With the popularization and application of electric vehicles (EVs) and the presentation of vehicle-to-grid (V2G), the charging load has a great influence on the security and economy of the microgrid operation. On this basis, how to make reasonable control strategy for plug-in EVs and ensure the safety operation of microgrid becomes a problem to be solved. Based on the wind-solar-battery grid-connected microgrid with EVs, a multi-objective optimization model is proposed to minimize the interactive power between microgrid and the main power grid and balance the fluctuation of wind-solar power output. Taking a microgrid in a certain commercial area as an example, the reasonability and the validity of the proposed optimization model is verified in several key aspects of microgrid, such as the economic operation, daily interactive energy and average variation of the output. Simulation results show that the integration of EVs with regular patterns and renewable energy resources in the microgrid environment, which can not only realize the economic operation but also improve the interactive power and output fluctuation, is an ideal coordinated mode. This work is supported by National Natural Science Foundation of China (No. 51407160) and Natural Science Foundation of Zhejiang Province (No. LY16E070005).