Arthroscopy has the advantages of fine surgery, small incision, less trauma, less pain, faster recovery and shorter hospital stay, which reflects the guiding ideology of “people-oriented” and is one of the development directions of medicine in the 21st century, as well as the objective requirements of people’s health care awareness and social civilization progress. 1, anterior and posterior cruciate ligament injury repair (1) for the cross ligament laxity with plasma radiofrequency knife tightening; (2) for the cross ligament rupture can choose different materials for repair: autograft, allograft, artificial tendon. (2) Treatment of meniscus injury: The most common lesion in knee trauma, different procedures such as suture repair, partial resection, or disc meniscus molding can be performed according to the specific condition of the injury; (3) Treatment of intra-articular bone and articular cartilage injury. Arthroscopic radiofrequency repair or drilling and other different procedures; intra-articular fractures can be repositioned and fixed under the microscope 4, intra-articular synovectomy synovectomy has become the standard surgical method for the treatment of synovitis, suitable for all types of hypertrophic synovitis: ① such as rheumatoid arthritis, pigmented villous nodular synovitis, synovial chondromatosis, rheumatoid variant types and chronic non-specific synovitis; ② secondary synovitis: such as crystal synovitis caused by gout; ③ infection of the joint: such as synovial tuberculosis, septic arthritis; ④ synovectomy for osteoarthritis is part of joint cleanup. Arthroscopic synovectomy has more advantages and fewer complications than the traditional surgical method of cutting the joint, mainly in the following aspects: ① more complete synovectomy; ② no damage to the meniscus and anterior fork ligament; ③ no influence on the biomechanical mechanism of the quadriceps muscle; ④ tiny skin incision; ⑤ fast postoperative recovery and fewer complications. Shoulder joint disease and injury diagnosis and treatment Frozen shoulder, rotator cuff injury repair, joint capsule and SLAP injury can be manifested as intractable shoulder pain and activity restriction, shoulder arthroscopy minimally invasive technology can clarify the cause, deal with the corresponding lesions, and quickly improve the symptoms 6. Repair. 2. excision of diseased synovial tissue. 3. treatment of hyperplastic bone. 4. removal of free body. 5. tibial high osteotomy combined with microscopic surgery for internal derangement of the knee and early and mid-stage osteoarthritis: not only can the intra-articular lesions be investigated and treated, but also the force line of the affected knee can be corrected to improve the symptoms and prolong the service life of the joint. Pre-operative joint free body Intraoperative removal of free body 7, diagnosis and treatment of patellar chondromalacia and patellar instability. 8.Diagnosis and treatment of joint adhesions. 9.Hip arthroscopic diagnosis and treatment of complex hip diseases such as hip free body removal, synovectomy, etc. 10.Ankle arthroscopic diagnosis and treatment: suitable for the diagnosis and treatment of ankle osteoarthritis, rheumatoid arthritis and post-injury arthralgia.