Treatment principle is based on the role of selective photothermolysis, as hair follicle and hair shaft are rich in melanin, melanin in the hair bulb matrix distribution between  cells and transfer to the structure of hair shaft, the regard melanin as target to do hair removal treatment, after the target and its carrier ( hair follicle and hair follicles surrounding tissues) absorb the tremendous energy, the temperature increased sharply, leading to hair follicle tissues and surrounding hair follicle tissues damage, hair loss the native environment, it must be completely removed.