Abstract：Based on 3D nonlinear FEM analysis of Jinping high slope，the rigid limit equilibrium method in the stability analysis of high slope is discussed. The first stage hydropower station of Jinping locates between in Yanyuan county and Muli county in Sichuan province. It is an important cascade hydropower station in Yalong River. The high slopes of both left and right banks of Jinping Hydropower Station are on large scales，and the geology is complicated too. The excavated slopes of this project include the excavated slope of spandrel groove and cable machine platform. The concept and method of multiply mesh are put forward，and the stress result of FEM is tranferred to any sliding surface(plane or surface). In this way，the stability state of sliding surfaces can be analyzed. The stress distribution on sliding surfaces of sliding blocks is computed，including the safety factor of the sliding surfaces and blocks at each load step，yield area，normal strength and shear strength of sliding surfaces during overloading. Based on the results，the process of sliding blocks' failure due to deformation is discussed systemically. This findings can provide a more profound cognition on limit equilibrium analysis for stability analysis of high slope in practical engineering.
