Among 51 patients with LCOS, 58.82% patients had polycythemia, 33.33% had thrombocytopenia, overriding of the aorta 50% was 86.27%, cardiopulmonary bypass (CPB) time3 160 minutes was 27.45%, 92.2% patients was enlarged pulmonary artery with pericardial, 41.18% patients had monocusp and 37.25% had transannular patch.