Synovitis in children between the ages of 3 and 6 years old is a disease that occurs mainly in the knee joint and is characterized by a rapid onset, with no obvious symptoms in the early stages of the disease. Synovitis can be triggered by trauma, such as impact and friction, or by the accumulation of inflammation in the body caused by a cold. Synovitis in children is not self-healing, the main reason is the severity of the disease, synovitis is also a type of arthritis, the causes vary, the knee joint lesions have to be treated reasonably, in order to quickly control the disease, so when children are found synovitis should be treated as soon as possible to recover. There are various ways to treat synovitis in children, depending on whether the patient is acute or chronic. In acute attacks, it is best to use medication with Chinese medicine, which is the most effective treatment, mainly through acupuncture and moxibustion, to control the main purpose of inflammation development. In chronic cases, when there is a lot of fluid in the joints, active fluid extraction can be very effective in relieving the symptoms quickly and preventing the joint function from being affected. Patients can also use conventional nursing treatment. Nursing treatment is for people with mild disease or chronic attacks, and children are too young for physical therapy or Chinese ointment treatment, and treatment should match the emotions of children.