The time users have made selection of green laser line for accurate line targeting and line cutting on wooden board, it can be easily mounted on processing machineries. On both vertical and horizontal working surfaces, users can always make the easiest mounting and installation of green line laser alignment. During the practical line generating work, it will project a highly bright and visible green laser line, which makes a clearly visible line to make the most efficient instruction for workers. The noncontact green laser line instructs the whole process of furniture making work. Whatever kind of working environment, factory workers can always make the easiest line positioning, thus it has no worrying about wood material wasting and time waste on the most annoying line positioning work.