Abstract: Aimed at the zero-voltage soft-switching of leading-leg power devices in full load range, the resonant process of leading-leg parallel resonant network was analyzed fully after decoupling of the leading-leg parallel resonant network and transformer primary side series resonant network in phase-shift controlled full-bridge soft-switching power converter. Based on the theoretical computation and circuit simulation, the influence laws of power output current, resonant inductance and capacitance on the switching dead-time and loss of leading-leg power devices were researched. Taking the loss of resonant inductance into account, a design approach of resonant inductance and capacitance was provided. On the above basis, by experiments, the data of dead-time changing with output current for leading-leg power devices was acquired; the voltage and current waveforms at no-load state were also measured. The experimental data and waveforms agreed well with the theory and simulation results.