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With the improvement of technology, the demand for electrical power continues to deepen. Wireless Power Transfer (WPT) technology can transmit power without using physical media such as cables, and it has the advantages of electrical isolation, convenience, and safety. At present, the miniaturization of the secondary side is an emerging trend of WPT systems, which is analyzed in this paper. By introducing an interleaved boost converter in the front stage, the DC bus voltage of the primary side is increased, the loss of the primary side is reduced, and the system efficiency is improved. At the same time, the self-inductance of the primary and secondary sides of the loosely coupled transformer is designed to meet the stress requirements of passive devices and the realization of a closed-loop system. Finally, a WPT system with an input voltage of 100 V, an output voltage of 100 V and a transmission power of 500 W is built. The transmission distance of this system is 170 mm, with a lateral offset of 200 mm and a vertical offset of 100 mm. After the offset of the primary and secondary sides, the output voltage can be stabilized at 100 V, and the system efficiency can reach 90.1%, which proves the feasibility of the system efficiency improvement strategy and the effectiveness of the closed-loop control.