Abstract: This paper focuses on the wind deflection safety issue of 500kV transmission lines under strong wind conditions. Based on the tower-line system coupling finite element model, the research conducts an analysis of dynamic clearance and safety margin under wind deflection. By establishing a refined "two-tower three-line" model and using the linear filtering method to simulate the fluctuating wind load, the dynamic minimum electrical clearance between the conductors and key nodes of the tower under different wind speeds is analyzed. The research results show that the wind deflection displacement of the conductor increases slowly at first and then rapidly with the increase of wind speed, and the minimum electrical clearance shows a monotonically decreasing trend. Within the wind speed range of 10 to 30 m/s, the minimum clearance is always higher than the safety threshold required by the specification. This study provides a new method for quantitatively judging the safety of wind deflection and simultaneously verifies that the wind deflection flashover risk of this line under strong wind conditions is low, offering a reliable theoretical basis and evaluation method for the wind-resistant design of transmission lines.