Abstract:In this paper, the SPSS software is used to dig and analyze the mass data of basic power supply enterprises. By using correlation analysis method, principal component extraction method and comprehensive clustering method to reduce the dimension of index data, a comprehensive evaluation index system for basic power supply enterprises is constructed. Then the weight of each index is calculated by the improved analytic hierarchy process based on the Delphi method and experts’ experience. According to the actual operation situation of each enterprise, the differential weight of various indexes is constructed, and then the comprehensive evaluation and score of differentiation for the power supply enterprises at the grass-roots level are realized. Through the vertical and horizontal comparison of basic power supply enterprises, the weak links of each enterprise''s operation and power grid development are pointed out, and the enterprise investment strategy and construction emphasis are put forward. Through the practical application in Shanxi power grid, 98 grass-roots power supply enterprises are divided into five categories, and through the comprehensive evaluation of enterprises, the corresponding suggestions for upgrading are put forward. It has fully proves the value of this method in theory and practice application. And it has good landing and scientificity in carrying out comprehensive evaluation for basic power supply enterprises.