Abstract: The propagation attenuation characteristics of electromagnetic wave penetrating different media are analyzed applying the theory of the electromagnetic plane wave and Fresnel formulas. They are numerically compared by adopting different parameters such as polarization, incident angle, dielectric permittivity, conductivity, tangent of dielectric loss angle and frequency. The total transmission loss versus frequency is simulated for often-used walls such as common concrete wall, 37 brick wall, 24 brick wall, hollow plasterboard, cement board with polystyrene, wood block and organic glass. The attenuation characteristics of new walls and hollow clay brick walls are analyzed. The simulation results are also compared with laboratory measurements and that from referenced literatures, which shows