Aiming at the planning of electric vehicle (EV) charging facilities, an optimal grid generation method based on different electricity prices is proposed. Firstly, the economics of charging facilities are analyzed from the perspectives of construction cost, operation cost, power grid benefit, user benefit and charging station benefit. Second, according to the function and behavior rule, cities can be divided into five groups, area, analysis the travel law of private cars, taxis, buses and the rule of the charge and discharge, the private cars for the first time, travel time, travel chain, residence time, the taxi passenger time interval probability modeling, and considering the influence of electricity price on the will of the user, to establish load model. Finally, Monte Carlo simulation and Voronoi diagram principle are used to realize the optimal grid generation. The calculation results show that EV access to the power grid can cut peak load and reduce peak and valley difference. Within a certain range, with the increase of discharge price, the reduction of power network operating cost increases, the revenue from electricity sales increases and the growth slows down, and there is an approximate linear relationship between charging station benefits and valley charging price.