Abstract: To solve the shortcomings that auxiliary switch of traditional ZVT-PWM converter is hard power-off,the paper proposed a scheme of the new type of soft-switching Buck converter with PWM control,introduced topology and working principle of the new type of soft-switching Buck converter in details,and gave concrete designing process.The auxiliary circuit of the Buck converter makes main switch work in zero-voltage state,all semiconductor devices work in condition of soft-switching,which decreases losses of the switch.The simulation result proved validity of the scheme of the new type of soft-switching Buck converter.