There has been a major development in rehabilitation techniques after anterior cruciate ligament (ACL) reconstruction of the knee joint. We propose the influence of sports on intra-articular ligament biomechanics, the rehabilitation of common compound injuries in ACL injuries, and the comprehensive rehabilitation treatment for competitive athletes to resume competitive competition after ACL surgery, and propose rehabilitation treatment countermeasures for the existing problems. 1, autologous, homogeneous ACL has good stiffness and strength, especially has better viscoelasticity. The effect of homogeneous ACL in different preservation treatment methods on the biological properties of ligaments is a problem that should be considered in rehabilitation treatment, the amount of load given and the timing of increasing the load. 2. The joint ligament-bone junction is more sensitive to stress, and the correct rehabilitation training method has a positive impact. Braking reduces the stress and leads to significant ligament degeneration. In the early postoperative period, progressive weight-bearing is given to slow down the loss of stress degeneration. The load training in each rehabilitation phase of competitive athletes should consider both the impact of the stress on the ligaments in the joint and the ability of the junction of the bone to withstand the effect of stress, in order to reduce the negative impact of stopping training. 3. The mechanical effects of open and closed chain exercises on the knee cruciate ligament are still controversial. Different training methods make the joint flexion and extension activities affect the coordinated contraction and relaxation of the active, synergistic and antagonistic muscles to control the movement of the tibial condyle in the anterior-posterior direction and avoid shear stress and longitudinal tension on the transplanted ligament. 4, artificial ligament as ligament injury repair material, clinical application results vary greatly. Advantages: ① with more ideal strength, can be earlier rehabilitation and sports training, suitable for athletes who will participate in competitive games in the short term; ② avoid the complications of injury at the site of autologous extraction. ③The safety of artificial ligaments gradually increases with the improvement of materials. Problems of artificial ligaments and rehabilitation countermeasures: ① The wear and tear of artificial ligaments is still a problem to be considered in selecting indications, and rehabilitation training still needs to consider the effect of load on new ligaments in different states; ② Wear and stress fatigue of ligaments and bone surfaces are the main reasons for the failure of previous artificial ligaments, and artificial ligaments lack the viscoelasticity of ligaments. It suggests that the combination of surgical techniques and reasonable rehabilitation techniques can reduce the risk of re-injury; ③ Artificial ligament reconstruction techniques cannot restore the proprioceptive function of normal ligaments, but the overall training of the balance and stability function of the joint can promote the recovery of the overall proprioception of the joint. We implemented postoperative proprioceptive training for patients with knee and ankle artificial ligament reconstruction at an early stage, especially for competitive athletes who started a special rehabilitation program early in the postoperative period, which alleviated the effects of joint proprioceptive decrements caused by training suspension.