In order to optimum exploitation of country water resource and energy production, utilize of Clas river water resource in the west Azarbaejan province, Sardasht city via make dam on that river was anticipated. The goal of the project accomplishment in the first point, is electricity energy production and agriculture and etc set in next preference. Main purpose of this thesis, is stability analysis and conveyance tunnel to powerhouse support system design with consider anisotropy condition, that tunnel cross slate rocks, and also inner hydrostatic pressure. For stability analysis empirical and numerical method have utilized. Wiht rock mass justify; MARGIN: 0cm 0cm 0pt; unicode-bidi: embed; DIRECTION: ltr" With attention to result of rock engineering justify; MARGIN: 0cm 0cm 0pt; unicode-bidi: embed; DIRECTION: ltr"