If a patient suffers from swelling and pain in the leg after a traumatic injury in a car accident, it is important to first limit weight bearing and leg flexion and extension activities to avoid repeated stretching of the injured tissue and aggravation of swelling and pain after the force is applied. In addition, when limiting activities, it is important to consult a doctor in a timely manner and have a radiographic examination to exclude fractures caused by trauma. If there is no fracture, but only a simple soft tissue injury, swelling, can be within 24 hours of injury, cold compresses and non-steroidal anti-inflammatory drug treatment. After 24 hours, you can apply blood-stasis activating drugs and oral treatment to promote blood circulation in the leg and promote the swelling to subside, and you must elevate the affected limb during rest to facilitate venous return and swelling to subside. If there is a fracture after the film, depending on the type of fracture and the degree of displacement, we should choose conservative plaster brace or brace external fixation or surgical treatment.