Steel-core aluminum alloy conductors are particularly suitable for applications in large spans, high-drop mountainous areas, river valleys, etc.; ultra-high-strength steel-core aluminum alloy stranded wires are conductor products for special geographical conditions such as crossing large rivers. During the reconstruction of urban and rural lines, the line corridors are narrow, so steel core-reinforced aluminum alloy conductors are used to increase the distance between poles and towers to ensure electrical safety when lines are erected cross-wise, across bridges, and across highways. Steel-core aluminum alloy stranded wire, the conductive material is a high-strength aluminum-magnesium-silicon alloy unit, the strength is generally above 315MPa, and the conductivity is not less than 52.5% IACS. According to the design needs, high-strength galvanized steel strands are used, especially the use of Category 5 ultra-high-strength steel wires (strength up to 1800MPa), so that the rated breaking force of the conductors is extremely high and the line safety factor is increased.