diff --git a/constant_unix.go b/constant_unix.go
new file mode 100644
index 0000000..7de33c5
--- /dev/null
+++ b/constant_unix.go
@@ -0,0 +1,8 @@
+//go:build unix
+// +build unix
+
+package f5
+
+const (
+	SYS_LOG_ROOT = "/data/logs/%s/logs/"
+)
diff --git a/constant_windows.go b/constant_windows.go
new file mode 100644
index 0000000..a7a538f
--- /dev/null
+++ b/constant_windows.go
@@ -0,0 +1,8 @@
+//go:build windows
+// +build windows
+
+package f5
+
+const (
+	SYS_LOG_ROOT = "d:/linux_root/data/logs/%s/logs/"
+)
diff --git a/syslog.go b/syslog.go
index baa5f77..e166699 100644
--- a/syslog.go
+++ b/syslog.go
@@ -4,7 +4,6 @@ import (
 	"fmt"
 	"os"
 	"q5"
-	"runtime"
 	"sync"
 	"time"
 )
@@ -20,9 +19,7 @@ const (
 )
 
 const (
-	SYS_LOG_ROOT_LINUX   = "/data/logs/%s/logs/"
-	SYS_LOG_ROOT_WINDOWS = "d:/linux_root/data/logs/%s/logs/"
-	SYS_LOG_FILENAME     = "log_%d_%s.log"
+	SYS_LOG_FILENAME = "log_%d_%s.log"
 )
 
 type LogMsgNode struct {
@@ -132,7 +129,7 @@ func (this *SysLog_) goSaveToFile() {
 		this.botNode = nil
 		this.msgMutex.Unlock()
 		if workNode != nil {
-			logDir := this.GetLogDir()
+			logDir := fmt.Sprintf(SYS_LOG_ROOT, GetApp().GetPkgName())
 			fileName := fmt.Sprintf(TGLOG_FILENAME, os.Getpid(), time.Now().Format("20060102"))
 			q5.ForceCreateDir(logDir)
 			if f, err := os.OpenFile(logDir+fileName, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0666); err == nil {
@@ -147,12 +144,3 @@ func (this *SysLog_) goSaveToFile() {
 		}
 	}
 }
-
-func (this *SysLog_) GetLogDir() string {
-	pkgName := GetApp().GetPkgName()
-	var logDir string = fmt.Sprintf(SYS_LOG_ROOT_LINUX, pkgName)
-	if runtime.GOOS == "windows" {
-		logDir = fmt.Sprintf(SYS_LOG_ROOT_WINDOWS, pkgName)
-	}
-	return logDir
-}