In order to solve the problem of complexity of zero-crossing detection and distortion of input current waveform, a novel control method is proposed for interleaved Boost PFC converter operates in critical conduction mode. This method is based on a new switching voltage detection circuit. By detecting the drain-source voltage of MOS transistor, the zero crossing signal is obtained through the comparator, and switch achieves zero voltage switching or valley switching, which greatly reduces the switching loss. Adopting the switch conduction time compensatory strategy, it improves the average inductor current and distortion of input current waveform caused by resonance between inductance and parasitic capacitance of MOS transistor. Finally, an 800 W prototype is built and experimental results show the efficiency and feasibility of this method.