The stitches were removed 2 weeks after ACL reconstruction, and by the 3rd week, the swelling and stiffness of the joint were significantly reduced. 3 to 5 weeks training plan is as follows: 1. Tension and relaxation of the quadriceps, the goal of exercise is to be able to fully control, easily do straight leg raise, knee joint can be fully straightened, passive flexion and extension of the knee joint mobility to 0 to 90 degrees, you can practice pushing the patella, maintain a better patellar movement, in the knee swelling If the swelling of the knee joint decreases, continue the above exercises. 2.Increase prone knee flexion exercises, prone knee flexion exercises, knee extension strength exercises in the range of knee joint near extension (0-20 degrees), 3 times a day, 2 sets of 20 sets each, with 2 minutes rest between sets. 3, resistance ankle plantar flexion training, against external resistance, (available elastic band) toe force down and up hook training. 4, knee mobility exercise, to 5 weeks, you can increase mobility exercises, passive knee flexion 0 ~ 100 degrees, active leg flexion 0 ~ 80 degrees, can sit on the edge of the bed or chair training. 5.Standing position straight leg raise training, back hook leg training.