This paper introduces the design of optics, constant current source system and protective circuit and constant temperature control unit of a high-power semiconductor laser therapeutic equipment. It uses a fiber coupled 980 nm with maximum power output of 10 W as effective light source, 635 nm semiconductor laser as aiming beam. The functions such as operation mode, output power, pulse width and pulse cycle could be easily set through the LCD touch screen. It has a very good prospect of application in cosmetic dermatology.