The lightning strikeback model is an important part of the research field of lightning electromagnetic field. In order to study the lightning electromagnetic field in a deeper level, it focuses on the engineering model in the lightning strikeback model, and combines the most widely used MTLE model in the field of electromagnetic compatibility to select the Heidler function as The current waveform at the bottom of the lightning strikeback channel is simulated by MATLAB, the parameters in the model are changed, the simulation waveform is observed, and the characteristics of the MTLE model and the influence factors of the lightning strikeback channel current are summarized, which is helpful for further exploration of lightning protection.