Abstract: In order to overcome the unreasonableness of single assignment, the CRITIC method and the coefficient of variation method are integrated according to the principle of variational combination assignment, and the gray correlation coefficient formula is improved on the basis of gray correlation analysis, and the concepts of exponential function, variance and fuzzy Euclid posting progress are integrated comprehensively, and finally the formed new model is applied to the site selection of Ma'anshan emergency material reserve center. The new model is finally applied to the site selection problem of Ma'anshan emergency supplies reserve center, and the feasibility and validity of the constructed model are verified by examples.