Before the advent of laser aesthetics, skin care or other conditions that required treatment were cared for and treated through cosmetic life or plastic surgery. With the development of medical aesthetic laser technology, laser aesthetic has been widely used in the field of skin aesthetics and has shown good treatment effects on diseases that required surgical treatment and were more damaging in the past, such as hemangioma, nevus of Ota, pigmentation, acne, etc. Nowadays, although laser cosmetic surgery has the advantages of less trauma, high safety, less pain and less bleeding, some damage to the skin can still be caused during the treatment process and affect the physiological function of the skin. Therefore, how to prevent complications after laser cosmetic treatment, such as discoloration, redness and swelling, and how to promote skin regeneration and repair to achieve the cosmetic effect, are issues that need the attention of the laser operator, as well as the care before and after the laser treatment. Before laser treatment care: Psychological care: Patients do not have sufficient understanding of the process and effects of laser treatment and some of the possible side effects. Before laser treatment, the doctor should take the initiative to communicate with the patient and explain patiently and carefully about the efficacy, adverse reactions (scarring, pigmentation, etc.) and pain, including the principle of laser treatment, the process and post-operative reactions, and it is best to show the patient some case photos of the treatment to enhance the patient’s confidence and eliminate tension. It is also necessary to explain the possible local reactions after surgery, including discoloration, edema, inflammation, etc., to eliminate the patient’s fear. Post laser treatment care: Sun protection: Whether it is pigmented, vascular dermatosis or the inflammatory phase after photoaging, the skin at this stage is in a highly sensitive state, inflammation is obvious, if stimulated by light the basal melanocytes may produce a large amount of melanin, resulting in post-operative skin pigmentation, therefore physical sun protection or sunscreen needs to be used after surgery. The key is that it is difficult to completely block UV radiation to the new skin after surgery if only physical sunscreen is used, especially for patients with sensitive skin, so it is necessary to combine sunscreen with sunscreen to block UV radiation during the recovery period after laser treatment in addition to physical sunscreen. The choice of sunscreen should be based on the doctor’s recommendation. The choice of sunscreen index: for protection against medium-wave ultraviolet rays (UVB), the SPF value should be referred to and patients should be instructed to use SPF30 or SPF30+ sunscreen. Protection against UVA needs to refer to the protection index (PA) value, which is usually expressed as PA+ a PA+++, and patients are instructed to use PA+++ sunscreens. Promote skin regeneration and repair: The skin will be damaged to varying degrees after laser treatment. Use suitable medical skin care products for effective skin care to repair damaged skin within 3-6 months after treatment. The role of diet on skin repair is also very critical, use some foods containing protein, fat and sugar, vitamins and trace elements can affect the normal metabolism and physiological functions of the skin, avoid eating foods containing copper and B vitamins, eat less spicy food, but should eat more foods rich in vitamin C and vitamin A.