Electric cars are the smart grid is an important part of a good solution to energy shortages, environmental pollution and other issues. Wireless charging technology is more conducive to interact with the grid electric cars, electric vehicles play better load shifting, renewable energy consumptive functions. This paper studies the development of electric vehicles in China on the basis of relevant policies, combined with the characteristics of wireless charging of electric vehicles, based on statistical data, using the Monte Carlo method for extracting a private electric car trip mileage, according to the vehicle battery charging characteristics and habits to get electric cars the initial charge state of charge, charging time charging power and start to build up a more accurate prediction of private wireless charging electric vehicle charging load mathematical model, and in 2015 and 2020 conducted a private electric vehicle charging load forecasting . A large number of electric vehicles