The precautions to be taken 7~8 weeks after ACL rupture mainly include preventing adhesion, avoiding jumping and sharp turning sports, and being alert to infection of the knee joint. 1. Preventing adhesion: 7~8 weeks after ACL rupture, in order to prevent adhesion, patients can carry out passive knee flexion and extension mobility training, with the mobility ranging from 0~140 degrees, and active knee flexion and extension mobility training, with the mobility ranging from 0~120 degrees. 2. Avoid jumping and sharp turning sports: appropriate muscle strength and gait training can be carried out, but should avoid jumping and sharp turning sports, such as basketball, soccer, etc., otherwise it is easy to cause secondary injury to the knee. 3. Be alert to the infection of the knee joint: If the temperature continues to rise and the swelling of the knee worsens in 7-8 weeks after the operation, the patient needs to be alert to the infection of the knee joint. Related patients are advised to consult a doctor in time to clarify the cause of the disease and target treatment and therapy.