A small amount of knee effusion usually requires only strictly conservative treatment to make the joint effusion subside. In the acute stage, it is best to rest in bed without weight bearing on the knee joint and to be treated with microwave physiotherapy and blood-stasis activating drugs. If the joint effusion is not absorbed, you can try to extract it with a syringe, but the effect of extracting a small amount of effusion is not too good, and there is no way to completely extract the joint effusion, so most of the treatment is done systematically by applying drugs to a small amount of joint effusion. After treatment, it is important to avoid the causes of joint effusion, such as synovitis of the knee joint, which requires treatment for synovitis. For example, if the knee has synovitis, treatment should be given for synovitis. If the knee has meniscus damage, further treatment should be given for meniscus damage.