Objective To evaluate the features of CT perfusion for vertebrobasilar dolichoectasia (VBD). Methods The image data of 13 cases with VBD as observation group and 22 cases of normal controls were retrospectively analyzed from February 2011 to March 2012. 3 regions of interest (ROI) in white matter of cerebellum, cerebellar peduncle and pons were drown symmetry to measure the parameters including cerebral blood flow (CBF), cerebral blood volume (CBV), mean transit time (MTT) and time to peak (TTP). The diameter of basilar artery and the age of the observation group were also measured. Results There was significant difference between 2 groups in TTP in all ROI (P<0.05), and no significant difference in CBF, CBV and MTT in all ROIs (P>0.05). The age, the diameter of basilar artery did not correlated with perfusion parameters (P>0.05) in the observation group. Conclusion CT perfusion imaging can demonstrate some features of posterior circulation as auxiliary diagnosis of VBD.