Truncus Arteriosus is an uncommon congenital anomaly which is now correctable surgically in patients with favorable anatomy. A case of a 9 month old male with truncus arteriosus, type II, is reported operation was done on cardiopulmonary bypass with deep hypothermia and circulatory arrest. The pulmonary arteries were not disconnected from the truncus, and the pulmonary common orifice was closed with a Dacron patch through anterior truncotomy and, for the distal anastomosis, the left pulmonary artery was opened near the common orifice. Continuity between the right ventricle and the left pulmonary artery was established with a valved conduit [Ionescu-Shiley, 14mm]. The postoperative course was excellent and uneventful. [KTCS 1983;1:30-33]