Abstract: In this paper, the Sarma non vertical slice method and non linear finite element method are used to analyze the slope stability in Xiaoshan Power Staton at the workshop which is 176 m high and slope angle is 35as a whole. On the basis of analysis results by using the methods, the safety factor of slope is more than 1.30 which means the slope of workshop is stable in the natural state though there exits some tensile zone and plastic zone in rockmass on the slope. In consideration of the earthquake with magntude of 6.0 it is still in a limit equlibrum. But it is necessary to reinforce part of the slope in order to guarantee the workshop of Xiaoshan Power Station.