Abstract: Hot-rolled equilateral angle steel is the main raw material for transmission towers. This paper lists the typical quality problems and insufficient standards of angle steel in the application of transmission towers, summarizes the application technology characteristics of angle steel for transmission towers, reviews the process of standard revision for hot-rolled angle steel products, analyzes the technological progress of angle steel smelting and hot rolling, summarizes the basis and principles for standard formulation and revision of hot-rolled angle steel for transmission towers at current stage. This paper focuses on the technical characteristics, practical achievements and engineering applications of the group standard T/TEC 352—2020 "hot-rolled equilateral angle steel for transmission line towers", and the positive impact on the industrial standardization of national standards for angle steel and section steel in China.