Abstract: The soil-rock mixture slope is a common type of slope. Its medium distribution and strength characteristics show extremely dispersed which are greatly affected by the stone content which brings certain difficulties to modeling and analysis. In order to solve the above problems,while further exploring the stability and failure mode of the soilrock mixture slope,we attempt to use FLAC^3D numerical simulation software to establish a slope with typical dimensions,and then arrange the stone elements in the model randomly. Further,we use the built-in strength reduction method to analyze the stability of the slope. The results show that the increase of the stone content will significantly change the displacement field,the vertical stress field and the distribution characteristics of the shear zone. Among them,the contours of total displacement are obviously jagged; and the contours of vertical stress show extremely uneven and there is a phenomenon of local stress concentration; the shear zone shows irregular with surrounding rocks,and when the stone content is 40% to 60%,the above characteristics are the most significant; the factor of safety increases in varying degrees with the increase of the stone content,which mainly depends on the stability of the structure.