Abstract: Considering the energy-saving indexes and energy consumption influencing factors of distribution network, a technical and economic evaluation system for energy-saving transformation of primary equipment in distribution network is established, covering the evaluation indexes of power supply capacity, technical equipment, reactive power compensation measures and new energy-saving technologies. Based on the analytic hierarchy process (AHP) and entropy method, the weight of each single index of the index system is calculated, and combined with the state value of the single index, the comprehensive energy efficiency score of the distribution network is obtained. Based on the life cycle cost, the distribution line and transformer are optimized, the reactive power compensation device is added, and the life cycle cost (LCC)-benefit model of new energy-saving equipment is established. Combined with the method of cost-benefit analysis, the economic evaluation of energy-saving transformation scheme of distribution network is carried out. Finally, the effectiveness and practicability of the index system, evaluation method and economic evaluation method are verified by an actual distribution network in a certain area.