Abstract: In order to research the stability of slope under seismic loading, finite element software Phase2 was employed to establish a numerical model of slope stability under most unfavorable load. The model was used to analyze the relationship between displacement and seismic loading-time at different monitoring positions under 0.1g peak value of horizontal acceleration as well as the variation of slope’s stress field, displacement field and shear strain increment. Result showed that influenced by horizontal seismic acceleration, the normal stress of slope decreased, and the sliding force increased and moved down along the sliding surface. The extreme displacement in the middle part of the slope reached 0.36mm, and slope failure occured when the seismic loading time reached 4s. With the increase of seismic loading time, the slope suffers accumulative damage. Instantaneous collapse and slide is most likely to happen under strong earthquakes.

Key words: soil slope, seismic loading, numerical simulation, stability analysis