Usually your loongson machine has preinstalled an OS ,the easiest way to install a new one is to download the tarball of another system,then unzip it to a free partition.

The English Debian Linux is now available to download from Lemote homepage , http://www.lemote.com/upfiles/OS/Debian-en/

If your machine does not have preinstalled an OS or your OS does not work,see section 2 directly.