Abstract: Abstract Based on analyzing the problem of the lightning electromagnetic signals coupled by stick antenna, the experiment and the theory are combined to find the equivalent circuit used to illustrate the antenna receiving electromagnetic signal.After the analysis of the spectrum of lightning electromagnetic wave signal and the distribution of the energy, a new method using transient voltage suppressor (TVS) to suppress the electromagnetic coupled by the stick antenna is proposed.In the experiment, the center frequency and the bandwidth change slightly observed from the S₁₁ curve of the stick antenna when the TVS is in parallel with the feed port.The TVS can restrain the voltage effectively and the peak voltage coupled by stick antenna can be kept to 6.8~7 V when two different models of TVS are in parallel with the feed port respectively.The results are coincidence with the theory, and are of certain guiding significance on the energy of lightning electromagnetic signals coupled by stick antenna.