Objective: Terminal villi structure abnormalities could play an important role in preeclampsia (PE) and its complications development. Our aim was to perform comparative morphometric study of the placentas from mild and severe PE pregnancies. Method: Complex morphological and morphometric study of 9 term placentas from mild PE (mPE) cases (1st group), 6 term placentas from severe PE (sPE) cases (2nd group) and 10 term placentas from uncomplicated pregnancies (control group) was performed. Results: We revealed significant decreasing in terminal villi size in both preeclamptic groups in compare to control. This decreasing was much prominent in sPE group. We also observed significant terminal villi perimeter decreasing in both PE groups without any difference between mPE and sPE groups. Morphometry of CD31 stained specimens revealed significant decreasing in mean capillary number in both PE groups. Single capillary area and perimeter were significantly lower in mPE and sPE groups and these changes were much prominent in sPE group. Total villous capillary area and perimeter were significantly lower in both PE groups with minimal values in sPE group. Degree of villous capillarisation was significantly lower in both PE groups. Conclusion: Revealed features reflect villous structure changes in preplacental hypoxia, caused by mild and severe preeclampsia.