Abstarct: Related to rock engineering projects need to be aware of the mechanical properties of the rock mass. Different direct and indirect methods are presented to better understand the mechanical characteristics of jointed rock mass. Using the most reliable method for estimating in situ methods rock deformability, but these methods require more time and cost allocation. Analytical and numerical methods can be used. Discrete element method with consideration of the true nature of the fracture system is superior analytical methods. In this thesis, compliance matrix for fractured rock mass calculated using 3-D Discrete Element Method. At first, after removal of discontinuities with the scan line method of coal mine Tazareh, using software Dips joints were determined. The mechanical properties of rock material was determined by conducting laboratory studies. Next, the geometric properties of harvested and processed for statistical probability distribution functions of the geometric characteristics were determined. The following geometric properties and geomechanical properties of the rock mass discontinuities 3DEC entered in the software. The Representative Elementry Volome of the rock mass was determined and Min proposed using the instructions during the loading of three-dimensional numerical simulation of jointed rock mass compliance matrix determined Tazareh mine. Some components of empirical equations were compared with the result.