The jamming mechanism of typical shipborne passive jamming material is introduced. A conceptual model of passive jamming scattering characteristic and jamming efficiency based on system particle theory is designed combined with the influence research on the complex electromagnetic environment of sea surface. The particle system theory is used to simulate the analysis of dipole-like interferences. The dynamic model building process and the scattering model of passive interferences are designed. The scattering characteristics of dipole-like interferences are analyzed by differential equation, integral equation method and vector transport theory and the conceptual model is established. The simulation results of the scattering characteristics of passive jamming material are given through simulation analysis, which provide theoretical supports for the interference technology of shipboard passive jamming material under complex electromagnetic environment.