Due to the inevitable variation of component parameters, interference of ferromagnetic foreign body, active regulation of operation frequency, and rectification effect caused virtual capacitance or inductance, zero-phase-angle (ZPA) operation and zero-voltage switching (ZVS) could hardly be maintained without extra control strategies, especially for high-order compensation WPT system. Accordingly, this article proposes and implements an impedance buffer-based reactance cancellation method for a capacitor-inductor-capacitor-series ( CLC-S ) compensated wireless power transfer system with robust ZVS. The proposed reactance cancellation method adopts a synchronous impedance buffer series connected with the CLC compensation network to realize full-range ZPA operation. It can also be regulated to ZVS switching conditions under a large tolerance of the abovementioned issues. In addition, the proposed concept holds the characteristic of communication-free, feedback-free, simple control, and no strict constraints imposed by parameters in high-order compensation. Theoretical analysis, simulated, and experimental results are given to verify the feasibility of the proposed reactance cancellation method.