Abstract: The influence of rainfall infiltration on stability and deformation of sandy slope are studied based on the numerical simulation model.The results show that with the increase of rainfall duration and intensity，slope safety factor tends to decrease.The safety factor decreases with the slope angle and height increase，while it increases with the increase of internal friction angle and cohesion.The height and angle of slope have less effect on the depth of slope sliding，and the slope with large internal friction angle are more likely to happen the shallow slide，while the slope with high cohesion are more likely to happen deep landslide.With the increase of rainfall duration，horizontal displacement at the foot of the slope appears sudden change，and this position is most likely to produce shear sliding.The greater of the shear bearing capacity of the slope，the greater of the safety factor is.However，anti-slide pile with large bearing capacity will deepen the critical slip surface.Safety coefficient of the slope reinforced by anti-slide pile at the bottom of the slope increased by 2%~5% than that at the top of the slope.Thus，the reasonable design strength of the anti-slide pile could increase the slope safety factor without changing the dangerous slip crack surface.

Key words: Sandy slope, Rainfall infiltration, Stability, Deformation, Anti-slide pile