Tricuspid atresia is the third most common cause of cyanotic heart disease, following T.O.F. and T.G.A. It is seen in about 30% of patients with congenital heart disease on postmortem examination. Recently, we experienced a case of tricuspid atresia, who had received Blalock-Taussig Shunt operation 10 years ago. The Patient was 15 year-old girl with the complaints of persistent cyanosis and exertional dyspnea. Cineangiography revealed Keith type lib tricuspid atresia, so, RA appendage was anastomosed to the right pulmonary artery and ASD was also closed using patch. Postoperative course was very difficult because of persistent right heart failure and weak respiratory power, but from postoperative 15th day, all cardiac and respiratory problems were resolved. We followed up this patient for about 1 year, and her condition is excellent up to now.