Objective To observe and measure the basilar artery EM>in vivo/EM> by 3.0 T magnetic resonance angiography(MRA). Method A total of 108 subjects experienced MRA and conventional MRI examination, the sex ratio was 58 male to 50 female, and the age ranged from 4 to 63 years ［mean (39.86±14.57) years］. Observing and recording the intracranial vertebrobasilar artery morphological type, measuring the length and lumen diameter of the basilar artery. Statistical testing was performed. Results The common types of basilar artery followed by typeⅠⅠ, typeⅡRⅢ, typeⅡRⅠor typeⅡLⅠ. The average straight line length of the basilar artery was (2.35 ± 0.30)cm. The straight line length of the basilar artery in men was longer than that in women (EM>t/EM>=4.19,EM> P/EM><0.000 1). Straight line length of the basilar artery was correlated with age (P <0.05, r=0.28). The number of the bending basilar artery was 51, in addition to 1 case of bilateral bending, the others were unilateral. The average diameter of the basilar artery was (0.26 ± 0.05)cm. there was no difference between the diameter of upper, middle and lower segment of basilar artery (EM>χ/EM>SUP>2/SUP> = 3.13, EM>P/EM>>0.05). The average diameter of th