In recent years, with the rapid development of the new energy vehicle industry, the related charging issues have become the current research focus. Aiming at the influence of the change of coil spacing and the change of coil eccentricity on the charging efficiency of new energy vehicle wireless charging. In this paper, a coil position calibration system is designed based on THE WIRELESS charging topology structure of SSC, so that the center of the transmitting end coil is aligned with the center of the receiving end coil, and the best alignment position is found to increase the area of the two coils, so as to obtain the best charging efficiency.