Well electromagnetic method has been widely used in geological exploration due to its unique advantages. Currently more widely discussed frequency domain well ground electromagnetic method, with the shallow oil and gas has been developed as well as unconventional strata and many other conditions continue to limit, people in the frequency domain well ground electromagnetic on the basis of well ground transient electromagnetic method is proposed, the method is widely used in mineral resources exploration, hydrological surveys, unexploded ordnance detection, etc., through the processing of vortex electromagnetic attenuation of the secondary electromagnetic field information generated by the inversion of the stratigraphic information. It has the advantage of weak shielding against high resistance, as well as high vertical resolution of anomalies. However, the theoretical discussion of well transient electromagnetic is still relatively small, especially the study of the spatial and temporal distribution characteristics of transient electromagnetic field of electrical sources, and the most difficult to overcome here is the test of the correctness and validity of the method used. Therefore, this paper discusses the characteristics of the spatial and temporal distribution of the transient electromagnetic field in ground wells on the basis of verifying the correctness of the executed program, focusing on the characteristics of the diffusion of the field values of the electromagnetic field components with time.