Abstract: The coupling effect of the low-frequency nonnuclear electromagnetic pulse (EMP) on the electrically large complex object is analyzed. A method of modeling and analysis for the coupling effect is presented based on finite-difference time-domain (FDTD) method. A simulation experiment of low-frequency EMP excitation is carried out on a model with a scale of 1∶1, the coupling characteristic data are analyzed, and a protective method is proposed. The results show the engineering applicability of the modeling and analysis method and the shielding efficiency of the transparent conductive material to coupling effect.