At present,the dynamic analysis of slope mainly focuses on soil slope or rock slope,but ignores soil-rock mixture slope which is a special geomaterial slope. However,few studies have simplified the soil-rock mixture slope into equivalent homogeneous soil slope,ignoring the existence of block rock. By using digital image processing technology,a meso-structure model of an actual soilrock mixture slope is established,and the deformation and stability of equivalent homogeneous soil slope and soil-mixture slope under seismic load are analyzed and compared by using the dynamic analysis module of FLAC3D software. The following conclusions are drawn:the soil-rock mixture slope first appears shear failure at the foot of the slope under earthquake;then gradually develops tensile failure at the top with the increase of action time;finally forms a complete failure zone. The sliding surface of the soil-rock mixture slope is restricted by the position of the rock and has the phenomenon called stone-winding phenomenon. Under the same seismic load,the failure zone of soil-rock mixture slope is slower than that of the equivalent soil slope,and the final permanent displacement is smaller than that of the equivalent soil slope. The existence of block stones increases the shear strength and stability of soil-rock mixture slope.