On the basis of cerebral angiographic findings, 112 cases of intracranial aneurysm were analysed. In most of them, cerebral angiographies were done due to suggestion of Suharachiod hemorrhage. clinically and in some, due to suspicion of cerebral tumor or head trauma. 1. The sex and age distribution of 112 cases of intracranial aneurysms were as follows; The incidence of male was 44.6% and that of female 55.4%. The peak frequency(17.9%) in the male was 40 to 49 years un that(17.0%) in the female 50 to 59 yrs. 2. The incidence of multiple aneurysm was 10.8%. 3 The locations of intracranial aneurysms were as follows: Ant. comm. art. account for 34.8% the regions of post. comm. art. for 23.5%, the main branching region of middle cerebral art. for 17.4% and the bifnrcating region of int. carotid art. for 7.8%. 4. The shape of intracranial aneurysms were most frequent in saccular shape(77.0%), next in dumb-bell shape(17.7%) and in fusiform(5.3%). The saccular shapes were relatively requent in the aneurysms of post. comm. art. 5. The relationship of the size of intracranial aneurysm and age or blood pressure were that relatively big sized aneurysms(7-10mm) were frequent after the age of 30 yrs. old and in the patients with high blood pressure, 6. The vascular spasms in the ruptured or symtomatic intracranial aneurysms were almost seen on the same side of the aneurysms, and occure in about 20% at the site of proximal or distal to the aneurysms locally or entire main and peripheral branches on the same side of the lesions diffusely without great difference in the two groups, however diffuse spasm distal to the aneurysms occured in the incidence of 19.7% of rupture cases and of 3.0% in only symtomatic cases. 7. The early filling of meningeal artery of poor filling of peripheral branches which were suggestive of increased ICP were somewhat moreprominent in the ruptured aneurysms than in the symtomatic aneurysms. 8. The changes of cerebral angiographic findings by ce ebral hemorrhage, cerebral edema and the formation of hematoma were as follows: Ant. cerebral art. shifting accounts for 24.6%, middle cerebral art. shifting for 16.4%, dye leakage for 11.5%, Lenticulostriate art. shifting for 9.8%, venous angledistortion of shifting for 3.3%, abnormal vascular staining for 1.6% and avascular area for 1.6%.