Abstract: A new discriminant analysis method was brought forward to solve problems such as the complexity of slope stability factors and the hugeness of computation workload by the traditional slope stability analysis method. Six indicators that are widely used in slope stability analysis, which included slope gravity, cohesion force, friction angle, slope angle, slope height and pore pressure ratio, were used as discriminant factors to establish a discriminant analysis model for slope stability forecast. The analysis result of typical project examples shows that this method is simple and feasible, and has stronger analysis reliability. It can eliminate the influence of human factor in discrimination and classification of slope stability and can be used in practical engineering.