(1) Asymptomatic but ECG shows right ventricular hypertrophy or with strain, and X-ray shows moderate enlargement of the heart. (2) Although the patient is asymptomatic and there is no obvious abnormal change in the ECG, the right heart catheterization shows that the right ventricular systolic pressure is above 8.0 kPa (60 mmHg), or the transvalvular pressure step difference is greater than 5.3 kPa (40 mmHg), or the echocardiography shows that the valve orifice is 1.0-1.5 cm, which is moderate stenosis, and surgery should be considered. (3) If there are symptoms, abnormal changes in ECG and X-ray, the surgery should be performed at the age of preschool. (4) In cases of extreme stenosis with a history of syncope, surgery should be performed in infancy to reduce the right ventricular load. (5) At present, the main surgical methods are: balloon dilatation (characteristics: minimally invasive, less damage, but easy to treat incompletely, sometimes need multiple treatments); direct vision surgery (pulmonary valve junctional dissection, complete treatment, but more damage than balloon dilatation).