Abstract: To solve the problem of high early-destruction rate of a certain fuze in target practice, an experiment method is proposed. Interactional effect experiments were done. And the interactional effects rules were analyzed. Also, the failure mechanism was got. The experiment results show that many factors affect the threshold interactional distance, such as relative velocity, relative pose, relative height, irradiation energy, irradiation frequency and power supply manner. The failure mechanism is that when the fuzes move to each other, frequency pulling occurs because the irradiation energy and frequency are close, and the detection voltage signal is fluctuate, which leads to the mis-action of the fuze.