Abstract：After systematically analyzing the engineering geological conditions of the high slopes at both the outlets and inlets of the two tunnels of the Panshitou Reservoir，Henan province，a classification of the engineering geological rock groups of the high slopes is made，then the slope failure models are proposed. The rockmass mechanics parameters of the slopes are also discussed. Based on these，stereographic projection method，limit equilibrium method and three-dimensional differential method (FLAC3D 2.00 for Windows) are used for stability evaluation of the slopes.
