67..51327699a2322cb8de54588f29eb85a0ed54b875 100644
--- a/src/gen/write.go
+++ b/src/gen/writer.go
@@ -1,7 +1,7 @@
 package gen
 
 import (
-	"fmt"
+	"encoding/csv"
 	"github.com/360EntSecGroup-Skylar/excelize/v2"
 	constant "github.com/easysoft/zendata/src/utils/const"
 	logUtils "github.com/easysoft/zendata/src/utils/log"
@@ -13,6 +13,9 @@ import (
 const (
 	sheetName = "Sheet1"
 )
+var (
+	csvWriter *csv.Writer
+)
 
 func Write(rows [][]string, format string, table string, colIsNumArr []bool,
 		fields []string) (lines []interface{}) {
@@ -23,23 +26,41 @@ func Write(rows [][]string, format string, table string, colIsNumArr []bool,
 
 	if format == constant.FormatExcel {
 		printExcelHeader(fields, f)
+	} else if format == constant.FormatCsv {
+		csvWriter = csv.NewWriter(logUtils.FileWriter)
 	}
 
-	for i, row := range rows {
-		for j, col := range row {
+	csvData := make([][]string, 0)
+	for i, cols := range rows {
+		csvRow := make([]string, 0)
+
+		for j, col := range cols {
 			col = replacePlaceholder(col)
 			field := vari.TopFieldMap[fields[j]]
 			if field.Length > runewidth.StringWidth(col) {
 				col = stringUtils.AddPad(col, field)
 			}
 
-			colName, _ := excelize.CoordinatesToCellName(j + 1, i + 2)
-			f.SetCellValue(sheetName, colName, col)
+			if format == constant.FormatExcel {
+				colName, _ := excelize.CoordinatesToCellName(j + 1, i + 2)
+				f.SetCellValue(sheetName, colName, col)
+
+			} else if format == constant.FormatCsv {
+				csvRow = append(csvRow, col)
+			}
 		}
+		csvData = append(csvData, csvRow)
 	}
 
-	if err := f.SaveAs(logUtils.FilePath); err != nil {
-		fmt.Println(err)
+	var err error
+	if format == constant.FormatExcel {
+		err = f.SaveAs(logUtils.FilePath)
+	} else if format == constant.FormatCsv {
+		err = csvWriter.WriteAll(csvData)
+		csvWriter.Flush()
+	}
+	if err != nil {
+		logUtils.PrintErrMsg(err.Error())
 	}
 
 	return
diff --git a/src/model/definition.go b/src/model/definition.go
index b5344ddde0b90e9613c4d8f9d83b9c20f383e724..cbcfdfcfdea3299338eea52867201354eb2e7d2d 100644
--- a/src/model/definition.go
+++ b/src/model/definition.go
@@ -72,6 +72,7 @@ type FieldSimple struct {
 	Field  string  `yaml:"field"`
 	Note     string  `yaml:"note"`
 	Range    string  `yaml:"range"`
+	Value string  `yaml:"value"`
 	Prefix   string  `yaml:"prefix"`
 	Postfix  string  `yaml:"postfix"`
 	Loop  string  `yaml:"loop"`