The cement plaster material is a new type of material of simulated rock, not only retains thecement's good mobility advantage, but also substantially improves the compressive strength and shearstrength of the mortar, and the failure mode is very similar to the actual rock, obviously which is a i-deal similar simulation material.In this paper, we use this cement plaster material to simulate the sin-gle-jointed rock, and then analyze the three-dimensional rock models with different obliquities jointto discuses the compressive strength variation by FEM.The study confirmed the reliability of the ce-ment plaster material, which laid the foundation for further development of the size effect and the frac-tal jointed rock mechanical properties.