Of so many uncertainty methods, traditional destruction probability and random simulation theory is widely applied to stability analysis of landslide. However, in practical work, the effects from factor correlation are not considered in the method. Due to this limitation, principal component-stepwise regression algorithm is introduced, and PCR-SPA-MC coupling mode) is founded. Based on theoretical discussion, an engineering instance analysis of the Zhaoshuling landslide is presented. The analysis shows that the result from PCR-SPA-MC model is more ideal than that from traditional destruction probability method.