On-site first aid for trauma is a part of pre-hospital first aid technique, which is currently considered to contain seven technical aspects, namely on-site CPR, ventilation, extrication, hemostasis, dressing, fracture fixation, and transportation. Which links to implement need to be determined according to the patient’s injury.1.Cardiopulmonary resuscitation: If the patient cannot breathe on his own, cardiopulmonary resuscitation is needed. The CPR operation of trauma first aid is not essentially different from the single CPR operation of sudden cardiac death, but it may affect the operation effect because of the patient’s injury; 2.Ventilation: It is one of the important links of trauma first aid, and for patients without airway injury, it can play the role of improving ventilation by cleaning the airway or even tracheal intubation; 3.Resuscitation: In the field trauma first aid, the real encounter The difficult problem is often to extricate the patient from the traumatic environment. After a disaster or accident, the injured person is often restricted to a fixed position due to their own reasons and the scene situation, which makes on-site extrication need to be very careful, and inappropriate extrication may cause secondary trauma, and the help of firefighters is needed in many cases; 4.Stop bleeding: If there is open trauma on the patient, hemostasis treatment is needed. There are several general methods to stop bleeding in the first aid scene, and the pressure hemostasis method is the most common and simplest method to stop bleeding. In addition, there are compression bandage hemostasis method, gauze filling hemostasis method, padded flexion hemostasis method, clamp hemostasis method and tourniquet hemostasis method, which need to be applied flexibly according to the situation; 5. Bandage: for the exposed open wounds need to be bandaged, the common tools are bandage and triangular towel, the bandaged wounds can reduce pollution and help to stop bleeding. Although it is a trauma site environment, attention should be paid to aseptic operation; 6. Fracture fixation: local fixation and braking are needed when there is bone and joint injury to reduce pain and avoid secondary injury to blood vessels and nerves caused by fracture. The more serious soft tissue injury should also take local fixation, and the fixed equipment can be medical bracket, wooden board, etc., or local materials, such as tree branches, wooden sticks, etc.; 7.Transportation: After simple treatment, the casualties at the trauma site must be sent to the regular hospital for treatment as soon as possible. Attention should be paid when handling to avoid twisting and falling of the injured person, which may cause medical source injury.