Abstract:Vague information always exists in mechanical parameters of rock mass in geotechnical engineering. The vague uncertain information of each physical variable is treated as fuzzy numbers in the control equation of finite element during the calculation. The calculated results of fuzzy finite element are also fuzzy numbers. Stability of the artificial high slope in the left bank of Xiangjiaba Hydropower Project is analyzed with the program based on fuzzy finite element method. Influence of fuzzy characteristics of mechanical parameters on the distribution of fuzzy stress and displacement is also studied. It shows that fuzzy characteristics of mechanical parameters in the artificial high slope in the left bank of Xiangjiaba Hydropower Project results in great extent variation of tensile stress area. It is suggested that the influence of variation of tensile stress area on the slope reinforced extent should be considered in the design for the reduction of engineering risk.