ACL injury is one of the most common and serious sports trauma, ACL tear can cause knee instability, untimely treatment or improper treatment will cause knee dysfunction and can cause late degenerative osteoarthritis, serious knee instability will soon lead to severe osteoarthritis. In some patients, due to the large violence of the injury, often combined with other major structural injuries, improper diagnosis and treatment will delay the treatment, while due to the increasing attention to the mechanical function of the anterior cruciate ligament, as well as the functional instability caused by the injury, the resulting knee joint can not meet the needs of daily life and sports, and can lead to a series of sequelae of the knee joint, so it should and must be surgically treated to rebuild the ligament Therefore, surgery should and must be performed to reconstruct the ligament and restore its normal physiological function. In the last 10 years, the repair and reconstruction of ACL injury has become an important research topic in the field of orthopedics and sports trauma, and nowadays, the repair and reconstruction of ACL injury has made great progress in terms of theory, surgical techniques, surgical instruments and equipment, and is a very mature procedure with very satisfactory clinical results. Arthroscopic technique is the first minimally invasive technique used in orthopedics. Since its application in clinical practice, it has greatly improved the diagnosis rate of joint diseases and has accomplished many intra-articular lesions that are difficult to perform with conventional surgery. It has not only expanded from the knee joint alone at its inception to include the shoulder, elbow, wrist, hip, ankle and even interphalangeal joints, but has also evolved from the simple management of meniscal injuries and synovial disease to the ability to perform meniscal transplants, anterior and posterior cruciate ligament reconstruction and cartilage defect transplantation. In addition, with the improved performance of arthroscopy and improved surgical instrumentation, the time to perform arthroscopic surgery has been significantly reduced, while the accuracy and targeting of treatment has been significantly improved. The increasing maturity of arthroscopic techniques, the simplification of microscopic surgery, and the reduction of interference with joint function have led to the expansion of the indications for arthroscopic surgery.