diff --git a/logs/file.go b/logs/file.go
index 16c23de5..9ee7f694 100644
--- a/logs/file.go
+++ b/logs/file.go
@@ -20,7 +20,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"log"
 	"os"
 	"path/filepath"
 	"strings"
@@ -31,7 +30,6 @@ import (
 // fileLogWriter implements LoggerInterface.
 // It writes messages by lines limit, file size limit, or time frequency.
 type fileLogWriter struct {
-	*log.Logger
 	*MuxWriter
 	// The opened file
 	Filename string `json:"filename"`
@@ -91,8 +89,6 @@ func newFileWriter() Logger {
 		Perm:      0660,
 		MuxWriter: new(MuxWriter),
 	}
-	// set MuxWriter as Logger's io.Writer
-	w.Logger = log.New(w, "", log.Ldate|log.Ltime)
 	return w
 }
 
@@ -137,8 +133,6 @@ func (w *fileLogWriter) doCheck(size int) {
 			(w.Daily && time.Now().Day() != w.dailyOpenDate) {
 			if err := w.DoRotate(); err != nil {
 				fmt.Fprintf(os.Stderr, "FileLogWriter(%q): %s\n", w.Filename, err)
-				w.startLock.Unlock()
-				return
 			}
 		}
 	}
@@ -152,9 +146,47 @@ func (w *fileLogWriter) WriteMsg(msg string, level int) error {
 	if level > w.Level {
 		return nil
 	}
-	n := 24 + len(msg) // 24 stand for the length "2013/06/23 21:00:22 [T] "
-	w.doCheck(n)
-	w.Logger.Println(msg)
+	//2016/01/12 21:34:33
+	now := time.Now()
+	y, mo, d := now.Date()
+	h, mi, s := now.Clock()
+	//len(2006/01/02 15:03:04)==19
+	var buf [19]byte
+	t := 3
+	for y >= 10 {
+		p := y / 10
+		buf[t] = byte('0' + y - p*10)
+		y = p
+		t--
+	}
+	buf[0] = byte('0' + y)
+	buf[4] = '/'
+	if mo > 9 {
+		buf[5] = '1'
+		buf[6] = byte('0' + mo - 9)
+	} else {
+		buf[5] = '0'
+		buf[6] = byte('0' + mo)
+	}
+	buf[7] = '/'
+	t = d / 10
+	buf[8] = byte('0' + t)
+	buf[9] = byte('0' + d - t*10)
+	buf[10] = ' '
+	t = h / 10
+	buf[11] = byte('0' + t)
+	buf[12] = byte('0' + h - t*10)
+	buf[13] = ':'
+	t = mi / 10
+	buf[14] = byte('0' + t)
+	buf[15] = byte('0' + mi - t*10)
+	buf[16] = ':'
+	t = s / 10
+	buf[17] = byte('0' + t)
+	buf[18] = byte('0' + s - t*10)
+	msg = string(buf[0:]) + msg + "\n"
+	w.doCheck(len(msg))
+	w.fd.Write([]byte(msg))
 	return nil
 }
 
@@ -264,7 +296,7 @@ func (w *fileLogWriter) deleteOldLog() {
 	filepath.Walk(dir, func(path string, info os.FileInfo, err error) (returnErr error) {
 		defer func() {
 			if r := recover(); r != nil {
-				fmt.Fprintf(os.Stderr, "Unable to delete old log '%s', error: %+v", path, r)
+				fmt.Fprintf(os.Stderr, "Unable to delete old log '%s', error: %v\n", path, r)
 			}
 		}()