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Environmental pollution and energy shortage are two great problems, which impact achieving the development of sustainable society. And the important way to solve the problem is to develop and promote electric vehicles, and to research global optimization and control theory on the energy system of electric vehicles under V2G mode. This article describes the status studies of theoretical at home and abroad, and summarizes the lack of current research. On this basic, it proposes the research and development trends in the future, which has some reference value for the following study of the theory and application.