Six months after ACL rupture, the main focus is on muscle strength training, balance training and flexibility training. Six months after ACL rupture, the ligament has been repaired and the strength of the ligament has basically returned to normal. At this time, the main focus is on muscle strength, balance and flexibility training and other advanced motor functions. 1. Muscle strength training: knee joint 0～45° half squatting, twice a day, 15 minutes each time, gradually transitioning to full squatting under protection. 2. Balance training: the main purpose is to increase the sense of proprioception, can be in the balance board or jogging on the cushion, steps before the downward practice, 2 times a day, 15 minutes each time. 3. Flexibility training: jogging forward at a constant speed, twice a day, 30 minutes each time. Exercises for 6 months after ACL rupture should be performed under the guidance of a doctor to avoid complications such as joint, ligament and muscle injuries, which may delay the recovery progress.