As more electric vehicles (EV) are charged in the power grid and power selling policy is open, the operators not only need control load well, but also get good benefit. A coordinated charging/discharging strategy considering customers’ factors is proposed. The customers actively respond to participate in V2G reserve power supply and declare the price. The operator synthetically considers a customer’s comprehensive index and his EV’s state to screen the EVs participating reverse power supply, and then implements the coordinated EV charging/discharging plan on the condition of satisfying the power limitations of the grid. Monte Carlo simulation and Particle Swarm Optimization (PSO) algorithm are used for simulation and calculation. The results show that with the coordinated strategy, it can not only realize the peak load shifting, but also make the operator get more benefit and the customers’ charging cost lower.