Abstract: <b<Purpose:</b< To evaluate the MSCT angiography 3D imaging in the diagnosis of cerebrovascular diseases. <b<Methods:</b< 20 patients with cerebrovascular disease were studied with CT angiography, using 3D reconstruction of cerebral vessels by post-processing working station to display anatomy of the disease. <b<Results:</b< Within 20 patients, aneurysm 10 cases, AVM 8 cases,cerebral vessels narrowing 2 cases(confirmed by DSA and operation). One aneurysm was confirmed by operation,not detected by DSA. <b<Conclusion:</b< CT angiography 3D reconstruction can omnidirectionally show cerebral vessels, it is a microtraumatic,safe and reliable methods and need less money,suitable for pre-operation planning, localization and follow up.