Abstract: A magnetic pulse modulator has been proved to be a very hopeful pulse generator.We designed and assembled a small one to demonstrate our design method with the available ferrite toroids with 68mm O.D..28mm I.D.and 25mm thickness and B=B+B=0.68T.The experiment is very successful.An output voltage pulse of 30kV with pulse width 52ns.rise time 15ns and rep-rate up to 1 kHz has been gained very stably.The total energy transportation efficiency is 42%.This success brings the possibi-llity of building high power level magnetic pulse modulator.