Abstract: The heterogeneity of rock has an important influence on the fracture form and mode of rock.In this paper, based on the Mohr-Coulomb criterion, the stress-damage model of heterogeneous rock is established.Through FISH language, the elastic modulus, cohesion and internal friction angle of heterogeneous rock are weakened with plastic strain.In this paper, the fracture characteristics of rock under different homogeneity and the methods of describing the state of different elements are discussed, and the correctness of the model is verified by the previous experimental data.The main conclusions are as follows:with the increase of homogeneity, the fracture mode of rock changes from plasticity to elastic brittleness; the relationship between uniaxial compressive strength and homogeneity is logarithmic function; the fracture characteristics of rock can be described by plastic zone, unit failure proximity and damage value, and the failure proximity has strong superiority.