Laser treatment has become a cosmetic means as it is often utilized clinically to remove spots, moles, hair removal and so on. The action of laser has thermal action, photochemical action, electromagnetic action and biostimulation action, mainly utilizing the biological effect produced by laser on the skin and mucous membrane tissues to treat diseases. The most important feature of laser treatment is that it is non-invasive and has a short recovery time after the procedure. Laser can treat many kinds of skin diseases, but not all skin diseases need laser for treatment, and different laser types treat different diseases, should be targeted selection. Common clinical lasers include carbon dioxide laser, Q-switched ruby laser and emerald laser, the former is mainly used for its gasification, carbonization or cutting effect, commonly used in the treatment of pigmentation, freckles, skin cancer, viral warts and other skin growths; the latter is mainly used for the treatment of pigmented skin diseases, such as nevus of ota, blue nevus, nevus of freckles, nevus of Ito, etc. In addition, there are pulsed lasers, which are mainly used for the treatment of skin diseases. In addition, there are pulse lasers, which are mainly applied to the treatment of vascular skin diseases such as bright red nevus, capillary dilatation, spider nevus, hemangioma, etc. Fractional lasers can treat acne pits and scars left behind by acne, with remarkable effect; picosecond lasers are mainly used to remove tattoos, tattooing and other pigmented diseases.