As the new environmentally friendlyand energysaving vehicle, the application scale of electric vehicles is increasing rapidly.Bringing electric vehicles into microgrid is also thedevelopment trend of the power grid. The electric vehicle,having properties of flexible power demandandbidirectional energy fluidity, has become a significant part of balancing loads in the microgrid. In this paper, an economic dispatch model of microgrid with electric vehicles is established, and the Lingo software is utilized to solve the optimization problem. The power supply of various kinds of energy is adjusted through the improved model. The optimal combination of electric vehicles in the microgrid is obtained by considering the cost of environmental governance in the optimization goal, which reduces energy loss and improves the utilization of resources.