The principle of photon hair removal is to irradiate the normal epidermis through the selective photothermal decomposition of patented intense pulse light source, penetrate the skin and reach the root of hair follicle. Melanin in the hair shaft and hair follicle is absorbed and converted into heat energy, thus raising the temperature of hair follicle. When the temperature rises to a high enough level, the hair follicle structure is irreversibly damaged, and the damaged hair and hair follicle are removed through a natural physiological process, while other surrounding tissues are not damaged, thus realizing painless hair removal.