Abstract: The unreasonable layout of charging facilities and the unbalanced connection between the stations lead to inefficient use of urban charging network and unsatised demand for new energy vehicle charging. In view of this, on the basis of the existing charging network, we define the network strategy of new charging facilities two dimensions:network centrality and the number of charging piles, and construct a dynamic simulation model of charging network to simulate the promotion of charging facilities construction under different strategies and to reveal the evolution trend of urban charging network structure characteristics and use efficiency. The results show that when the four strategies of moderate development, moderate reduction, deep development and coordinated development are adopted, the overall utilization efficiency of urban charging network will be improved to a certain extent, but there are differences in the evolution trends of the charging network and its utilization efficiency under different strategies; merely increasing investment in the construction of charging facilities does not lead purely to higher efficiency of a city's charging network as continous construction at an agreessive pace may bring negative spillover effects.

Key words: charging facilities, complex network, new energy vehicles, use efficiency