Abstract: The computation is carried out for the inductive energy storage pulsed power conditioning system with an exploding wire opening switch. On this basis,a smallsized inductive energy storage pulsed power conditioning device which outputs peak power of more than 20GW, is developed and tested. When energized by a 4μF/100kV capacitor bank operating at above 64kV, a pulse voltage and pulse current in excess of 400kV and 60kA respectively with over 100ns duration is obtained on a 6～8Ω load. The peak power exceeds 2０GW.the efficiency of energy transfer is more than 30%．