The invention relates to the field of power supply of the distribution network, and particularly relates to an evaluation index algorithm for AC and DC distribution network power supply mode selection, so as to realize selection of the best power supply mode. The algorithm comprises the following steps: 1, a technicality evaluation index system is built; 2, a power supply reliability evaluation system is built; 3, an economy evaluation index system is built; 4, a sociality evaluation index system is built; and 5, an environmental protection evaluation index system is built. Compared with the prior art, the algorithm of the invention has the following advantages that the built index systems cover technicality, power supply reliability, economy, sociality and environmental protection, and various performances of the AC and DC power supply network can be reflected thoroughly and objectively; and the built index systems are combined with the existing evaluation method for selection of the AC and DC distribution network power supply mode, and the practical engineering value is high.