With the global shift towards clean energy, electric vehicles (EVs) are gaining increasing attention. However, range and battery lifespan remain key factors limiting their adoption. Wireless charging combined with constant current and constant voltage (CC-CV) charging methods offers a viable solution to extend EV range. This paper proposes a dual-mode wireless power transfer system based on an LCC-LCC composite compensation topology and variable capacitance regulation. By dynamically adjusting the equivalent capacitance at both the transmitting and receiving ends, the system enables seamless switching between CC and CV charging modes under zero-phase angle operation while maintaining a high power factor. Simulation results validate the system's CC and CV output characteristics, demonstrating the system's ability to switch modes based on load demands, with output current and voltage staying within the preset ranges.