The synchronous transmission of wireless power and signal is one of the research hotspots in wireless power transfer (WPT) technology. This article analyzes the resonant frequency design method of LCC-S compensation network and proposes a design method for high, low frequency, and frequency switching of signal transfer. Designed a signal modulation and demodulation scheme based on frequency switching, and established a Matlab simulation system. Combined with WPT-HW protocol, the system is simulated to verify the validity of (Wireless Power Transfer with Harmonic Wireless Communication) the system to achieve reliable simultaneous interpreting and the correctness of optimizing the system performance through the protocol.