With reference to the geological feature of the slope of the Yangfanggou Hydropower Station,a three dimension model was established.By means of the visualized calculation software,the paper went on discussing the stability state of the slope based on the theory of the three dimension limit equilibrium method and the theory of blocks.The sensitivity analysis of the parameters and the influence of the anchor angle on the safety factor were presented later.The result can be served as a kind of reference to sim...