The rational planning site for electric vehicle(EV) charging station is directly related to the distribution network stable operation, the power quality and development of EVs industry. It is comprehensive considered the needs of three areas, the government, the power company and the users. In this paper, According to the specific cases affecting the charging station planning, the key factors are chosen to establish a new kind of EV charging station planning evaluation system which includes 5 categories, a total of 9 indicators, then the meaning and composition of each indicator are analyzed. In the actual case for charging station siting, the Delphi method is used to quantify the various indicators according to the original data for the candidate sites. Then based on the evaluation index system, it is combined with AHP and gray evaluation method to obtain the optimal evaluation value of each candidate site, providing the basis for the optimal charging station siting decision.