Arthroscopic surgery is a minimally invasive surgical treatment for bone and joint, which has the advantages of direct observation and accurate diagnosis; comprehensive examination and not easy to miss; small trauma and quick recovery. The insertion port of arthroscope and surgical instruments is only 5mm, and it usually takes about 5-7 days to be discharged from the hospital. With the development of modern technology, diseases of all joints in the body can be diagnosed and treated by arthroscopy. For knee diseases, most of them can be solved by arthroscopic surgery, except for joint replacement surgery. For example, common knee osteoarthritis, free body; synovitis, etc. In addition, for knee sports injuries, such as meniscus injury, anterior and posterior cruciate ligament injury, etc., it is even more advantageous to perform arthroscopic meniscal suture repair and ligament reconstruction, which can restore joint function faster and maximally.