Abstract: Earthquake is an important factor in triggering landslides,the Wenchuan earthquake caused many landslides hazards in Longmenshan region.Affected by strong earthquake,many deposits which are stable in natural conditions become unstable.On the basis of geological investigation to deposits landslide in the region,clarify the deformation mechanism of the landslide by the effect of earthquake.Adopted finite element simulated its stability state under earthquake,analysis the dynamic response feature under earthquake.Also we studied the features of instable probability of accumulation deposits landslide under earthquake.It is comprehensive that the landslide is less stable in the earthquake effect and thus evaluated the stability of the landslide reasonable.