CT scans were analysed retrospectively in 130 patients with subarachnoid hemorrhage(SAH) due to ruptured cerebral aneurysm to evaluate the relationship of the locations of aneurysms and the patterns of hemmrrhage. Hemorrhage corresponded to the site of aneurysmal origin in a general way and in more specific ways to anterior communicating and middle cerebral artery aneurysms when there was parenchymal or cisterinal hemorrhage. In anterior communicating artery aneurysm, SAH in the interhemispheric fissure, both sylvian fissures, and basalcistern was usually noted and intracerebral hemorrhage in anteroinferior frontal lobe was sometimes associated. Incases of middle cerebral artery aneurysm, hemorrhage in the ipsilateral sylvian fissure, interhemispheric fissure, and ipsilateral basal cistern was usual. Intracerebral hemorrhage in lateral temporal lobe was sometimes associated. Posterior communicating artery aneurysm demostrated SAH in the ipsilateral basal cistern of in entirecisternal spaces specifically, so with higher incidence of involvement of the quadrigeminal and superiorcerebellar cistern than anterior cerebral or middle cerebral artery aneurysm. We suggest the locations of aneurysm might be predicted with patterns of SAH and /or associated intracerebral hemorrhage with CT.