The walking swelling after four months of plate fixation of ankle bone fracture should be treated according to different reasons, and the common reasons include long time of external fixation, short time of rehabilitation exercise and delayed healing or even non-healing of the fracture, etc. The treatment includes general treatment and physical therapy. 1. Excessive time of external fixation: Due to the long time of external fixation after fracture, the blood circulation in the leg is not recovered well, which will lead to swelling when walking, and timely rehabilitation exercises, such as ankle dorsiflexion and extension activities. 2. Rehabilitation exercise for a short period of time: after ankle bone fracture plate fixation, if you do not start rehabilitation exercise at an early stage, or start rehabilitation training for too short a period of time, it will affect the blood circulation due to the atrophy of soft tissues and ligaments, which will lead to obstruction of venous return. It may lead to walking swelling when walking. At this time, we should elevate the affected limb appropriately, massage it moderately, and start the rehabilitation exercise at an early stage. 3. Delayed healing or even non-healing of fracture: after the internal fixation of ankle bone fracture plate, if the fracture has delayed healing or even non-healing occurs, there will also be walking swelling after four months of internal fixation. X-ray examination and CT examination are needed to determine whether there is delayed healing of the fracture, and then consider whether a second operation is needed. If the ankle bone fracture plate fixation four months walking swelling, it is recommended to go to the hospital in a timely manner, improve the examination, under the guidance of the doctor for standardized treatment.