Abstract: This paper is based on the background of towers collapsing accidents of overhead transmission lines during "CaiHong" typhoon. The criterion on design reviewing of existing towers is discussed, and the wind load acting on the damage towers of the 220 kV overhead transmission line from typhoon attacking is calculated, as well as the reason for the tower collapsing was analyzed. Finally, some conclusions and suggestions are proposed to enhance design standards and tower strength on the coastal zones where typhoons landing always recur.