Abstract: The landslide of San'guanmiao in Gongchangling District of Liaoyang city lies in the zone of Ⅶ degree earthquake intensity，and slides on both sides.Although the slope of the landslide is gentle，with the lubricating effect of the polluted water within the sewage canal，the landslide is currently in the creep deformation stage.The finite element simulation model was established by Midas-GTS to calculate and stability of Sanguanmiao landslide under the condition of natural condition and seismic condition.Considering the seismic probability exceeding by 10% in 50 years，the grid topology is made by adopting the quadrilateral circular grid method with the peak of time history load 0.1 g to make the strength reduction on the physical parameters of rock mass.Through analyzing the slope shear strain and equivalent analysis of plastic zone，the potential sliding zone is determined.Compared with the result by limit equilibrium method，it is found that both fit very well.The calculating results show that the slope basically keeps stable in the natural state，with the safety coefficient varying from 1.2 to 1.3.But with the participation of the acceleration of 0.1g for dynamic peak of earthquake，the slope become in an unstable state with the safety coefficient of 1 or lower.

Key words: Landslide, Earthquake, Numerical simulation, Midas-GTS