Scar is the collective name of the appearance morphology and histopathological changes of normal skin tissue caused by various traumas, and it is the inevitable product of the repair process of human trauma. When the growth of scar exceeds a certain limit, various complications will occur, such as the destruction of appearance and functional activity disorder, and it will bring great pain to patients, especially the scar left by burns, scalds and severe trauma. At present, common clinical scars can be classified as superficial keloid scars, hyperplastic keloid scars, atrophic keloid scars and keloid scars, among which keloid scars are more common. The prevention of keloid scars is very important, firstly, aseptic technique should be strictly performed to avoid infection. Emphasis should be placed on the suturing of the skin incision, and the edges of the incision should be accurately aligned. Absorbable sutures can also be chosen to minimize tissue irritation. It is also important to emphasize the orientation of the skin surgical incision, which in principle should follow the skin line and avoid straight incisions in joints and functional areas as much as possible. When dealing with burns, the wound should be properly treated to prevent infection and promote early healing, and if necessary, early skin grafting is required.