Objective To evaluate the normal flow velocity measurements of Basilar Artery (BA) utilizing phase contrast magnetic resonance imaging(PCMRI), and explore the influences of different Velocity encoding(Venc) on the PCMR flow measurements of BA. Methods 36 healthy volunteers were recruited for research. For every volunteer, the localizer was placed perpendicular to ampulla region of the BA on TOF-MRA image with the Venc of 40, 80, 120, 160, 200 cm/s. The region of interest was drew in the PCA/M amplitude image when the BA could be seen optimally. The evaluated parameters were the peak velocity (PV), mean velocity (MV), and the mean flow (MF). Using SPSS17.0 statistical analysis, P<0.05 was considered statistically significant. Results When Venc was set 40cm/s, all phase images appeared phase confusion. When Venc was set 80~200cm/s, all parameters did not show any statistical difference(FPV=0.46, FMV=0.07, FMF=0.17, P>0.05). When Venc was set 40~200cm/s and 80~200cm/ s, all parameters showed prominent statistical difference(FPV =37.22, FMV=57.92, FMV=34.72, FPV=11.81, FMV=7.23, FMF=9.01, P<0.01). Conclusion The feasible Venc district was 80~160cm/s.