The basic principle of first aid is to take active measures to protect the patient’s life, reduce injuries and minimize pain. While giving first aid, it is important to quickly contact the medical institution in order to get further treatment at a later stage. Patients with respiratory and cardiac arrest with fractures should be given cardiopulmonary resuscitation (CPR), and after successful CPR, the fracture should be immobilized and transported to the hospital at a later stage. For trauma first aid, the principle of stopping bleeding first and then bandaging should be done to prevent the patient’s life from being endangered due to hemorrhage. For more than one patient in need of first aid, we should prioritize the rescue of patients with serious injuries. For patients with life-threatening injuries, priority should be given to rescue treatment to prevent dangerous situations. For the patient to carry out the principle of first treatment and then transportation, to do everything. And to do first aid and call for help and the principle of equal importance, in order to get more people to help, improve the effect of treatment.