In the field of TEM,we make the imaging underground directly by transplanting lots of technology that is usually used for seismic exploration,to improve the resolution of images electric of interfaces.The ill-posed characteristics will be overcome if doing that.Firstly,balanced coefficient must be calculated based on the suppositional waves transformed from TEM,as the amplitudes of them,which grow out of the interface,have always differences. Secondly,the broadening and earth filtering effects can be proximately countervailed,if the result of deconvolution of discrete data are figured out.Then,it is possible for us that the positions of electrical boundaries are located.At last, the final outcome,that is the extension imaging by inversing time from the surface to underground with fictitious seismic waves,will be obtained if we take above data after low pass filtering into Kirchhoff integral formula.The TEM continuation method has been generated when we put the principle of wave field analysts into the explaining of TEM.It makes the connotation of transient electromagnetics widen and abundant,from the wave field view.It's easier to get the information that is difficult to obtain without that technique in the past.The depth of the electrical interface that we calculate becomes more accurate after the continuation imaging.At the same time,it provides significant theoretical basis and experimental reference for rational introduction of the seismic treatment method into TEM.