The electric vehicle is the future direction of the automotive industry. As the ancillary service facility of electric vehicles, the development of charging station is rapid. Through simulation analysis of single charger’s load characteristic based on PWM rectifier + DC / DC converter topology, its mathematical model is obtained. Based on the load characteristics and using the mathematical model, probabilistic modeling of a variety of random factors affecting the charging station loads is carried out respectively. On this basis, using Monte Carlo modeling methods, comprehensively considering the influence of various random factors of charging station load, the static load model reflecting the charging station time-varying characteristics is got and the daily load curves under different permeability are given.