Comparing with common aluminium conductor steel reinforced (ACSR) with equal outside diameter, the DC resistance of energy-saving conductor is lower, so applying it in transmission lines can enhance conductivity and decrease line losses. This paper introduces electrical characteristics, mechanical characteristics, construction installation, line's cost analysis as well as annual cost, and other conditions of the energy-saving conductor and common aluminium conductor steel reinforced. A general method of selecting energy-saving conductors is proposed binding with the project.