Two young male patients were operated on for the Marfan syndrome complicating ascending aortic aneurysm and a moderate degree of aortic regurgitation. We replaced the ascending aorta and aortic valve with Bjork-Shiley aortic valve composite graft and implanted the coronary ostia in the sides of the graft directly. Postoperatively, the atrial fibrillation occurred in one case and the other had uneventful course. They showed improvement in activity at follow-up.