The finite-difference-time-domain method is applied to simulate the two-dimensional propagation ofa p-polarization mode electromagnetic wave in atmospheric plasma and metal layer for strong electron-neutral collisions. It is indicated that for a giving electron density profile, the p-polarization attenuation is very different from the spolarization attenuation and it depends even strongly on the incident angle. The mechanism of p-polarization attenuation is analysed by the interference of wave and the relationship between the attenuation property and the main parameters is given.