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With the development of the power system, protection for the electromagnetic interference is very important. Although protective measures of electronic equipment are improved. But the chassis itself shielded by the existence of defects (such as ventilation holes), leading to the shielding performance decline. In this paper the transmission line matrix method is applied to study electromagnetic signals couple in electronic equipments in electric power system through aperture and interact with the built-in PCB circuit, a rivet and overlap connection model is created, and further we calculate the induced current in the simulated circuit on PCB. The simulation results are closer to reality, and it makes more significance for the design of the actual shielding and circuit.