Large scale electric vehicles, as the power load of mobile storage, will lead to the problem of load peak and valley difference and load rate reduction. In this paper, the control strategy of ordered charging and discharging of electric vehicles based on V2G is studied from the perspective of the power grid side and the user side. On the grid side, we made the load curve of the minimum mean square error as the objective function, on the user side, we made the benefit maximization of electric car users participating in the maximum V2G as the objective function.And the actual electric vehicles charge and discharge power, available capacity and user daily setting constraints are taken into account in sumulating test. Taking the orderly charging and discharging of electric vehicles in Chongqing in 2020, 2025 and 2030 as an example, the optimization and control analysis of electric vehicle's orderly charging and discharging on the grid side and the user side are carried out. The results show that the proposed optimal charging and discharging control model of electric vehicles on the grid side and the user side can effectively reduce the load peak valley difference, smooth load curve and bring economic benefits to users involved in V2G services.