Abstract: Layered strata have an important influence on the propagation characteristics of electromagnetic wave through the earth communication. The existing research is mainly based on the model of regular layered strata to ana- lyze the propagation characteristics of electromagnetic wave through the earth. However,the layered strata tends to be irregular. Therefore,the interface of layered strata is abstracted into plane,positive and negative slope based on the model of layered strata established. According to the geometrical relationship between the incident angle of electromag- netic wave and the inclined angle of layered stratum,the forward and reverse transmission attenuation characteristics of electromagnetic wave through irregular layered strata both for electric field intensity and magnetic field intensity are derived. Simulation results show that both the irregular of layered strata and the order of electromagnetic wave entering layered strata have an important influence on the transmission attenuation of electromagnetic waves. Although electric field intensity and magnetic field intensity are attenuated severely with the distance increase though the earth,the at- tenuation characteristics of electric field intensity and the magnetic field intensity are not the same. In addition,due to the reflection of electromagnetic wave in the interface of layered strata,electric field intensity and magnetic field inten- sity will attenuate abruptly to certain extent when entering into another layer.