The laser possesses the features of monochromaticity, directivity, high brightness and heat, pressure and electromagnetic effect on tissue. A variety of laser instruments is used in medical fields. The laser instrument is not only an apparatus of medical research, but also used in diagnose and treatment of disease. The good effect of application makes it an important means in defeating the disease. Keyword: CO2 Laser, Biomedicine, silicon controllable, beam energy, safety protection.