Synovitis of the knee joint, is a multifaceted disease. It tends to cause temporary or long-term partial loss of labor and is harmful to both patients. At present, many patients still cannot be cured despite many effective treatment methods. Some young and middle-aged patients, in particular, have to bear many social and family responsibilities while suffering from long-term pain. The knee joint is the joint with the most synovial membranes, the largest joint surface and the most complex structure. Because the synovial membrane of the knee is extensive and located in the superficial part of the limb, it has more chances to suffer from injury and infection. Such as meniscal injury, synovial injury, cruciate or collateral ligament injury, intra-articular injury and dislocation, knee osteoarthritis secondary to chronic synovitis of the knee and joint free bodies. Another cause is infection, of which synovial tuberculosis is common. Generally speaking, the synovial membrane is rich in blood vessels, has good blood circulation and is resistant to bacteria, but in the case of infection with tuberculosis bacteria, the disease progresses more slowly and its symptoms are sometimes good and bad, this is one of the chronic synovitis of the knee joint. After synovial injury, the synovial membrane of the knee joint shows congestion, edema and neutrophil infiltration. Synovial vasodilatation, plasma and cellular extravasation, and large amounts of exudate are produced, while synovial cells are active and produce large amounts of mucin. The exudate contains red blood cells, white blood cells, bilirubin, fat, mucin, and fibrin. In severe cases, the joint effusion is bloody in nature. The joints are swollen and movement is limited. If left untreated, synovial hypertrophy, intra-articular adhesions and cartilage degeneration may occur in the late stage. If the injury is repeated, the synovial reaction may become chronic and manifest as lymphocytic and plasma cell infiltration. All of these phenomena are non-specific synovial reactions. In severe injuries that result in synovial defects, healing is rapid because synovial cells can regenerate and proliferate, while other tissues and cells can be biochemically transformed into synovial cells. However, in severe proliferative knee osteoarthritis, synovial villus edema, hypertrophy, thickening, formation of many synovial folds of different sizes and shapes, fibrous proliferation of subsynovial connective tissue groups, and aging of synovial tissue biology significantly reduce the ability of synovial tissue to regenerate and repair. Synovitis is an aseptic inflammatory disease caused by poor microcirculation, and the main symptom is fluid production. The synovial membrane is a layer of membranous tissue surrounding the joint, which not only protects the joint, but also produces joint fluid, providing “lubrication” for joint movement. The production and absorption of joint fluid is a “dynamic balance”. When the reabsorption of joint fluid is impaired, the dynamic balance between the production and absorption of joint fluid is broken, and the production of joint fluid is greater than the reabsorption, then “joint effusion” will occur. The main treatment for synovitis is to regulate the microcirculatory system, as long as the microcirculation is smooth, the fluid will disappear, and the inflammation will also be lifted, try not to strain during the period of fluid, reduce the frequency of pumping injections, too much pumping injections will stimulate the subsynovial connective tissue group fiber proliferation, as well as synovial tissue aging, so that synovial tissue regeneration and repair capacity is significantly reduced, and then the treatment will be more trouble.