diff --git a/log.go b/log.go
index 4438edc..8a05c39 100644
--- a/log.go
+++ b/log.go
@@ -86,10 +86,12 @@ type Logger struct {
 	debug_tmpl *template.Template
 	warn_tmpl  *template.Template
 	info_tmpl  *template.Template
+	subs       []*Logger
 }
 
-func Default() *Logger {
+func New(name string) *Logger {
 	l := &Logger{
+		system:    name,
 		err:       os.Stderr,
 		out:       os.Stdout,
 		color:     true,
@@ -112,6 +114,10 @@ func (l *Logger) Sub(sys string) *Logger {
 		warn_tmpl:  l.warn_tmpl,
 		info_tmpl:  l.info_tmpl,
 	}
+	if l.subs == nil {
+		l.subs = make([]*Logger, 0)
+	}
+	l.subs = append(l.subs, ret)
 	return ret
 }
 
@@ -134,15 +140,36 @@ func (l *Logger) SetErrOutput(err io.Writer) {
 	l.err = err
 }
 
+func (l *Logger) SetErrOutputAll(err io.Writer) {
+	for _, v := range getAllOffsprings(l) {
+		v.err = err
+	}
+}
+
 func (l *Logger) SetOutput(out io.Writer) {
 	l.out = out
 }
 
+func (l *Logger) SetOutputAll(out io.Writer) {
+	for _, v := range getAllOffsprings(l) {
+		v.out = out
+	}
+}
+
 func (l *Logger) Reload() error {
 	l.guessColor()
 	return l.ParseTmpl()
 }
 
+func (l *Logger) ReloadAll() error {
+	for _, v := range getAllOffsprings(l) {
+		if err := v.Reload(); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 func NewLogFormater() *LogFormater {
 	return &LogFormater{
 		ErrTmplStr:   DEFAULT_ERR,
@@ -156,7 +183,6 @@ func (l *Logger) DefaultFuncMap() template.FuncMap {
 	funcMap := template.FuncMap{
 		"Time": func() string { return time.Now().Format("2006/01/02 15:04:05") },
 	}
-	setColorMap(funcMap, l.color)
 	return funcMap
 }
 
@@ -164,22 +190,25 @@ func (l *Logger) ParseTmpl() error {
 	if l.funcMap == nil {
 		l.funcMap = l.DefaultFuncMap()
 	}
-	err_tmpl, err := template.New("err_tmpl").Funcs(l.funcMap).Parse(l.formatter.ErrTmplStr)
+	funcMap := copyFuncMap(l.funcMap)
+	setColorMap(funcMap, l.color)
+
+	err_tmpl, err := template.New("err_tmpl").Funcs(funcMap).Parse(l.formatter.ErrTmplStr)
 	if err != nil {
 		return err
 	}
 	l.err_tmpl = err_tmpl
-	warn_tmpl, err := template.New("warn_tmpl").Funcs(l.funcMap).Parse(l.formatter.WarnTmplStr)
+	warn_tmpl, err := template.New("warn_tmpl").Funcs(funcMap).Parse(l.formatter.WarnTmplStr)
 	if err != nil {
 		return err
 	}
 	l.warn_tmpl = warn_tmpl
-	info_tmpl, err := template.New("info_tmpl").Funcs(l.funcMap).Parse(l.formatter.InfoTmplStr)
+	info_tmpl, err := template.New("info_tmpl").Funcs(funcMap).Parse(l.formatter.InfoTmplStr)
 	if err != nil {
 		return err
 	}
 	l.info_tmpl = info_tmpl
-	debug_tmpl, err := template.New("debug_tmpl").Funcs(l.funcMap).Parse(l.formatter.DebugTmplStr)
+	debug_tmpl, err := template.New("debug_tmpl").Funcs(funcMap).Parse(l.formatter.DebugTmplStr)
 	if err != nil {
 		return err
 	}
diff --git a/log_test.go b/log_test.go
index b630231..03c12a6 100644
--- a/log_test.go
+++ b/log_test.go
@@ -1,11 +1,13 @@
 package log
 
 import (
+	"io"
 	"os"
 	"testing"
 )
 
 func TestDev(t *testing.T) {
+	LEVEL = Lerror | Ldebug | Lwarn | Linfo
 	PROD = false
 	// log.system = "dev"
 	Error("d", "sdf", "sdfsdf")
@@ -97,3 +99,24 @@ func TestToFile(t *testing.T) {
 	l.Info("d", "sdf", "sdfsdf")
 	l.InfoF(H{"Test": "set"}, "d", "sdf", "sdfsdf")
 }
+
+func TestApplyChild(t *testing.T) {
+	PROD = true
+	l := Sub("parent")
+	l1 := l.Sub("child1")
+	l2 := l.Sub("child2")
+	l3 := l.Sub("child3")
+	l1.Info("child1")
+	l2.Info("child2")
+	l3.Info("child3")
+	l.SetOutputAll(io.Discard)
+	l.ReloadAll()
+	l1.Info("child1-discard")
+	l2.Info("child2-discard")
+	l3.Info("child3-discard")
+	SetOutputAll(os.Stdout)
+	ReloadAll()
+	l1.Info("child1-stdout")
+	l2.Info("child2-stdout")
+	l3.Info("child3-stdout")
+}
diff --git a/std.go b/std.go
index 9631b95..15568a1 100644
--- a/std.go
+++ b/std.go
@@ -1,11 +1,41 @@
 package log
 
-var std = Default()
+import "io"
+
+var std = New("")
 
 func Sub(sys string) *Logger {
 	return std.Sub(sys)
 }
 
+func SetColor(c bool) {
+	std.SetColor(c)
+}
+
+func SetErrOutput(err io.Writer) {
+	std.SetErrOutput(err)
+}
+
+func SetErrOutputAll(err io.Writer) {
+	std.SetErrOutputAll(err)
+}
+
+func SetOutput(out io.Writer) {
+	std.SetOutput(out)
+}
+
+func SetOutputAll(out io.Writer) {
+	std.SetOutputAll(out)
+}
+
+func Reload() error {
+	return std.Reload()
+}
+
+func ReloadAll() error {
+	return std.ReloadAll()
+}
+
 func ErrorF(fields H, v ...interface{}) {
 	if PROD {
 		std.output(terror, 3, "", fields, v...)
diff --git a/util.go b/util.go
index 563c4ef..923d8ff 100644
--- a/util.go
+++ b/util.go
@@ -3,6 +3,7 @@ package log
 import (
 	"fmt"
 	"runtime"
+	"text/template"
 )
 
 func caller(depth int) string {
@@ -27,3 +28,22 @@ func stack() string {
 		buf = make([]byte, 2*len(buf))
 	}
 }
+
+func getAllOffsprings(l *Logger) []*Logger {
+	if l.subs == nil || len(l.subs) == 0 {
+		return []*Logger{l}
+	}
+	loggers := []*Logger{}
+	for i := range l.subs {
+		loggers = append(loggers, getAllOffsprings(l.subs[i])...)
+	}
+	return loggers
+}
+
+func copyFuncMap(source template.FuncMap) template.FuncMap {
+	dest := template.FuncMap{}
+	for k, v := range source {
+		dest[k] = v
+	}
+	return dest
+}