Abstract: Distribution transformer is one of the key equipment in the power system. Its quality is directly related to the continuous and stable operation of the power system. At present, the distribution transformer manufacturing industry is overcapacity. The quality of distribution transformers is different strictly. It has great significance to research and set up holographic models of distribution transformer suppliers, which is helpful to the purchase of high-quality equipment and ensuring the safe and economical operation of the distribution grid. With the continuous development of information and communication technology, the major power companies have launched an electronic bidding procurement, which improves the procurement efficiency and quality. In order to promote the integration of the depth of the Internet and bidding, the national action plan of Internet plus bidding is released nowadays, which puts forward higher requirements to the electronic bidding. Distribution transformer supplier information is the basis for supplier evaluation and selection, and is also one of the important contents of the electronic tendering platform. According to the actual situation of power enterprises, the related information of distribution transformer suppliers and their products is analyzed in depth. The research on information structure and standardization is carried out. The holographic model of distribution transformer supplier is established, which includes 4 modules, 14 data domains, 47 data tables, and more than 470 data items. The identification method of key factors of distribution transformer suppliers based on AHP is proposed. The evaluation index system of transformer suppliers is worked out, which includes 14 first level includes, 47 second level includes. The evaluation indexes are comprehensive, objective and quantifiable, and the evaluation method is also objective, which avoiding subjective impact and realizing the objective quantitative evaluation of suppliers. Finally, the method is applied to distribution transformer suppliers for example analysis, which verifies the practicability of the evaluation method.