Compared with traditional mechanical processing, laser processing can be applied in a wider range combined with galvanometer scanning system. The laser application has absolute many advantages. Different kinds of laser processing are used for different materials in different fields, such as applications of lasers in physics, application of laser in spectroscopy, application of laser in metrology and so on. What's more, industrial laser cleaning, laser beam welding, and 3d laser scanning technology are more and more used nowadays.