Abstract: This paper mainly focuses on the research on the detonation of heavy explosive reactive armor by the shaped charge warhead. The pre-processing software TrueGrid was used to establish a numerical calculation model for the detonation of heavy explosive reactive armor by the shaped charge jet, and the nonlinear dynamics software LS-DYNA was used to conduct a numerical simulation study on the problem. The post-processing software LS-prepost was used to obtain the influence of different impact positions on the detonation characteristics and scattering characteristics of ERA. Numerical simulation results show that the impact position has a significant influence on the detonation and scattering behavior of ERA. The closer the impact position is toward the edge of ERA, the lower the peak detonation wave pressure after the detonation of the interlayer charge; the later the flying plate starts to move, the shorter the acceleration time of the flying plate is, and the lower the flying velocity is, the longer duration interference to the jet will be.