Abstract: Application technology of aluminum alloy core fixed laying cables in wind turbine tower has developed maturely.In order to furtherly meet the market demand, aluminum alloy core flexible cables was designed to replace the copper core torsion resistant cables at the upper end of the tower.The reliability of the cable was verified by torsion test.The results showed that wire breaking rate of aluminum alloy flexible conductor after torsion was related to torsion length, torsion angle, conductor structure and non-metallic materials; after optimization design, broken wire rate of aluminum alloy flexible conductor after torsion was reduced to the minimum, meeting the users' needs, and verifying the feasibility of replacing copper with aluminum for torsion resistant cables used in wind power generation.