The main precautions to take 7 to 8 weeks after an ACL rupture in the knee are to avoid pain during training and activities. Avoid running and jumping until sufficient muscle strength is achieved. Seven to eight weeks after ACL rupture belongs to the third postoperative phase, in which the goal of rehabilitation is to restore the maximum angle of normal joint motion. Lower extremity mobility is achieved with a clear and well-controlled step down from a ladder of approximately 20 cm in height, and care is taken to protect the patellofemoral joint. At this stage, the patient already has a certain degree of athletic ability, muscle strength and joint mobility are also significantly higher than before, to exercise the endurance and flexibility of the lower to the main. The main rehabilitation content includes static squatting exercises, down steps, stirrups, strides, proprioception and flexibility training. However, muscle strength is not yet sufficient at this stage, and together with the increase in athletic ability, it is a stage where sports injuries are more likely to occur. If more obvious pain occurs during training, it means that some injuries have occurred, and it is necessary to pause in time to rest and seek medical attention if necessary. And in the muscle strength is not enough of