First aid for fracture includes the following purposes: 1. to keep the fracture in a stable state, because after fracture, the fracture is often unstable, the fracture is an interruption of the continuity and integrity of the bone, at this time the fracture is in an unstable state, the activity will cause severe pain. 2. to reduce bleeding or stop bleeding, because after fracture, the broken end will bleed a lot, we must pay attention to whether there is hemorrhagic shock, and blood transfusion should be carried out in a timely manner. 3. Prevent secondary injury, because after the fracture, the broken end forms a relatively sharp oblique section, which may cause damage to the surrounding uninjured tissues, such as blood vessels, nerves, and muscles, so the first aid purpose allows the fracture to be reset or stabilized to avoid damage to these surrounding tissues, organs, and nerves and blood vessels. 4. Avoid hemorrhage or infection, there is timely bandaging, which can prevent further contamination.