Abstract：In order to study the effect of the nonlinear joint on intensity of the electromagnetic emission(EME) during propagation process，the relationship between induced EME and incident stress wave was presented based on piezoelectric effect mechanism. According to the obtained relationship and the resolution of transmitted and reflected coefficients when the normal incident P-wave propagated to the nonlinear normal deformation joint，the relational expression between the intensity variation of EME and parameters of joint was obtained. And the effects of parameters such as joint deformation and incident frequency of wave on the intensity variation of EME were investigated. It is shown that the intensity of the EME induced by stress wave was the highest in the explosion-center and attenuated with the propagation distance；the intensity of the EME increased with the joint deformation；the higher frequency EME attenuated faster than the lower frequency signals.
