Abstract: Onthe basis of equivalent hypothesis, equivalent Mohr-Coulomb criterion bas been successfully applied to FEM software-Ansys by artificial conversion on jointed rock mass parameters, and all kinds of relation between the transformed parameters and original parameters are verified. At the same time, in allusion to rheological characteristics of jointed rock mass, by making use of theory of theological model with fractional order derivatives, a practical calculation method in which theological characteristics are taken in to account has been presentted, and rheological problem on rock solpe has been managed by changing material characteristics in the process of Ansys elasticity-plasticity analysis, it is shown by a example that this method is feasible.