Using electric vehicle can effectively alleviate the energy crisis and environmental pollution and the researches on electricity-related problem are very necessary and urgent. First, this paper analyzes the new power industry chain structure of EV charging system and establishes the related system dynamics model taking into account the economy of the industry chain. Then, it collects the basic data from a specific scale of EV charging system, uses the Vensim software to operate the system simulation through changing values of profit rate, profit adjustment rate, electricity price sensitivity, and so on. It quantifies the electricity consumption and charging price, and gets equilibrium values and curves related to both investment recovery period and electric charging models to search for the optimal decision reference, which has a realistic significance. Finally, the paper summarizes the advantages and disadvantages of the model and gives some suggestions for model improvement.