On the basis of the traditional distribution network evaluation system, this paper fully considers the environmental protection effects brought by distributed power sources connected to the distribution network, and establishes an environmental protection distribution network index evaluation system. Aiming at the problem that the traditional AHP method using a single weight calculation can easily lead to inaccurate weighting, an improved AHP method is proposed. The improved algorithm uses geometric averaging method, arithmetic averaging method, eigenvector method, and least square method to calculate weights and take the average value as the final weight. The calculation of two distribution networks verified the rationality of the proposed index evaluation system and the effectiveness of the proposed algorithm.