diff --git a/value_types.go b/value_types.go
new file mode 100644
index 0000000..5bcff02
--- /dev/null
+++ b/value_types.go
@@ -0,0 +1,53 @@
+package mapper
+
+import (
+	"reflect"
+	"strconv"
+	"strings"
+	"time"
+)
+
+func strFunc(str string) reflect.Value {
+	return reflect.ValueOf(str)
+}
+
+//Support computing
+func int64Func(str string) reflect.Value {
+	str = strings.TrimSpace(str)
+	if strings.Contains(str, "*") {
+		ss := strings.Split(str, "*")
+		var r int64
+		r = 1
+		for _, s := range ss {
+			r = r * int64Func(s).Int()
+		}
+		return reflect.ValueOf(r)
+	} else {
+		r, _ := strconv.ParseInt(str, 10, 64)
+		return reflect.ValueOf(r)
+	}
+}
+func uint64Func(str string) reflect.Value {
+	r, _ := strconv.ParseUint(str, 10, 64)
+	return reflect.ValueOf(r)
+}
+func boolFunc(str string) reflect.Value {
+	b, _ := strconv.ParseBool(str)
+	return reflect.ValueOf(b)
+}
+
+func float64Func(str string) reflect.Value {
+	r, _ := strconv.ParseFloat(str, 64)
+	return reflect.ValueOf(r)
+}
+
+func dateTimeFunc(str string) reflect.Value {
+	s := strings.Split(str, ";")
+	var t time.Time
+	if len(s) == 1 {
+		t, _ = time.ParseInLocation(defaultTimeLayout, str, time.Local)
+	} else if len(s) == 2 {
+		t, _ = time.ParseInLocation(s[1], s[0], time.Local)
+	}
+	return reflect.ValueOf(t)
+}
diff --git a/values_default.go b/values_default.go
new file mode 100644
index 0000000..f59ad0d
--- /dev/null
+++ b/values_default.go
@@ -0,0 +1,206 @@
+package mapper
+
+import (
+	"reflect"
+	"sync"
+	"time"
+)
+
+type DefaultInitValue interface {
+	Default() reflect.Value
+}
+
+var (
+	_defaultTag    = "default"
+	_notDefaultTag = "-"
+)
+var defaultTimeLayout = "2006-01-02 15:04:05"
+
+func SetDefaultTimeLayout(layout string) {
+	mux.Lock()
+	defer mux.Unlock()
+	defaultTimeLayout = layout
+}
+func SetDefaultTag(tag string) {
+	mux.Lock()
+	defer mux.Unlock()
+	_defaultTag = tag
+}
+
+type DefaultValueFunc func(str string) reflect.Value
+
+var regTypeFuncMap map[reflect.Type]DefaultValueFunc
+var regKindFuncMap map[reflect.Kind]DefaultValueFunc
+var mux sync.RWMutex
+
+func RegisterTypeForDefaultValue(t reflect.Type, f DefaultValueFunc) {
+	mux.Lock()
+	defer mux.Unlock()
+	regTypeFuncMap[t] = f
+}
+
+func RegisterKindForDefaultValue(t reflect.Kind, f DefaultValueFunc) {
+	mux.Lock()
+	defer mux.Unlock()
+	regKindFuncMap[t] = f
+}
+
+func init() {
+	regTypeFuncMap = make(map[reflect.Type]DefaultValueFunc)
+	regKindFuncMap = make(map[reflect.Kind]DefaultValueFunc)
+	RegisterTypeForDefaultValue(reflect.TypeOf(time.Time{}), dateTimeFunc)
+
+	RegisterKindForDefaultValue(reflect.Int64, int64Func)
+	RegisterKindForDefaultValue(reflect.Uint64, uint64Func)
+}
+func getFuncByKind(k reflect.Kind) DefaultValueFunc {
+	mux.RLock()
+	defer mux.RUnlock()
+	return regKindFuncMap[k]
+}
+func getFuncByType(k reflect.Type) DefaultValueFunc {
+	mux.RLock()
+	defer mux.RUnlock()
+	return regTypeFuncMap[k]
+}
+
+func getDefaultValueAndCheckEmbedded(v reflect.Value) (tv reflect.Value, ok bool) {
+	if !implDefaultInitValue(v.Type()) || (v.Type().Kind() == reflect.Ptr && v.Elem() == ZeroValue) {
+		return
+	}
+	t := v.Type()
+	structV := v
+	if t.Kind() == reflect.Ptr {
+		t = v.Elem().Type()
+		structV = v.Elem()
+	}
+	for i := 0; i < t.NumField(); i++ {
+		f := t.Field(i)
+		if f.Anonymous {
+			if implDefaultInitValue(f.Type) {
+				if structV.Field(i).Kind() == reflect.Ptr && structV.Field(i).IsNil() {
+					return
+				} else {
+					break
+				}
+			}
+		}
+	}
+	dv, _ := v.Interface().(DefaultInitValue)
+	tv = dv.Default()
+	ok = true
+	return
+}
+
+func bindValue(v reflect.Value, tag string) {
+	t := v.Type()
+	if t.Kind() == reflect.Ptr && v.Elem() != ZeroValue {
+		t = v.Elem().Type()
+	}
+	if tv, ok := getDefaultValueAndCheckEmbedded(v); ok {
+		//dv, _ := v.Interface().(DefaultInitValue)
+		////TODO 此处无法判断 指针类型带来的接口实现 会造成 default 执行报错,暂时利用深层以上方式 检测内嵌field是否实现了接口。
+		//tv := dv.Default()
+
+		if v.Type().Kind() == reflect.Ptr {
+			if tv.Type() == t {
+				v.Elem().Set(tv)
+				return
+			} else {
+				if filed, ok := v.Elem().Type().FieldByName(tv.Type().Name()); ok && canDefaultBind(filed, tag) {
+					v.Elem().FieldByName(tv.Type().Name()).Set(tv)
+				}
+			}
+		} else {
+			if tv.Type() == t {
+				v.Set(tv)
+				return
+			} else {
+			}
+		}
+
+	}
+	if t.Kind() == reflect.Struct {
+		for i := 0; i < t.NumField(); i++ {
+			if v.Type().Kind() == reflect.Ptr {
+				if canDefaultBind(v.Elem().Type().Field(i), tag) && !checkSampleValue(v.Elem().Field(i), v.Elem().Type().Field(i), tag) {
+					bindValue(v.Elem().Field(i), tag)
+				}
+			} else {
+				if canDefaultBind(v.Type().Field(i), tag) && !checkSampleValue(v.Field(i), v.Type().Field(i), tag) {
+					bindValue(v.Field(i), tag)
+				}
+			}
+		}
+	}
+}
+func canDefaultBind(field reflect.StructField, tag string) bool {
+	if t, ok := field.Tag.Lookup(tag); ok {
+		return t != _notDefaultTag
+	}
+	return true
+}
+func checkSampleValue(v reflect.Value, field reflect.StructField, tag string) (ok bool) {
+	if tagValue, ok := field.Tag.Lookup(tag); ok {
+		if tagValue == _notDefaultTag {
+			return true
+		} else {
+			if f := getFuncByType(v.Type()); f != nil {
+				if tv := f(tagValue); tv.Type() == v.Type() {
+					v.Set(tv)
+					ok = true
+				}
+			} else {
+				if f := getFuncByKind(v.Kind()); f != nil {
+					t := f(tagValue)
+					if v.Kind() == t.Kind() {
+						v.Set(t)
+						ok = true
+					}
+				} else {
+					switch v.Kind() {
+					case reflect.String:
+						v.SetString(strFunc(tagValue).String())
+						ok = true
+					case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+						v.SetInt(int64Func(tagValue).Int())
+						ok = true
+					case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+						v.SetUint(uint64Func(tagValue).Uint())
+						ok = true
+					case reflect.Bool:
+						v.SetBool(boolFunc(tagValue).Bool())
+						ok = true
+					case reflect.Float32, reflect.Float64:
+						v.SetFloat(float64Func(tagValue).Float())
+						ok = true
+					}
+				}
+			}
+		}
+	}
+	return
+}
+
+func implDefaultInitValue(t reflect.Type) bool {
+	if t.Kind() == reflect.Ptr {
+		return t.Elem().Implements(reflect.TypeOf((*DefaultInitValue)(nil)).Elem())
+	} else {
+		return t.Implements(reflect.TypeOf((*DefaultInitValue)(nil)).Elem())
+	}
+}
+
+func defaultTag(tags ...string) string {
+	if len(tags) > 0 {
+		return tags[0]
+	} else {
+		return _defaultTag
+	}
+}
+
+//default tagKey d
+func BindDefaultValue(target interface{}, tags ...string) {
+	if reflect.TypeOf(target).Kind() == reflect.Ptr {
+		bindValue(reflect.ValueOf(target), defaultTag(tags...))
+	}
+}
diff --git a/values_default_test.go b/values_default_test.go
new file mode 100644
index 0000000..376509a
--- /dev/null
+++ b/values_default_test.go
@@ -0,0 +1,82 @@
+package mapper
+
+import (
+	"encoding/json"
+	"log"
+	"reflect"
+	"testing"
+	"time"
+)
+
+func init() {
+	SetDefaultTag("default")
+	log.SetFlags(log.Lshortfile | log.LstdFlags)
+}
+
+//func (s InfoForDefaultValueFunc) Default() reflect.Value {
+//	return reflect.ValueOf(InfoForDefaultValueFunc{Name: "test name"})
+//}
+
+type InfoForDefaultValueFunc struct {
+	Ext  string `default:"aaa"`
+	Name string `default:"123"`
+	AA   string `default:"aaaaaa"`
+	Int  int    `default:"12*11"`
+}
+type Info struct {
+	Name       string  `default:"123"`
+	Ext        string  `default:"aaa"`
+	BoolFalse  bool    `default:"false"`
+	BoolTrue   bool    `default:"true"`
+	Float      float32 `default:"12.21"`
+	Float64    float64 `default:"12.51"`
+	Int        int     `default:"12*11"`
+	Int64      int64   `default:"12*11"`
+	NumberUint uint    `default:"12"`
+}
+
+func (s AnyInfo) Default() reflect.Value {
+	return reflect.ValueOf(AnyInfo{AnyInfoName: "test anyInfo name~~~~"})
+}
+
+type AnyInfo struct {
+	AnyInfoName string `default:"dddddanyInfo"`
+}
+type ReStr string
+type ReInt int
+type ReInfo Info
+type ReBool bool
+type ShowInfo struct {
+	Info
+	*AnyInfo
+	ReInfo                  ReInfo
+	AnyInfo2                AnyInfo
+	ReInt                   ReInt  `default:"10"`
+	ReStr                   ReStr  `default:"reStr"`
+	ReBool                  ReBool `default:"true"`
+	InfoForDefaultValueFunc InfoForDefaultValueFunc
+	CreateTime              time.Time `default:"2020-01-02 03:04:01"`
+}
+
+func TestBindDefaultValue(t *testing.T) {
+	t0 := time.Now()
+	var s ShowInfo
+	BindDefaultValue(&s)
+	data, _ := json.Marshal(s)
+	log.Printf("%+v", s)
+	log.Printf("%s %v", data, time.Now().Sub(t0))
+}
+
+func BenchmarkBindDefaultValue(b *testing.B) {
+	var s InfoForDefaultValueFunc
+	for i := 0; i < b.N; i++ {
+		BindDefaultValue(&s)
+	}
+}
+func BenchmarkBindDefaultValue2(b *testing.B) {
+	data := []byte(`{"Name":"123","Ext":"aaa","BoolFalse":false,"BoolTrue":true,"Float":12.21,"Float64":12.51,"Int":132,"Int64":132,"NumberUint":12,"AnyInfo2":{"AnyInfoName":"test anyInfo name~~~~"},"InfoForDefaultValueFunc":{"Ext":"aaa","Name":"123"},"CreateTime":"2020-01-02T03:04:01+08:00"}`)
+	for i := 0; i < b.N; i++ {
+		var s ShowInfo
+		_ = json.Unmarshal(data, &s)
+	}
+}