Abstract: Objective: To explore the morphological characteristic of cerebral parietooccipital sulcus on series axial MR imaging of brain.Methods: On MRI of 30 normal volunteers' brain,parietooccipital sulcus was observed by the method of continuous tracking and three dimensional cursor on eFilm 2.1 workstation.The parietooccipital sulcus was identified and observated,and the morphological characteristic was analyzed on series sections.Results: The parietooccipital sulcus showed shaped-"一","U" and "Y" on cross-sectional MR imaging(Z=-6-36mm).The sulcus appeared "一"-shaped most commonly(87.3%) on 622 sections,and the others appeared U-shaped and Y-shaped(12.7%).Conclusions: The parietooccipital sulcus is identified accurately,and the cuneus and precuneus can be localized easily depend on the results.