diff --git a/hgdriver/hgdev/hg_scanner_239.cpp b/hgdriver/hgdev/hg_scanner_239.cpp
index d311b05..b607265 100644
--- a/hgdriver/hgdev/hg_scanner_239.cpp
+++ b/hgdriver/hgdev/hg_scanner_239.cpp
@@ -1719,7 +1719,7 @@ int hg_scanner_239::get_device_log(string &logpath)
 		return ret;
 
 	ofstream f;
-	f.open(save_path,ios::out | ios::app);
+	f.open(save_path,ios::out | ios::trunc);
 	if (!f.is_open())
 		return SCANNER_ERR_CREATE_FILE_FAILED;