According to the structural characteristics of rock mass, optimization model of intaglio angle is summarized on high rocky slope, and the calculation method of optimum intaglio angle on high rocky slope is established based on the limit equilibrium method. This method has been applied in limestone mine of high slope governance practice in Fengshan Guangxi, for providing the basis of its intaglio Angle design. Through the qualitative and quantitative analysis of theStypesSof engineeringSrock massSand the rock mass structure on the influence of rock intaglio, and using the three-dimensional numerical simulation analysis the intaglio depth on the influence of stability of rock. In result, It gives this governance engineering theory of intaglio depth, It is 2m, determining the impact factors of intaglio Angle design, which are joint orientations, cohesive force, internal friction angle, the destructive rock mass of weight, slope angle and the depth of intaglio. Based on the principle of limit equilibrium, the limit equilibrium calculation model of rock intaglio mass is established, and the optimal intaglio angle is calculated, finally the optimal intaglio angle is 53.8°. At the same time, this instance is fully proved this calculation model as a simple effective and feasible means of calculating the optimal intaglio angle.