Abstract: Purpose: To investigate the CTA examinational value of the vascular lesions caused by ischemic cerebrovascular disease. Methods: Use Philips Brilliance's 16-slices helical CT, Philips Extended Brilliance TM Workspace or GE AW4.4 Image post-processing workstations, mainly by MIP and CPR, supplied by VR, to do some analysis of neck and cranial artery, then observe the morphologic changes of the vascular lesions in ischemic cerebrovascular disease. Results: 90 of the 102 ischemic cerebrovascular diseases have been found vascular lesions(88.24%), in the 90 vascular lesions, there were 57 pure cerebral artery diseases(63.33%), 12 pure carotid artery stenosis and plaques(13.33%), 21 combined lesions of cerebral arteries and carotid arteries(23.33%). The CTA performance of vascular lesions: from the 78 detected cases of cerebral artery disease, 24 were showed of atherosclerotic changes, 38 were showed of clearer limited hemal stricture, 6 cases of which could be seen patches, 16 were showed of vascular occlusion, all happened in the middle cerebral artery. In the 33 detected cases of carotid artery disease, those were showed of hemal stricture, plaque formation and hemal wall calcification, all located in the carotid arterial bifurcation and the initial part of internal carotid artery. The relationship of varieties of the ischemic cerebrovascular diseases and the vascular lesions: 48 cases of cerebral infarction, 29 have been found responsible vessels; 26 TIA, 22 have been found vascular; 19 cases of lacunar cerebral infarction,16 of which could see different levels of carotid artery and cerebral artery diseases. 9 cases had clinical manifestations but were found normal through CT and(or) MRI, 6 showed of cerebral and carotid artery diseases. Conclusion: CTA can be the routine examination method of ischemic cerebrovascular diseases, so as to evaluate the morphologic changes of the vascular lesions in ischemic cerebrovascular diseases.