The first aid methods for leg fracture are as follows: 1. reset: use manual reset to restore the fracture initially to the alignment of the limb; 2. fixation: use nearby objects such as sticks and cardboard for fixation, without equipment the affected limb can be tied to the healthy limb; 3. wound hemostasis: bleeding and wounds should be kept clean, use clean clothes and towels for local bandaging to stop bleeding; 4. promptly send to the doctor: observe the swelling, distal blood flow and nerve function of the limb, make a preliminary judgment, and send to the doctor for emergency treatment.