Minor ACL injuries usually require braking and rest without surgery, and can be followed by muscle strength training and joint mobility training. Minor ACL injuries are usually characterized by ligament edema without ligament tears or ruptures. At this time, immobilization and rest are the mainstay, and a brace or plaster may be used for external immobilization. The duration of immobilization is related to the severity of the symptoms, and mostly lasts for 3~4 weeks. When the external fixation is removed, the muscle strength around the knee joint will decrease to a certain extent, and mild limitation of the knee joint and gait abnormality may also occur. Muscle strength training: patients sit on a chair or training chair, hip flexion to 90 °, knee flexion and extension movements, several times, you can use elastic band, sandbags and other tools to increase resistance. Joint mobility training: start knee flexion and extension exercises from the range of no or slight pain, and hold it at the maximum angle for a period of time, and apply ice for 20~30 minutes immediately after the exercises. After the occurrence of minor ACL injury, it is necessary to consult a doctor in time, standardize the treatment, and follow the doctor’s instructions to carry out rehabilitation training to promote the recovery of the injury.