Electric vehicle(EV)charging stations are important infrastructures which directly influence the convenience and economy of EVs. The rationality of charging station location is one of the key factors which can decide the popularity of EVs. In order to improve the coverage and service rate of charging stations

the features of EVs are analyzed and a model for EVs' charging demand is developed based on the travel chain. The charging demand is set as one of the indices to optimize the charging station location. Then

based on the idea of Voronoi

the immunity algorithm method is used to develop the model of charging station location for obtaining the rational distribution of the charging stations. The optimized results have enlarged the range of charging while improving the service rate of the station.