First, the choice of charging location. Wireless charging technology is related to the distance and state of the charger and the device being charged, that is, the distance between the two cannot be too large, and there is no relative movement between the two, otherwise it can not be stable and effective transmission of power. Therefore, the charging location can only be the place where the car stays, that is, the garage, the parking lot, the intersection and other locations, the bus charging device can also be set in the bus website. Of course, conditions permit places or highways can also be specially set up charging stations to facilitate the charging of vehicles.Secondly, the choice of charging method. From the three charging methods, it can be seen that the distance required for electromagnetic induction charging is too small, the efficiency of radio wave charging is too low, and the distance and efficiency of electric magnetic resonance charging can meet the needs of battery cars.Finally, the choice of rechargeable batteries. Electric vehicles will be charged at any time in the city, so it is necessary to choose a pollution-free and no memory effect of the battery to charge.