diff --git a/function.go b/function.go
new file mode 100644
index 0000000..d1658b9
--- /dev/null
+++ b/function.go
@@ -0,0 +1,61 @@
+package grlogs
+
+//传入一个字符串，返回一个加密后的md5
+func Md5(str string) string {
+	data := []byte(str)
+	has := md5.Sum(data)
+	md5str := fmt.Sprintf("%x", has) //将[]byte转成16进制
+	return md5str
+}
+
+func Md5File(filePath string) string {
+	hash := md5.New()
+	data, _ := ioutil.ReadFile(filePath)
+	hash.Write([]byte(data))
+	md5str := hex.EncodeToString(hash.Sum(nil))
+	return md5str
+}
+
+func GetPackageName() string {
+	packpath := reflect.TypeOf(Empty{}).PkgPath()
+	if idx := strings.Index(packpath, "/"); idx > 0 {
+		return packpath[:idx]
+	} else {
+		return packpath
+	}
+}
+
+func GetCwd(filepath ...string) string {
+	_, filename1, _, _ := runtime.Caller(0)
+	filename2, _ := os.Getwd()
+	if !strings.HasSuffix(filename2, GetPackageName()) {
+		paths := append([]string{path.Dir(filename1), "/../../"}, filepath...)
+		return path.Join(paths...)
+	} else {
+		paths := append([]string{filename2, "/"}, filepath...)
+		return path.Join(paths...)
+	}
+}
+
+func SetCwd() error {
+	_, filename1, _, _ := runtime.Caller(0)
+	filename2, _ := os.Getwd()
+	if !strings.HasSuffix(filename2, GetPackageName()) {
+		paths := append([]string{path.Dir(filename1), "/../../"})
+		return os.Chdir(path.Join(paths...))
+	} else {
+		paths := append([]string{filename2, "/"})
+		return os.Chdir(path.Join(paths...))
+	}
+}
+
+func RandString(length int) string {
+	str := "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+	bytes := []byte(str)
+	result := []byte{}
+	r := rand.New(rand.NewSource(time.Now().UnixNano()))
+	for i := 0; i < length; i++ {
+		result = append(result, bytes[r.Intn(len(bytes))])
+	}
+	return string(result)
+}
diff --git a/log.go b/log.go
index 17b4c97..1b6f97e 100644
--- a/log.go
+++ b/log.go
@@ -6,7 +6,6 @@ import (
 	"fmt"
 	"github.com/astaxie/beego"
 	"github.com/astaxie/beego/logs"
-	"lot.gaore.com/library/common"
 )
 
 const (
@@ -75,7 +74,7 @@ func GetLogger(name string) *Logger {
 		}
 
 		conf1 := FileLogConfig{
-			Filename: common.GetCwd(fmt.Sprintf("runtime/logs/%s.log", name)),
+			Filename: GetCwd(fmt.Sprintf("runtime/logs/%s.log", name)),
 			Level:    LEVEL_ALL,
 			Maxlines: 0,
 			Daily:    true,