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To analyze the interference effects on a certain shortwave radio of low frequency wide pulse electric field, irradiation experiments are carried out. Through theoretical analysis, simulation and experiment, the effect rules and interference mechanism are confirmed. The results show that low frequency wide pulse electric field, which rise time is not less than 10ns and the pulse width is more than 1ms, can interferes the normal working performance of shortwave radio. But it cannot damage the shortwave radio even the field intensity reaches 100kV/m. The main interference phenomenon is communication interruption, while it can comeback in a few seconds, usually about three or five seconds. It should be noted that the interference phenomenon happens in a certain frequency range. And in the range, the threshold interference field intensity rising with the increase of the frequency.
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