Tetralogy of Fallot is the most common cyanotic congenital anomaly, which needs some operation for the survival. Perioperative mortality of the Tetralogy of Fallot was lowered remarkably in recent years, but some discussions were presented for the criteria of the corrective surgery and the corrective method of the pulmonary stenosis. In the Department of Thoracic and Cardiovascular Surgery of the Chunbug National University Hospital, 17 cases of tetralogy of Fallot were corrected totally from July in 1983 to August in 1984. In correction of the pulmonary stenosis, transannular patch was applied in B patients, infundibulectomy in 5, RVOT patch without transannular patch in 3, and isolated patches on RVOT and pulmonary trunk. Preoperative and early postoperative hemodynamic study revealed increased RA pressure in transannular patch group, which was significant statistically. [p<0.01]. Clinically, perioperative death occurred only in transannular patch group, and right heart failure signs including hepatomegaly, ascites, pleural effusion and peripheral edema were high in frequency in transannular patch group.