Abstract: From the perspectives of power grids and electric vehicle users, this paper introduces the application status of Vehicle-to-Grid (V2G) at home and abroad, and analyzes the negative impact and the change of load prediction of the V2G technology on the grid side. Two factors that motivate EV users to participate in V2G are discussed: one is TOU price, and the other is battery loss, and a conception of guiding V2G is put forward. Future EV applications in renewable energy and virtual power plants are then explored. Finally, the existing difficulties in the practical application of V2G are summarized and the prospect is put forward.