Meniscus is a kind of fibrous cartilage, which has no blood supply itself, and its nutrition mainly comes from synovial fluid, only the marginal part connected with the joint capsule gets some blood supply from synovium. Therefore, except for the marginal part of the meniscus, which may be repaired by itself, meniscus rupture generally cannot be repaired by itself. Therefore, surgery is the best form of treatment. The old traditional method is to open the knee joint and perform a total meniscectomy, which is very damaging, bleeding and slow to recover. The minimally invasive arthroscopic technique, on the other hand, is less damaging, less bleeding, and quicker recovery. Suturing or repairing the damaged meniscus can get very good results. Arthroscopic technology has been recognized as the most ideal means of diagnosis and surgical treatment of meniscus injuries, in some foreign countries, if the meniscus is damaged by surgery, it is regarded as “breaking the law”. First, change the meniscus arthroscopic total excision to partial excision We use partial meniscectomy, due to more in line with the physiology of the knee joint, fewer postoperative complications, fast recovery, has become the treatment of meniscus injuries are widely adopted, in a certain sense, can be replaced by the total meniscectomy of a good surgical method. Second, retain as much meniscus as possible Most of the scholars through the arthroscopic partial meniscectomy of clinical and research concluded that in addition to the broken or mechanical properties of the unstable part of the meniscus, should not be more resection; and at the same time as far as possible to retain a concave smooth meniscus edges and meniscus fibrous ring around the meniscus, especially close to the lateral meniscus N muscle holes. Partial resection of the meniscus is preferred to total resection, and it is suggested that degenerated but not ruptured menisci or even ruptured menisci that do not affect the normal biomechanics of the joint should not be resected. Repair the damaged meniscus as much as possible. After partial meniscectomy, although some meniscus function can be preserved, it is certainly not as good as a complete meniscus. Even if a small part of the meniscus is removed, the pressure will be abnormal and lead to early degeneration of the meniscal cartilage. The meniscus should be preserved as much as possible, and the best way to heal the rupture is to close the rupture with a fast-fix suture. We have been able to preserve the intact meniscus by using fast-fix suture to close the meniscus, which has been a boon to our patients. However, meniscal injuries are not effective in repairing tears other than marginal separation due to their blood supply. Currently, meniscal repair is limited to the lateral 10% to 25% of the meniscus.