Commonly used first aid methods are as follows: First, cardiopulmonary resuscitation, which is generally used for patients with acute respiratory and cardiac arrest, including chest compressions, artificial respiration, open airway, tracheal intubation and other operations. Second, electric defibrillation, used for patients in acute coma, ventricular fibrillation or ventricular flutter. Third, wound dressing to stop bleeding, local pressure dressing or ligation of the proximal limb of the wound to stop bleeding. Fourth, external splinting is usually used for fractures of the extremities. If there is no splint at the scene, hard cardboard or tree branches can be used to do the fixation. Fifth, the spinal handling method, which is very important, is used for fractures of the cervical, thoracic, lumbar and other spinal vertebrae. Handling is very delicate, if not careful can lead to secondary injury to the spine, resulting in serious sequelae.