We reported a case of supravalvular pulmonary stenosis with atrial septal defect (ASD) in 37-year-old man. Extended pulmonary arterioplasty with the technique of Doty's operation for supravalvular aortic stenosis was carried out with bovine pericardial patch. Pressure gradient between the right ventricle and the pulmonary artery reduced from 90 to 20 mmHg after this operation. Doty's technique could be modified and successfully applicable to supravalvular pulmonary stenosis.