Aiming at the problem that the disorderly charging behavior of electric vehicles affects the operating economy of the integrated energy system, an integrated energy system optimal dispatch strategy that takes into account the elastic electricity price demand response of electric vehicles is proposed. This strategy first analyzes the charging behavior of electric vehicles, introduces incentive demand response, and considers the elastic electricity price based on the time-of-use electricity price, and establishes an electric vehicle elastic electricity price demand response optimal dispatch model；secondly, under the premise of meeting the normal operation of the system. The goal is to minimize the operating cost of the integrated energy system. A regional integrated energy system model with electric vehicle demand response is established and solved by hybrid linear programming. Finally, model sets three scenarios and four different flexible electricity prices based on whether electric vehicles participate in demand response. Make comparisons and analyze the equipment output and system operating costs under different scenarios and different electricity prices. The simulation results show that it is feasible and economical to guide electric vehicles to participate in the demand response of the integrated energy system through flexible electricity prices.