Abstract: Misalignment between coupler of inductive power transfer（IPT） system causes fluctuant output voltage deviated from rated value, decreasing the availability of IPT.Therefore, this paper proposed a series-series（SS）compensated topology based parameter optimized method to improve the stability of voltage gain under various load and misalignment conditions. Finally, a prototype was set up to validate the performance of the proposed method, and experimental results indicate that the voltage gain is ranging from 0.52 to 0.64 with fluctuant ratio of 10.3% with the mutual inductance from 47.5?H to 66.6?H and AC load resister from15? to 25?. At the same time, the DC/DC efficiency of the overall system is no less than 94.2%, while the maximum efficiency is up to 95.79%.