Synovitis forming joint effusion can be treated by the following methods: first, joint braking to reduce activities and avoid adverse stimuli such as cold and moisture; second, microwave therapy, ultra-short wave therapy, far-infrared therapy and herbal iontophoresis therapy to the joint can promote synovial blood circulation, reduce synovial inflammatory reaction, facilitate the reabsorption of joint effusion by the synovial membrane and reduce joint swelling; third. Oral administration of non-steroidal anti-inflammatory drugs, such as loxoprofen sodium, celecoxib, indomethacin and ibuprofen extended-release capsules, can quickly eliminate synovial inflammation and reduce joint effusion; fourth, if joint effusion is not easily eliminated, and the amount of effusion is too much and the patient has obvious swelling and pain, joint puncture is feasible to extract joint effusion and joint compression bandage. In elderly patients, joint closure injection therapy is feasible, which can quickly relieve joint inflammation and reduce the effusion; fifth, if conservative treatment is ineffective, arthroscopic surgery is required to remove the inflamed synovium.