Objective To investigate cerebral hemodynamic changes in patients with unilateral stenosis of carotid artery by using CTP and CTA,and to analyze the dependability of the degree of artery stenosis and cerebral hemodynamic changes.Methods Fifty patients with unilateral stenosis of carotid artery underwent toshiba aquilion one CTP and CTA.The patients were divided into mod-erate stenosis group,severe stenosis group and occlusion group according to the NASCET criteria.The rCBF,rCBV,rMTT and rTTP were measured ,and compared between stenosis and contralateral hemispheres ,and the dependability were analyzed between the de-gree of unilateral carotid artery stenosis and relative perfusion parameters by using ranking-test.Results (1)There were 20 cases of unilateral carotid artery occlusion,13 severe stenosis,1 7 moderate stenosis.(2 )No statistical significance on rCBF and rCBV was found among the three stenotic groups (P>0.05).There were statistical significances on rMTT and rTTP among the three stenotic groups(P<0.05).(3)There were statistically no correlations between the values of rCBV,rCBF and the degree of artery stenosis.There were statistically positive correlations between the values of rMTT,rTTP and the degree of artery stenosis with the pearson correlations 0.512 and 0.708. Conclusion rMTT and rTTP are more sensitive parameters for evaluation of cerebral hemodynamics and dependability of carotid ar-tery stenosis on the CTP and CTA.These have an important value to guide the clinical treatment.