Abstract: With the rapid development of electric vehicle technology, the huge number of on-board batteries will become an important resource for the power grid to cut peak load and fill valley. The development of reasonable discharge electricity price will be conducive to mobilizing the enthusiasm of both sides of the vehicle network to participate in the interaction. Based on the evolutionary game theory, an evolutionary game model is established for the benefit equilibrium of electric vehicle users and power supply companies, and the dynamic evolutionary stability process of the vehicle network is studied. The case study results show that the discharge price has a specific response range, and only within this range, both sides of the vehicle network can benefit from it, thus achieving a benign interaction. This study can provide a reference for the power supply companies to formulate discharge electricity prices.