Abstract: In order to study the terminal response characteristics of the twisted three-wire cable inside unmanned aerial vehicle(UAV) by strong electromagnetic pulse, a modeling method for the termination response of the twisted three-wire cable under strong electromagnetic pulse based on transmission line theory is proposed in this paper. Firstly, the physical structure of the triple helix of the stranded wire is determined, the parametric equations of the stranded wire bundle in the Cartesian coordinate system are given, and a model of the twisted three-wire cable with uniform twisting characteristics is established. The frequency domain equations of the terminal current of the triple stranded cable under field-to-wire are derived. The time domain solution is obtained by using the inverse fast Fourier transform and compared with the CST simulation results to verify the effectiveness of this algorithm. Finally, the coupling response law of the terminal response current with wire length, pitch, electromagnetic field polarization angle, orientation angle and pitch angle of the twisted three-wire cable is analyzed. The results show that the induced current of the twisted three-wire cable terminal increases with the increase of the wire length and pitch; the induced current increases and then decreases with the increase of the incident angle when the pitch and azimuth angle of the incident wave is in the range of \left 0,90\text° \right . The research results have important implications for improving the electromagnetic protection capability of UAV.