In a series of 20 consecutive patients from 1970 through 1988, aortic arch aneurysms were treated with the aid of selective brain perfusion. In our institute, cerebral perfusion was carried out with individual roller pumps, when the femoral artery was used for body perfusion and the innominate (INA) or right axillary artery (RAX) and left common carotid artery (LCA) were used for brain perfusion. The flow rate was 6.4±0.6ml/kg/min to the INA, 7.4±1.7 to the RAX and 5.7±1.5 to the LCA. The operative deaths were accounted in 5 cases (25%), the post operative cerebral complication was observed in 1 case (5.9%). At present we prefer to make a purse-string suture and insert the cannulas to the INA or LCA without clamping these arteries. Currently we carried out the separated brain perfusion under moderate hypothermia (26∼28°C) with indivisual roller pumps, when we maintained the flow rate to the INA or RAX constant at 7ml/kg/min, the LCA at 5.