Acne is a chronic inflammatory skin disease that involves the sebaceous glands of hair follicles. It occurs in adolescents, mostly on the face, forehead and other sebaceous areas. Some people or areas of acne often form hyperplastic or atrophic (depressed) scars after healing. Laser treatment for acne scarring has gained great attention and rapid development as a treatment method with few side effects, rapid onset of action, and easy operation, and fractional laser treatment has emerged in recent years at the forefront of its research and development. Fractional laser technology is a new type of minimally invasive or even non-invasive skin disease treatment and cosmetic method. The basic principle of its treatment is to use laser heat to damage the wound and activate the keratinocytes at the edge of the damage to make them proliferate and repair the wound. The so-called fractional is actually a laser emission mode, which is a special image generator installed in front of the laser emitter, which can disperse a laser beam into several tiny beams and control the shape of these beams to adapt to different sizes and parts of the treatment wound, the beam irradiates the skin to form a fractional arrangement of micro-holes, i.e. micro-treatment area. The normal skin between the micropores is the raw material for skin regeneration and repair. One advantage of fractional fractions is the small trauma and fast recovery, while also utilizing the normal skin between the micropores. The edges of the micropores are not damaged during treatment and the keratinocytes at their edges are activated and crawl under laser stimulation to rapidly cover and repair the damaged epidermis, while initiating tissue healing mechanisms and stimulating new collagen formation for the purpose of wound repair. At the beginning of the treatment, due to the thermal effect, the original collagen will contract, which also makes the skin tighter and the effect is immediate. After 2-3 treatments, the regeneration and repair of the traumatic skin will be obvious and the acne scar can be improved significantly. In summary, fractional laser technology has the advantages of obvious effects, small trauma, fast recovery and few side effects, and is therefore widely recognized and used in the treatment of acne scars and other skin problems such as scars, pigmentation, wrinkles and skin laxity.