Abstract: Since the signal transmission of the interconnected system is based on two lines, this paper takes the parallel two lines as the research object, which is relatively typical in the low frequency cable coupling channel. Experiments were carried out to study the electromagnetic radiation sensitivity of the equipment whose single end of the interconnected system is non-linear. The radiation and injection equivalence of typical interconnected systems and the extrapolation conditions under high field strength are discussed. The experimental verification of whether the selected nonlinear devices meet the experimental requirements is carried out. The experimental results of using bulk current injection as equivalent substitute for strong field continuous wave electromagnetic radiation are analyzed. And the effects of different polarization modes of the antenna and the presence or absence of the large current injection probe on the equivalence research of radiation and injection are also analyzed.