The fretting corrosion behavior of the LGJ150/25 aluminium conductor steel reinforced（ACSR） conductor is investigated under industrial atmosphere corrosion condition and two different fretting amplitudes, based on the fretting abrasion/ fatigue testing equipment developed by the others. It is shown that the morphologies of the abrasion marks after fretting corrosion are basically similar to those after dry fretting wear, but there are corrosion products on the abrasion surfaces and corrosion holes along the edge of the abrasion marks. After fretting corrosion, the tensile strength of the Al strands decreases and the resistivity increases, so that damage of the conductor is more serious and becomes worse by increasing the fretting amplitude. Fracture of Al strands after fretting corrosion originates from the I and II-type fatigue cracks under the abrasion marks, which accelerates fretting corrosion via an electrochemical reaction and forms the corrosion holes. It possibly acts as the key factor of the fretting damage of ACSR conductor under atmospheric corrosion condition.