Six hundred and twenty two cases of open heart surgery were performed at Sejong General Hospital in 1986. And also, 117 cases of non open heart cardiac surgery had been performed during same period. Among the 622 open heart cases, 548 were congenital cardiac diseases and 74 were acquired heart diseases. In congenital heart patients, 422 were acyanotic and 126 were cyanotic. There were 52 cases of infant open heart Surgery below 12 months. Acyanotic group were consisted of 314 VSD, 66 ASD, 13 AVSD, 9 PDA, 8 ASD + PS, 4 AS, and 8 other rare cardiac cases. And cyanotic group were consisted of 84 TOF, 15 DORV, 5 Trilogy, 4 Ebstein`s anomaly, 3 PS + TR, 3 TGA, 3 TAPVR, 3 Pulmonary atresia and 6 other rare cardiac diseases. Majority of the acquired heart cases were valvular heart diseases. And there were also 4 cardiac myxoma and one endomyocardial fibrosis in acquired heart disease group. The operative results were as follows: Overall operative mortality, 5.3%: acyanotic 2.4%: cyanotic 15.8% and acquired heart disease, 8.5%.