Incontrovertibly, the grouting operation on issues of construction is undeniable. For a comprehensive understanding of how the impact of these operation on consolidation of the rock mass direct and indirect methods have been proposed, one of the indirect methods used to study the behavior of the rock mass, is numerical methods. Among the variety of numerical methods, Discrete Element Method-Discrete Fracture Network enjoys a number of advantages. As a result the DEM-DFN came up with some measures like combination of actual data of joint properties and intact rocks, surveyed the nature rock mass and constitive models of each sections of rock mass try to approch the simulation to the real behavior of the rock mass in nature ,to a large extent. Using the probability distribution function of joint properties and Monte-Carlo simulation method the fracture network produced in three-dimensional media, subsequently two-dimensional fracture networks for particular geographic directions of three-dimensional fracture network were extracted. Afterwards to determine the deformation behavior of the ungrouted and grouted with water to cement ratio of 1:1 and 1:1 rock mass for three proportion of joint normal stiffness to normal by 2.0, 2.5 and 3 by means of complince tensor, static and dynamic loadings were conducted, eventually results in the size of the blocks by representative elementory valoumes (REVs) of the mechanical properties were compared before and after grouting performance. It was found that, the deformability modulus of the rock mass could be increased by grouting, and also it caused to diminishe the nature anisotropy of the rock mass. The strength of the masse as another mechanical behavior of the rock mass is either ungrouted or grouted rock masse states was investigated. Inwhich three-dimensional media, gouting generally increases the strength of the rock mass, but for the two dimensional space it exhibited ambivalent attitudes against the different composition of grout slurry. After determining the representative of the uniaxial copressive strength of the rock mass, in such different ways lateral stress were applied on rock mass, consequently the failure criterias were determined for two-dimensional and three-dimensional media. Finally, reviewing the rock mass failure in the case of constant velocity load, was found that grouting of rock mass, despite joints as weak regions in the rock mass failure in this case the continuum rock rocks (intact rock) could be occured.