diff --git a/log/handler.go b/log/handler.go
new file mode 100644
index 0000000..2a05098
--- /dev/null
+++ b/log/handler.go
@@ -0,0 +1,208 @@
+package log
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"time"
+)
+
+type Handler interface {
+	Write(p []byte) (n int, err error)
+	Close()
+}
+
+type base struct {
+	msg  chan []byte
+	quit chan bool
+}
+
+func (h *base) Write(p []byte) (n int, err error) {
+	m := make([]byte, len(p))
+
+	copy(m, p)
+
+	h.msg <- m
+
+	return len(p), nil
+}
+
+func (h *base) Close() {
+	h.quit <- true
+}
+
+type StreamHandler struct {
+	base
+	w io.Writer
+}
+
+func NewStreamHandler(w io.Writer, msgNum int) (*StreamHandler, error) {
+	h := new(StreamHandler)
+
+	h.w = w
+
+	h.msg = make(chan []byte, msgNum)
+	h.quit = make(chan bool, 1)
+
+	go h.run()
+
+	return h, nil
+}
+
+func NewDefaultStreamHandler(w io.Writer) (*StreamHandler, error) {
+	return NewStreamHandler(w, 1024)
+}
+
+func (h *StreamHandler) run() {
+	for {
+		select {
+		case m := <-h.msg:
+			h.w.Write(m)
+		case <-h.quit:
+			return
+		}
+	}
+}
+
+type FileHandler struct {
+	base
+	fd *os.File
+}
+
+func NewFileHandler(fileName string, flag int, msgNum int) (*FileHandler, error) {
+	f, err := os.OpenFile(fileName, flag, 0)
+	if err != nil {
+		return nil, err
+	}
+
+	h := new(FileHandler)
+
+	h.fd = f
+
+	h.msg = make(chan []byte, msgNum)
+	h.quit = make(chan bool, 1)
+
+	go h.run()
+
+	return h, nil
+}
+
+func NewDefaultFileHandler(fileName string, flag int) (*FileHandler, error) {
+	return NewFileHandler(fileName, flag, 1024)
+}
+
+func (h *FileHandler) run() {
+	for {
+		select {
+		case m := <-h.msg:
+			h.fd.Write(m)
+		case <-h.quit:
+			h.fd.Close()
+			return
+		}
+	}
+}
+
+//refer: http://docs.python.org/2/library/logging.handlers.html
+//same like python TimedRotatingFileHandler
+
+type TimeRotatingFileHandler struct {
+	base
+
+	fd *os.File
+
+	baseName   string
+	interval   int64
+	suffix     string
+	rolloverAt int64
+}
+
+const (
+	WhenSecond = iota
+	WhenMinute
+	WhenHour
+	WhenDay
+)
+
+func NewTimeRotatingFileHandler(baseName string, when int8, interval int, msgNum int) (*TimeRotatingFileHandler, error) {
+	h := new(TimeRotatingFileHandler)
+
+	h.baseName = baseName
+
+	switch when {
+	case WhenSecond:
+		h.interval = 1
+		h.suffix = "2006-01-02_15-04-05"
+	case WhenMinute:
+		h.interval = 60
+		h.suffix = "2006-01-02_15-04"
+	case WhenHour:
+		h.interval = 3600
+		h.suffix = "2006-01-02_15"
+	case WhenDay:
+		h.interval = 3600 * 24
+		h.suffix = "2006-01-02"
+	default:
+		e := fmt.Errorf("invalid when_rotate: %d", when)
+		panic(e)
+	}
+
+	h.interval = h.interval * int64(interval)
+
+	var err error
+	h.fd, err = os.OpenFile(h.baseName, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
+	if err != nil {
+		panic(err)
+	}
+
+	fInfo, _ := h.fd.Stat()
+	h.rolloverAt = fInfo.ModTime().Unix() + h.interval
+	h.msg = make(chan []byte, msgNum)
+	h.quit = make(chan bool, 1)
+
+	go h.run()
+
+	return h, nil
+}
+
+func NewDefaultTimeRotatingFileHandler(baseName string, when int8, interval int) (*TimeRotatingFileHandler, error) {
+	return NewTimeRotatingFileHandler(baseName, when, interval, 1024)
+}
+
+func (h *TimeRotatingFileHandler) doRollover() {
+	//refer http://hg.python.org/cpython/file/2.7/Lib/logging/handlers.py
+	now := time.Now()
+
+	if h.rolloverAt <= now.Unix() {
+		fName := h.baseName + now.Format(h.suffix)
+		h.fd.Close()
+		e := os.Rename(h.baseName, fName)
+		if e != nil {
+			panic(e)
+		}
+
+		h.fd, _ = os.OpenFile(h.baseName, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
+
+		h.rolloverAt = time.Now().Unix() + h.interval
+	}
+}
+
+func (h *TimeRotatingFileHandler) run() {
+	for {
+		select {
+		case m := <-h.msg:
+			h.doRollover()
+			if h.fd != nil {
+				_, e := h.fd.Write(m)
+				if e != nil {
+					panic(e)
+				}
+			}
+		case <-h.quit:
+			if h.fd != nil {
+				h.fd.Close()
+			}
+			return
+		}
+	}
+}
diff --git a/log/log.go b/log/log.go
new file mode 100644
index 0000000..45f9cc9
--- /dev/null
+++ b/log/log.go
@@ -0,0 +1,116 @@
+package log
+
+import (
+	"fmt"
+	"log"
+	"os"
+)
+
+const (
+	LevelTrace = iota
+	LevelDebug
+	LevelInfo
+	LevelWarn
+	LevelError
+	LevelFatal
+)
+
+var LevelName [6]string = [6]string{"Trace", "Debug", "Info", "Warn", "Error", "Fatal"}
+
+type QLogger struct {
+	logger  *log.Logger
+	level   int
+	handler Handler
+}
+
+func New(handler Handler, flag int) *QLogger {
+	var l = new(QLogger)
+	l.logger = log.New(handler, "", flag) //log.LstdFlags|log.Lshortfile)
+	l.level = LevelInfo
+	l.handler = handler
+
+	return l
+}
+
+func NewDefault(handler Handler) *QLogger {
+	return New(handler, log.LstdFlags|log.Lshortfile)
+}
+
+func newStdHandler() *StreamHandler {
+	h, _ := NewDefaultStreamHandler(os.Stdout)
+	return h
+}
+
+var std = NewDefault(newStdHandler())
+
+func (l *QLogger) Close() {
+	l.handler.Close()
+}
+
+func (l *QLogger) SetLevel(level int) {
+	l.level = level
+}
+
+func (l *QLogger) Output(callDepth int, level int, format string, v ...interface{}) {
+	if l.level <= level {
+		f := fmt.Sprintf("[%s] %s", LevelName[level], format)
+		s := fmt.Sprintf(f, v...)
+		l.logger.Output(callDepth, s)
+	}
+}
+
+func (l *QLogger) Write(s string) {
+	l.logger.Output(3, s)
+}
+
+func (l *QLogger) Trace(format string, v ...interface{}) {
+	l.Output(3, LevelTrace, format, v...)
+}
+
+func (l *QLogger) Debug(format string, v ...interface{}) {
+	l.Output(3, LevelDebug, format, v...)
+}
+
+func (l *QLogger) Info(format string, v ...interface{}) {
+	l.Output(3, LevelInfo, format, v...)
+}
+
+func (l *QLogger) Warn(format string, v ...interface{}) {
+	l.Output(3, LevelWarn, format, v...)
+}
+
+func (l *QLogger) Error(format string, v ...interface{}) {
+	l.Output(3, LevelError, format, v...)
+}
+
+func (l *QLogger) Fatal(format string, v ...interface{}) {
+	l.Output(3, LevelFatal, format, v...)
+}
+
+func SetLevel(level int) {
+	std.SetLevel(level)
+}
+
+func Trace(format string, v ...interface{}) {
+	std.Output(3, LevelTrace, format, v...)
+}
+
+func Debug(format string, v ...interface{}) {
+	std.Output(3, LevelDebug, format, v...)
+}
+
+func Info(format string, v ...interface{}) {
+	std.Output(3, LevelInfo, format, v...)
+}
+
+func Warn(format string, v ...interface{}) {
+	std.Output(3, LevelWarn, format, v...)
+}
+
+func Error(format string, v ...interface{}) {
+	std.Output(3, LevelError, format, v...)
+}
+
+func Fatal(format string, v ...interface{}) {
+	std.Output(3, LevelFatal, format, v...)
+}
diff --git a/log/log_test.go b/log/log_test.go
new file mode 100644
index 0000000..6d70f06
--- /dev/null
+++ b/log/log_test.go
@@ -0,0 +1,16 @@
+package log
+
+import (
+	"os"
+	"testing"
+)
+
+func TestStdStreamLog(t *testing.T) {
+	h, _ := NewDefaultStreamHandler(os.Stdout)
+	s := NewDefault(h)
+	s.Info("hello world")
+
+	s.Close()
+
+	Info("hello world")
+}