diff --git a/client/operation.go b/client/operation.go
index 6687ce6..addd1ff 100644
--- a/client/operation.go
+++ b/client/operation.go
@@ -289,7 +289,7 @@ func (hc *houstonClient) launch(meta *procmeta) error {
 		return err
 	}
 
-	stdReader := func(jobName string, r io.ReadCloser, index int, logfile string) {
+	stdReader := func(jobName string, r io.ReadCloser, index int, logfilePath string) {
 		defer func() {
 			reco := recover()
 			if reco != nil {
@@ -311,8 +311,7 @@ func (hc *houstonClient) launch(meta *procmeta) error {
 
 		reader := bufio.NewReader(r)
 		var logWriter func([]byte)
-		if len(logfile) > 0 {
-			logfilePath := path.Join("logs", logfile)
+		if len(logfilePath) > 0 {
 			targetFile, err := os.OpenFile(logfilePath, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0666)
 			if err == nil && targetFile != nil {
 				defer func() {
@@ -333,7 +332,7 @@ func (hc *houstonClient) launch(meta *procmeta) error {
 					}
 				}
 			} else {
-				logger.Println("failed to create log file :", logfilePath)
+				logger.Println("failed to create log file :", logfilePath, err)
 			}
 		} else {
 			logWriter = func(buff []byte) {
@@ -458,6 +457,12 @@ func (hc *houstonClient) launch(meta *procmeta) error {
 		return v
 	})
 
+	if len(evalfile) > 0 {
+		logfolder := path.Join(path.Dir(meta.cmd.Args[0]), "logs")
+		os.MkdirAll(logfolder, 0666)
+		evalfile = path.Join(logfolder, evalfile)
+	}
+
 	go stdReader(meta.name, stdout, index, evalfile)
 	logger.Println("startChildProcess :", meta.cmd.Args)