Abstract: With the increasingly harsh electromagnetic environment of the battlefield, the technical requirements for assessing the adaptability of weapons equipment to the conditions of strong electromagnetic fields have become higher and higher. In the study about taking bulk current injection to replace continuous-wave strong-field electromagnetic radiation, the effect of current injection probe is unavoidable. In this paper, an experimental method was analyzed to implement injection equivalent radiation replacement for nonlinear interconnected systems. The bulk current injection probes of key devices and their equivalent circuit models were introduced. Through theoretical analysis and experimental verification, it is found that the equivalent error is not negligible when the radiation experiment performs without bulk current injection probe, and the same equivalent circuit must be provided for both radiation and injection conditions. The test results on the probe performance show that, at 150 MHz frequency, the linear error of probe injection and output can be higher than 12% when the injection power reaches to 60 W, demonstrating the effect of performance of injected probe itself on the equivalent in the equivalent high field electromagnetic radiation experiment.