The rupture of the aorta commonly follows major blunt truma to the thorax. It was markdly increased in recent years, paralleling the rising number of vehicular accidents, The patient underwent surgical repair with femoro-femoral partial bypass 40 days after injury. The anesthesia for descending aortic surgery presented problems involving large hemodynamic alterations during thoracic aortic cross-clamping, protection of the heart and brain from large increases in pressure occuring above the cross clamp, and prevention of spinal cord and renal ischemic damage below the cross-clamp. One lung ventilation was also employed with this anesthetic technique. A 23 years old male patient with traumatic aneurysm of descending thoracic aorta was treated successfully.