All traumatic injuries have scar growth, only depending on the severity of the injury. After the injury, the tissue defect is completely repaired by the original nature of the cells is the ideal repair. If the tissue defect is too large to be completely repaired by the original nature of the cells, and is replaced by fibroblasts, then it is not an ideal repair, and scarring is bound to occur. The classification of wound healing is: Phase I healing: the wound defect repair is mainly by the original cells, containing only a small amount of fibrous tissue, and the scar proliferation is light. Phase II healing: fibrous tissue repair is dominant, and scar growth is heavy, affecting appearance and function. Therefore, if the injury is small or the surgical incision is fine with small sutures, the scar growth is less. While large wounds and poorly handled foreign body retention infection will inevitably cause heavier scar growth. Therefore, proper wound management is the key to prevent scar growth, including proper suturing, dressing change, surgery, proper body position and activities. When the wound is healed or incompletely healed, timely and correct scar pressure treatment or brace treatment will play a proactive role in preventing the treatment of scar growth and contracture and reduce the scar deformity. Thinking of scar prevention when injured is a test of the quality of doctors and patients, and popularizing the knowledge of rehabilitation is beneficial to patients and society.