With the scale of transmission lines expands,the risk of lightning is increasing,and the lightning accidents have been increasing in recent years.By analyzing the influence of grounding resistance,the height and gear distance of towers as well as the phase-sequence arrangement of wires and other factors on the lightning resistance level of high-voltage transmission lines combined with the characteristics of different areas,the differentiated lightning protection measures are put forward,which reduces the cost of power construction and operation while ensuring the lightning protection effects.