Abstract: The original topography of transmission lines is greatly affected and changed by human engineering activities, and the stability of tower sites also changes with the influence of these activities. The slopes at tower sites often experience geological disasters such as landslides due to improper excavation, which affects the safe and stable operation of transmission lines. Taking Tower N036 of a 220kV transmission line project as an example, this paper uses Midas GTS/NX geotechnical finite element analysis software to conduct comprehensive simulation and analysis of the stability of the N036 tower site in terms of slope stability, potential sliding surfaces, and the impact of the slope on the tower foundation. Based on the simulation results, specific and effective recommendations are provided for tower foundation treatment and support.