On a basis of understanding the domestic and foreign theoretical researches on ecological restoration engineering and related evaluations,the quality characteristics of slope protection engineering by vegetation were summarized and an evaluation index system was established in combination with the systematic engineering theory by threading structure stability &functional continuity as a guidance.This system contained three main evaluation indexes:mechanical protection quality,slope plant community quality and base material quality.Analytic hierarchy process(AHP)was conducted to determine the weight and order of each index.Meanwhile,according to the grey system theory,a low-cost hierarchy grey comprehensive evaluation model was constructed to evaluate the slope vegetation protection engineering handled with three different engineering measures in Pengzhou City,Sichuan Province,China.Results showed that the grades for all the slopes were ranked as good and the grades that slopes with the injection technoogy of thick layer base material mixture were better than those disposed with seed grilles or vegetation nets,which coincided with the factual account.All these outcomes indicated that the evaluation index system and its grades could objectively and accurately reflect the quality and grade of the slope vegetation protection system,which means that it has good practical values.