Abstract: This paper focuses on the shielding effectiveness(SE) of reinforced concrete against offline electric arcs in pantograph-catenary systems of metro under plane wave. Based on the finite integration technique(FIT), the SE of the reinforced concrete under the plane wave is calculated and analyzed. The influence factors of different concrete structures on the SE are discussed and the shielding effectiveness of a metro station is measured. Research results show that the SE of concrete against electromagnetic wave is periodic, and the increase of thickness has little effect on the SE in the high frequency band. The SE of the rebar is greater than 30 dB in the frequency range from 0.1GHz to 0.8GHz. The SE of double layer reinforced concrete in the 0.1—1.3 GHz is larger than 40 dB. The measured SE is in good agreement with the numerical results of the model, which verifies the correctness of this method in calculating the SE of the electric arcs in pantograph-catenary systems.