Analysis of benchmark height changes along national 1st order precise levelling lines crossing the Middle Odra Fault Zone in the Wroclaw area has been presented in this paper. The zone separates Fore-Sudetic Block from the Fore-Sudetic Monocline and is one of the main geological structures in Lower Silesia. Five national precise levelling lines cross the research area: Ząbkowice Śląskie - Wrocław, Syców - Wrocław, Karczów - Wrocław, Kawice - Wrocław oraz Krotoszyn - Wrocław. These levelling lines were measured in 1956-58, 1975-80 and 1999. Changes of benchmark heights have been presented in comparison with geological cross-sections made along the levelling lines. In the result, areas of the greatest relative vertical displacements correlated with geology and tectonics have been found., Piotr Grzempowski, Janusz Badura, Stefan Cacoń and Bogusław Przybylski., and Obsahuje bibliografii