Abstract: In reflective seismic exploration, the reflection of the waves from interfaces of media can be observed and recorded as time-related series, which compose the seismic records. The reflective series revealed by the records can be regarded as the pluse response of the underground media. Similar to the elastic wave field, TEM electromagnetic wave field has both reflection and transmission too. There is the condition of seismic interpreting for quadric field based on their similarity of transmitting in the media, and it is the key to understand the closely connect between electromagnetic wave and elastic wave for contrast analyses of the reflective modulus functions. In this paper, it is introduced how to apply the mentioned theory of interpreting seismic data to interpret electromagnetic data.