[Objective] A scientific and reasonable stability evaluation model for slope protection vegetation system was established to evaluate the stability of alternative slope protection vegetation systems in order to provide reference for the selection of slope ecological reconstruction scheme.[Methods] Using hierarchical analysis method, we established a stability evaluation index system of slope vegetation system by synthetically analyzing the main factors from slope and vegetation. And the main indexes include rock quality index, integrity ratio, community coverage, vegetation landscape grace and so on. Then, entropy method was used to calculate the weights of evaluation indexes and relative entropy evaluation method was used to calculate the relative closeness values of alternative schemes. Then we established an optimization model of slope vegetation system based on entropy method and relative entropy evaluation method. Finally, the model was used to evaluate the stability of the four slope protection vegetation systems that could be used to restore the ecological system of a highway slope in mountain area.[Results] The superior degrees of the four slope protection vegetation systems were 1.90%, 5.37%, 2.98% and 99.99%. The forth slope protection vegetation system[mixed planting 3 plants and the Trifolium repens:bermuda grass=1:3, the herb:bush plant (Magnolia multiflora)=1:5] was the optimal vegetation system. The optimum result was consistent with the optimum result based on fuzzy matter-element method and the result of engineering practice.[Conclusion] The model is effective and feasible, and can be used to guide engineering practice.