Since the first report by Freeman of renal artery repair for renovascular hypertension in 1954, there has been a gradual improvement in the results of renovascular reconstruction. This is case report of renovascular hypertension due to diffuse primary arteritis, which was performed aorto-bilateral renal bypass graft with using of Y-woven dacron graft. This 33 y-o male has complained intermittent headache, facial edema & malignant hypertension symptoms for 1.5 years. He had the history of RL B-K amputation due to unhealed wound after trauma of the Rt. great toe about 7 years ago. The abdominal aortography revealed nearly not visualized the Rt. renal artery & severe narrowing of the Lt. renal artery. During postop. course, Blood pressure was well controlled. At postop. 3rd week, systolic pressure was down to 130-140mmHg But, diastolic pressure was remained to 100-110mmHg. At postop. 30th day, exploration was done due to intestinal obstruction signs. But severe ischemic enteritis was occurred due to fibrotic obstruction of the superior mesenteric artery. The next day, he was dead, In spite of Rt. common lilac artery--sup. mesenteric artery bypass graft. [KTCS 1981;2:175-178]