Knee postoperative exercise rebound mostly due to contracture of the surrounding soft tissues, the formation of scar tissue after surgery, it is recommended to progress step by step, adhere to the scientific rehabilitation training, can be hot packs before training, to reduce pain, to achieve the length of training. The soft tissues around the knee joint, such as muscles and ligaments, are elastic and have a tendency to retract after being pulled and stretched. After the soft tissue retraction, the angle of knee flexion will be reduced and rebound. Hot packs can be applied to the knee joint before exercise to relax the soft tissues. The joint stiffens after surgery and scar tissue forms. The elasticity of the scar tissue is poor, and the exerciser will feel that the angle of flexion decreases. At this time, it is necessary to insist on scientific training in order to get a good training effect. Rehabilitation training is based on persistence and science, and rebound is common before good results are achieved. Medication and rehabilitation training should be completed under the guidance of a doctor.