Abstract:Aimed at steep mountains with high altitude and heavy icing, the transmission line has some special problems, such as heavy load of earth wire, steep terrain, large size of tower, lack of tower legs, large amount of foundation project quantity and low efficiency of conventional construction methods. Combined with the rich experiences of Southwest Electric Power Design Institute in engineering design, from the comprehensive consideration of economy, reliability, feasibility and environmental protection in the full cycle, the innovation measures of transmission line structure are put forward, including three kinds of steel to extend the leg, three kinds of new tower type and two kinds of new foundation type.