The displaced distal fracture of the left ulnar radius can be treated by the following methods: First, external fixation with a plaster or splint by means of manipulative repositioning. After the displaced distal fracture of the ulnar radius occurs, the first step should be manipulative repositioning according to the results shown on the X-ray and the mechanism of injury. If the fracture is successfully repositioned by manipulation, it can be externally fixed with a cast or splint. 4-6 weeks after the removal of external fixation, rehabilitation training can be started to restore the movement of the joint, and the fracture will not be completely healed for about three months. Secondly, surgical treatment should be considered for patients whose conservative treatment is ineffective, especially if the manual repositioning is unsuccessful. Through incision and internal fixation of plate and screw, the fracture end can be accurately reset and the stability of the fracture end can be ensured, which can promote the smooth healing of the fracture, and the patient also needs rehabilitation training after the operation.