diff --git a/res/doc/usage.txt b/res/doc/usage.txt
index 1e57d16d939f6824507de91869d6e00643ccc388..f71e521311f984931d146a3818878adc19fe7306 100644
--- a/res/doc/usage.txt
+++ b/res/doc/usage.txt
@@ -10,14 +10,12 @@ zendata是一款通用的数据生成工具，您可以使用yaml文件来定义
   -F  --field      可通过该参数指定要输出的字段列表，用逗号分隔。 默认是所有的字段。
   -t  --table      输出格式为sql时，需通过该参数指定要插入数据的表名。
   -H  --human      输出可读格式，打印字段名，并使用tab键进行分割。
-
-  -W  --width      生成的字符串宽度，默认侧补空格。
-  -P  --leftPad    宽度不足时，左侧补充的字符，默认为空格。此参数为非空时，RightPad设置无效。
-  -R  --rightPad   宽度不足时，右侧补充的字符，仅在LeftPad为空时有效。
+  -r  --recursive  递归模式。如不指定，默认为平行模式。平行模式下各个字段独立循环。
+                   递归模式下每个字段的取值依赖于前一字段。可增强数据的随机性。
 
   -p  --port       在指定端口上运行HTTP服务。可通过http://ip/接口获得JSON格式的数据。服务模式下只支持数据生成。
   -b  --bind       监听的ip地址，默认监听所有的ip地址。
-  -r  --root       运行HTTP服务时根目录。客户端可调用该根目录下面的配置文件。如果不指定，取zd可执行文件所在目录。
+  -R  --root       运行HTTP服务时根目录。客户端可调用该根目录下面的配置文件。如果不指定，取zd可执行文件所在目录。
 
   -i  --input      指定一个schema文件，输出每个表的yaml配置文件。需通过-o参数指定一个输出的目录。
   -s  --server     数据库服务器类型，支持mysql|oracle|sqlite|sqlserver，默认为mysql。可用于解析yaml文件或者生成SQL。
diff --git a/res/doc/usage_en.txt b/res/doc/usage_en.txt
index b1ee99e023ad43ff9a6c0da5265c48b90ff32a83..93f3752de01f42693ae551fa16b837a271ac626a 100644
--- a/res/doc/usage_en.txt
+++ b/res/doc/usage_en.txt
@@ -14,10 +14,13 @@ Parameters
   -t  --table      If the output format is sql, using it to specify the table name to insert data to.
   -H  --human      Output a readable format, print the field name, and use the tab key to split.
 
+  -r  --recursive  Recursive mode. The default mode is parallel, in which each field loops independently.
+                   The value of a field in the recursive mode depends on that of the previous field, which enables the random data.
+
   -p  --port       Run the HTTP on the specified port. The data in JSON format can be obtained via http://ip/ port. 
                    Only data generation is supported.
   -b  --bind       Listen IP addresses. All IP addresses are listened by default.
-  -r  --root       The root directory when running HTTP. The client can call the config file under the root directory. 
+  -R  --root       The root directory when running HTTP. The client can call the config file under the root directory.
                    If not specified, take the directory where the zd executable file is located.
 
   -i  --input      Specify a sql schema file and output the YAML config file for each table. 
diff --git a/src/action/generator.go b/src/action/generator.go
index de6ec3c1ef67943cd1b10ba41c06256bd203c667..5b45e4d3a711bf3a107927b0dca97a67b9d26f5b 100644
--- a/src/action/generator.go
+++ b/src/action/generator.go
@@ -8,7 +8,6 @@ import (
 	"github.com/easysoft/zendata/src/model"
 	constant "github.com/easysoft/zendata/src/utils/const"
 	logUtils "github.com/easysoft/zendata/src/utils/log"
-	stringUtils "github.com/easysoft/zendata/src/utils/string"
 	"github.com/easysoft/zendata/src/utils/vari"
 	"strings"
 )
@@ -74,7 +73,7 @@ func Print(rows [][]string, format string, table string, colTypes []bool, fields
 			row.Cols = append(row.Cols, col)
 
 			colVal := col
-			colVal = stringUtils.AddPad(colVal)
+			//colVal = stringUtils.AddPad(colVal, vari.Def.Fields[j])
 			if !colTypes[j] { colVal = "'" + colVal + "'" }
 			valueList = valueList + colVal
 		}
diff --git a/src/gen/analyse.go b/src/gen/analyse.go
index bb2cf5be6bc27f08a9d74d1502fcc973153e5d12..c8c73f930f5a0d9fff155cf5e403f24f94d111ea 100644
--- a/src/gen/analyse.go
+++ b/src/gen/analyse.go
@@ -49,8 +49,8 @@ func LinesToMap(str string, fieldsToExport []string) (ret []map[string]string) {
 		for j, field := range vari.Def.Fields {
 			col := "" // TODO: use post/pre fix to seperate
 
-			col = left[:field.Length]
-			left = left[field.Length:]
+			col = left[:field.Width]
+			left = left[field.Width:]
 
 			rowMap[fieldsToExport[j]] = col
 		}
diff --git a/src/gen/definition.go b/src/gen/definition.go
index fce6272d6353897fd57e28031656a6d299ea24c1..0ea1bc6a5b31af482c27d40d7ba72f66db04f6a3 100644
--- a/src/gen/definition.go
+++ b/src/gen/definition.go
@@ -164,8 +164,8 @@ func CopyField(child model.DefField, parent *model.DefField) {
 	if child.Precision != 0 {
 		(*parent).Precision = child.Precision
 	}
-	if child.Length != 0 {
-		(*parent).Length = child.Length
+	if child.Width != 0 {
+		(*parent).Width = child.Width
 	}
 }
 
diff --git a/src/gen/generator.go b/src/gen/generator.go
index 13987315f3209a8c580f4f14947fb4038f4cdc79..9cddcff369b167ef0e7cc7fd2e65a86eb9ebfa75 100644
--- a/src/gen/generator.go
+++ b/src/gen/generator.go
@@ -228,8 +228,8 @@ func GenerateFieldValWithFix(field model.DefField, fieldValue model.FieldValue,
 		loopStr = prefix + loopStr + postfix
 	}
 
-	if field.Length > runewidth.StringWidth(loopStr) {
-		loopStr = loopStr + strings.Repeat(" ", field.Length - runewidth.StringWidth(loopStr))
+	if field.Width > runewidth.StringWidth(loopStr) {
+		loopStr = stringUtils.AddPad(loopStr, field)
 	}
 
 	return loopStr
diff --git a/src/model/definition.go b/src/model/definition.go
index 1a79f862485f6eec88971af3372cd906c0692c7c..948e2fd2d511ab0f203f745ac5c73d451e48f8bf 100644
--- a/src/model/definition.go
+++ b/src/model/definition.go
@@ -34,7 +34,9 @@ type DefData struct {
 type DefField struct {
 	FieldBase   `yaml:",inline"`
 	Fields   []DefField `yaml:"fields,flow"`
-	Length int `yaml:"length"`
+	Width int `yaml:"width"`
+	LeftPad string `yaml:"leftPad"`
+	RightPad string `yaml:"rightPad"`
 	Path string
 }
 
diff --git a/src/service/md5.go b/src/service/md5.go
index 449565412e46d37a3c1cd17b7272f41ec1ff3039..56a9008da7325d366ed9b53803d3246cdede7bab 100644
--- a/src/service/md5.go
+++ b/src/service/md5.go
@@ -14,7 +14,7 @@ const (
 	md5Col = "CW"
 )
 
-func AddMd5(path string, salt string) {
+func AddMd5(path string) {
 	excel, err := excelize.OpenFile(path)
 	if err != nil {
 		logUtils.Screen(i118Utils.I118Prt.Sprintf("fail_to_read_file", path))
@@ -46,7 +46,7 @@ func AddMd5(path string, salt string) {
 				val := strings.TrimSpace(col)
 				str = str + val
 			}
-			md5Str := md5V(str, salt)
+			md5Str := md5V(str)
 			excel.SetCellValue(sheet, md5Col + strconv.Itoa(index + 1), md5Str)
 		}
 	}
@@ -56,9 +56,8 @@ func AddMd5(path string, salt string) {
 	}
 }
 
-func md5V(str, salt string) string  {
+func md5V(str string) string  {
 	h := md5.New()
 	h.Write([]byte(str))
-	h.Write([]byte(salt))
 	return hex.EncodeToString(h.Sum(nil))
 }
\ No newline at end of file
diff --git a/src/service/request.go b/src/service/request.go
index 53746634b222c32189875bb5e19926000afec5cc..730084dee653e32b357ddde38a3635ecbc301cf3 100644
--- a/src/service/request.go
+++ b/src/service/request.go
@@ -10,7 +10,7 @@ import (
 )
 
 func ParseRequestParams(req *http.Request) (root, defaultFile, yamlFile string, count int,
-		fields, human string, width int, leftPad, rightPad, format, table string) {
+		fields, human string, format, table string) {
 	query := req.URL.Query()
 
 	root = GetRequestParams(query,"root", "r")
@@ -24,10 +24,6 @@ func ParseRequestParams(req *http.Request) (root, defaultFile, yamlFile string,
 	table = ""
 
 	human = GetRequestParams(query,"human", "H")
-	widthStr := GetRequestParams(query,"width", "W")
-	width, _ = strconv.Atoi(widthStr)
-	leftPad = GetRequestParams(query,"leftPad", "L")
-	rightPad = GetRequestParams(query,"rightPad", "R")
 
 	req.ParseForm()
 	defaultDefContent := req.FormValue("default")
diff --git a/src/utils/string/string.go b/src/utils/string/string.go
index 249068e8a8ba505e2cfa0600d0387f3c91aa864a..253833e227459c26be9241a43f38b3ff10c085fe 100644
--- a/src/utils/string/string.go
+++ b/src/utils/string/string.go
@@ -5,8 +5,8 @@ import (
 	"encoding/binary"
 	"encoding/hex"
 	"fmt"
+	"github.com/easysoft/zendata/src/model"
 	constant "github.com/easysoft/zendata/src/utils/const"
-	"github.com/easysoft/zendata/src/utils/vari"
 	"github.com/mattn/go-runewidth"
 	"strconv"
 	"strings"
@@ -109,20 +109,20 @@ func InArray(need interface{}, arr []string) bool {
 	return false
 }
 
-func AddPad(str string) string {
-	if vari.Length > 0 {
-		gap := vari.Length - len(str)
-		if vari.LeftPad != "" {
-			vari.LeftPad = vari.LeftPad[:1]
-			pads := strings.Repeat(vari.LeftPad, gap)
+func AddPad(str string, field model.DefField) string {
+	if  field.Width > 0 && field.Width > runewidth.StringWidth(str) {
+		gap := field.Width - len(str)
+		if field.LeftPad != "" {
+			field.LeftPad = field.LeftPad[:1]
+			pads := strings.Repeat(field.LeftPad, gap)
 			str = pads + str
-		} else if vari.RightPad != "" {
-			vari.RightPad = vari.RightPad[:1]
-			pads := strings.Repeat(vari.RightPad, gap)
+		} else if field.RightPad != "" {
+			field.RightPad = field.RightPad[:1]
+			pads := strings.Repeat(field.RightPad, gap)
 			str = str + pads
 		} else {
-			vari.LeftPad = " "
-			pads := strings.Repeat(vari.LeftPad, gap)
+			field.LeftPad = " "
+			pads := strings.Repeat(field.LeftPad, gap)
 			str = pads + str
 		}
 	}
diff --git a/src/utils/vari/var.go b/src/utils/vari/var.go
index 61c76e6550622f648b8dc1646477d03eead5d5da..b606d5bfd8becc44e4cfd044b665756f5fd77d80 100644
--- a/src/utils/vari/var.go
+++ b/src/utils/vari/var.go
@@ -23,10 +23,6 @@ var (
 	WithHead bool
 	HeadSep string
 
-	Length int
-	LeftPad string
-	RightPad string
-
 	JsonResp string = "[]"
 	Ip string
 	Port int
diff --git a/src/zd.go b/src/zd.go
index 4087cf26a4e944b203138a0668b7c2e328018007..7525f4d8c2389f1e724222ad24d4d98fb2a22ead 100644
--- a/src/zd.go
+++ b/src/zd.go
@@ -41,7 +41,6 @@ var (
 	viewRes string
 	viewDetail string
 	md5 string
-	salt string
 
 	example bool
 	help   bool
@@ -88,7 +87,6 @@ func main() {
 	flagSet.StringVar(&viewRes, "view", "", "")
 
 	flagSet.StringVar(&md5, "md5", "", "")
-	flagSet.StringVar(&salt, "salt", "", "")
 
 	flagSet.StringVar(&vari.HeadSep, "H", "", "")
 	flagSet.StringVar(&vari.HeadSep, "human", "", "")
@@ -96,18 +94,11 @@ func main() {
 	flagSet.StringVar(&analyse, "a", "", "")
 	flagSet.StringVar(&analyse, "analyse", "", "")
 
-	flagSet.IntVar(&vari.Length, "W", 0, "")
-	flagSet.IntVar(&vari.Length, "width", 0, "")
-	flagSet.StringVar(&vari.LeftPad, "L", "", "")
-	flagSet.StringVar(&vari.LeftPad, "leftPad", "", "")
-	flagSet.StringVar(&vari.RightPad, "R", "", "")
-	flagSet.StringVar(&vari.RightPad, "rightPad", "", "")
-
 	flagSet.StringVar(&vari.Ip, "b", "", "")
 	flagSet.StringVar(&vari.Ip, "bind", "", "")
 	flagSet.IntVar(&vari.Port, "p", 0, "")
 	flagSet.IntVar(&vari.Port, "port", 0, "")
-	flagSet.StringVar(&root, "r", "", "")
+	flagSet.StringVar(&root, "R", "", "")
 	flagSet.StringVar(&root, "root", "", "")
 
 	flagSet.BoolVar(&example, "e", false, "")
@@ -137,7 +128,7 @@ func main() {
 				service.ViewRes(viewRes)
 				return
 			} else if md5 != "" {
-				service.AddMd5(md5, salt)
+				service.AddMd5(md5)
 				return
 			} else if analyse != "" {
 				gen.Analyse(output, fields, analyse, defaultFile)
@@ -203,8 +194,7 @@ func StartServer() {
 }
 
 func DataHandler(w http.ResponseWriter, req *http.Request) {
-	root, defaultFile, configFile, count, fields,
-		vari.HeadSep, vari.Length, vari.LeftPad, vari.RightPad,
+	root, defaultFile, configFile, count, fields, vari.HeadSep,
 		format, table = service.ParseRequestParams(req)
 
 	vari.RunMode = constant.RunModeServerRequest