The wall of ZL205A aluminum alloy were carried out by the wire+arc additive manufacturing technology (WAAM). The microstructure,mechanical properties and so on of ZL205A aluminium alloy wall were investigated by metallographic, SEM, EDS and tensile tests, and compared with that of metal casting alloy. The results show that the thickness of the wall is uniform and the surface is smooth. Meanwhile, the burning rates of B and Cd inStheSdepositSbody are 60% and 50%, respectively. Compared with cast alloys at casting condition, the as-deposited WAAM ZL205A have more uniform grain size, smaller grain size and uniform distribution of precipitated phases in grain and grain boundaries. After heat treatment (T6), θ-phase is completely dissolved into Al matrix, and the re-melted T-phase distributes on the grain boundary. The tensile strength, yield strength and elongation of the wall are 500 Mpa, 450 Mpa and 10%, respectively, which are higher than that of the metal casting alloy, and the mechanical properties of the alloy in transverse and longitudinal directions are the same.