Three cases of tricuspid atresia were treated by Fontan varieties of operation in this department in 1980. The first case was 19 year old girl who underwent Glenn operation at the age of 6 years. Her second operation was done with ASD closure and 16mm Ionescu-Shiley valved conduit insertion between right atrium and main pulmonary artery. The second case was a 5 year old boy who underwent Kreutzer operation successfully utilizing 14mm Ionescu-Shiley va]ved conduit. The above mentioned 2 cases were Type Ib after Keith`s classification, whose immediate postoperative courses were complicated by pleura] effusion [in 2nd case chylothorax] hepatomegaly, and ascites. Those complications were relieved completely by medical treatment and closed thoractomy; Postoperative follow-up up to 11 months and 1 year periods were satisfactory with disappearance of cyanosis and dyspnea. The third case was a 8 year old boy who had complete TGA with TA [Keith`s Type IIb] who underwent Kreutze`s operation utilizing 14mm Ionescu-Shiley valved conduit, he died of low cardiac output Immediately after open heart surgery. [KTCS 1981:1;26-32]