It is difficult for conventional computed tomography（computed tomography，CT） to assess vascular disease caused by head and carotid artery stenosis，occlusion，etc.，failing to show vascular variation，malformation，narrow degree，collateral circulation and plaque characteristics. Computed tomography angiography（CT angiography，CTA） is a non-invasive imaging technology for rapid e－valuation of the head and neck vascular system. This paper first summarizes the correlation between CTA and anatomy and segmenta－tion basis of head and neck vessels. Then，based on the advantage of CTA in screening the anatomy and morphology of the head and neck vascular system，the application referring to the diagnosis of common cerebrovascular diseases，the progress of new technologies and the corresponding advantages and limitations has been reviewed. Finally，the future development direction of CTA is prospected.