If the patient has trauma due to the blow or bump of external objects, call 120 and then perform simple first aid, pay attention to the correct method of first aid to avoid aggravating the injury. 1. Evacuate the scene: if the scene environment is dangerous and easy to induce secondary injury, take the injured person out of the scene immediately; 2. Ensure ventilation: ventilation is one of the important aspects of trauma first aid, for patients without airway injury, by cleaning For patients with no airway damage, ventilation can be improved by cleaning the airway or even by tracheal intubation. For patients with respiratory and cardiac arrest, cardiopulmonary resuscitation treatment is needed in time; 3. Hemostasis treatment: such as pressure hemostasis, compression bandage hemostasis, gauze stuffing hemostasis, padded flexion hemostasis, clamp hemostasis and tourniquet hemostasis, etc. Patients need to apply flexibly according to the situation to avoid shock due to excessive blood loss; 4. Bandage treatment: for exposed open wounds, bandages are needed. Commonly used tools are bandages and triangular towels. The bandaged wound can reduce pollution and help stop bleeding. When bandaging, patients need to pay attention to aseptic operation, with bone and joint injuries require local fixation, braking, used to reduce pain, and avoid causing secondary damage to blood vessels and nerves. In addition, for more serious soft tissue injuries, local fixation should be taken, which can be medical splints, braces, etc., or tree branches, wooden sticks, etc.; 5. Transfer treatment: After simple treatment, the casualties at the trauma site must be transferred to the regular hospital for treatment as soon as possible. Attention needs to be paid when transporting to avoid medical source injury due to twisting and falling of the casualty. In addition, after the patient is admitted to the hospital, he/she needs to improve the relevant examination and undergo surgical treatment or conservative treatment according to the specific situation.