A deep cut by a knife will bleed profusely. Before going to the hospital, you need to wrap the wound with gauze or a relatively clean towel, and then press the bleeding area firmly from the outside to stop the bleeding with pressure. After simple treatment, go to the hospital as soon as possible, disinfected by a doctor, first flush the wound with hydrogen peroxide to remove dirt or foreign bodies in the wound. If a nerve or large blood vessel is damaged and broken, a severed end anastomosis is required. After the repair of the damaged tissue is completed, the damaged subcutaneous tissue and skin are then sutured, and the wound surface needs to be treated with a sterile dressing. In addition, it is necessary to inject tetanus antitoxin within 24 hours of injury, and after treatment, go to the hospital according to medical advice to change the medication on time.