Ligament reconstruction surgery refers to reconstruction of the cruciate ligament of the knee joint and also the patellar ligament, with the knee joint being the main focus, and after the reconstruction of the cruciate ligament, there will be reactions such as transient instability of the knee joint, or joint pain and limitation. While cooperating with the treatment, early functional rehabilitation training should be actively carried out. Quadriceps muscle strength training can be carried out to increase joint stability, and those who have the conditions can go to the gym or rehabilitation department to practice weighted calf kicking or knee half squatting against the wall. Patients can try supine leg raising exercises, adhere to 30-40 minutes daily, moderate training, step by step to avoid strain, can be combined with sports such as swimming, jogging, etc., are helpful for the recovery of ligament reconstruction.