A new powerful primary explosive nickel hydrazine azide(NHA) was used as charge for semiconductor bridge(SCB). The optimal conditions for the ignition were obtained: pressure 60 MPa; capacitance 47 μF; particle size of the primary explosive 49 μm. U-t curves and U-E curves show that NHA is ignited by the plasma generated by SCB at high voltage,and NHA is ignited by hot spot generated by SCB Joule-heat at lower voltage.