Abstract: This paper intend as to inquire into spiral CT angiogram (SCTA) and the new technology of 3D reconstruction. in the use of cerebrovascular diseases. We examined 26 cases of cerebrovascular. Diseases by CTA and 3D reconstruction. 3D reconstruction uses Maximum Intensity Projection (MIP) or surface Rendering. There was 13 cases of intracranial aneurysm, 6 cases of cerebrovascular Malformation, 5 cases of spontaneous intracranial hemorrhage and 2 cases of cerebral ischemia, This group contained 23 cases by DSA and was contrasted with the ones by CTA. The result of 22 cases by CTA was the same as the ones by DSA except that 3 cases weren't used DSA and 1 cases of multiple aneurysm wasn't found 2 little aneurysm by CTA. CTA is superior to DSA in describing the bone structure and the cerebrovascular 3D structure. SCTA is a simple, quick, valuable cerebrovascular photography with no wound. It can replace DSA or wounded angiogram of the head.