The effect of radiofrequency on three different hotbridge electric explosive devices was studied by experiment and calculation. The sensitive frequency were measured using conduction method,and the radiofrequency sensitivity was tested and calculated in the condition of sensitive frequency based on the updown method. The sensitive frequencies are 0.4 GHz through detection test of 30 samples for each electric explosive device; the fire powers are 2.818 W,0.428 W and 0.897 W at 50% fire/no fire through radiofrequency sensitivity test of 30 samples for each electric explosive device,and the radiofrequency sensitivity decreases along with the increase of electric resistance of hotbridge.