Abstract: Aiming at the problems of many control factors, difficulty in overall quantitative analysis, and one-sidedness of current method in the evaluation of karst curtain grouting, this paper proposed a grouting effect evaluation model based on fuzzy comprehensive evaluation method.Firstly constructing a model factor set U,an evaluation set V,and an evaluation matrix R.Then the weight coefficient vector D based on AHP was determined, the decision set E was obtained through the fuzzy synthesis operator, and the multi-dimensional quantitative evaluation of the grouting effect was realized.The model was verified and analyzed by Goupitan Hydropower Station.It showed that the evaluation model of grouting effect proposed in this paper had good synchronization with the current method.Compared with current the method, the proposed model can not only feeds back the water permeability of the rock mass after grouting, but also interpret the integrity of rock mass and the sealing degree of karst after grouting.This model has a higher evaluation dimensions and more comprehensive and real evaluation system, and has broad prospects for industrial promotion.