Acne occurs in adolescents and can be classified as mild, moderate or severe acne according to the characteristics of the lesions. Currently, the treatment of acne is mainly based on medication, which can achieve good results for mild to moderate acne, but some patients have poor results, especially for severe acne. Due to the toxic side effects of drugs on the liver, kidneys and other organs, many patients are unable to adhere to the medication, making acne recurring, which brings great mental stress and psychological burden to patients. The 1450 nm semiconductor laser is a new type of laser treatment instrument developed in recent years, which is used to treat acne on the face and back with satisfactory results; the device uses water molecules as the main target and can penetrate to about 1 mm of the dermis. At the same time, the epidermis can be protected from damage by the injection of coolant on the skin surface, thus increasing its safety. Acne can be treated without any medication, and it only needs to be treated once or twice a month, without affecting work and life. The instrument’s thermal damage energy can also act on the upper middle of the dermis where wrinkles are formed, making collagen fibers re-form and re-arrange, which has a good effect on the fine wrinkles at the corners of the eyes and the atrophic scars left by acne. Once a month, 4~5 times in a row, you will be able to achieve more satisfactory results.