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This paper presents characteristics of the HEMP radiation field on a typical transport aircraft using the frequency sweep method. Firstly, the characteristics of the HEMP field are analyzed. Then, various parameters including the electric field strength and magnetic field strength distribution are calculated using Altair FEKO software. Afterwards, the electric field strength distributions of three layers (top layer, inner layer and bottom layer) are calculated and analyzed. The results indicate that the HEMP induced field is affected by the aircraft body. The induced electric field strength <i>E</i>(<i>t</i>) varies greatly at different positions. Nevertheless, the peak value of <i>E</i>(<i>t</i>) is usually greater than the initial peak value of electric field strength <i>E</i>₀. Such a study can provide guidance and insight into the protection design of the HEMP of the aircraft.