In the context of the development of carbon peak and carbon neutral, the promotion of electric vehicles (EVs) provides a strong support for the realization of lowcarbon goals. For investigating the impact of EVs on the carbon emission, the paper firstly,analyzes the coupling relationship between the scale of EVs, regional energy composition, VehicletoGrid (V2G) technology and carbon emissions. Secondly, the district energy development path is constructed according to the development law of the clean energy. Finally, based on the principle of system dynamics, a dynamic feedback model of the evolution of the regional carbon emission trajectory with the integration of V2G under the development of the clean energy is established.Finally, the paper takes the data of a city in southwest China as an example to conduct dynamic evolution simulation, in which the development scale of EVs and the development path of the clean energy are taken as main variables to analyze the impact of EVs on regional carbon emissions under various scenarios. Besides, this paper also verifies the carbon emission reduction benefit of EVs through the sensitivity test. Simulation results indicate that the development of the clean energy has the most significant impact on the carbon emission reduction, and the V2G technology has huge benefits on the carbon emission reduction.