Abstract: The performance of overhead conductors will change due to thermal effect caused by self-resistance in the long-term and long-distance transmission of electricity. The industrial pure aluminum wires for overhead transmission lines were annealed at different temperatures to simulate the service states and the yield strength-conductivity relation of them were presented compared with that of the drawn industrial pure aluminum wires. The results show that yield strength was in inverse ratio to conductivity of both annealed and drawn industrial pure aluminum wires. The yield strength-conductivity curves of annealed industrial pure aluminum wires were all above that of drawn state samples, the equilibrium high-angle grain boundary formed after annealing was the main reason leading to high strength and high conductivity of industrial pure aluminum wires.