ER5356,　ER2319,　and　Zn　welding　wires　were　synchronously　fed　by　a　GTAW　wire　+　arc　additive　manufacturing　(WAAM)　system,　and　the　microstructure　and　mechanical　properties　of　the　deposited　Al-Zn-Mg-Cu　aluminum　alloy　components　were　investigated.　The　results　showed　that　the　phase　composition　of　WAAM　7050　alloy　is　mainly　composed　of　α-Al,　S　(Al2CuMg),　η　(MgZn2),　and　θ　(CuAl2)　phases.　The　composition　of　each　element　is　in　accordance　with　the　intended　design　and　the　specifications　of　the　7050　aluminum　alloy　composition.　The　lower　portion　of　each　deposited　layer　is　mainly　composed　of　columnar　crystals,　and　the　upper　portion　exhibits　an　equiaxed　crystal　structure.　A　small　number　of　defects,　such　as　pores　and　microcracks,　were　observed　in　the　interlayer.　The　average　hardness　of　the　components　was　106　HV;　the　tensile　strength　is　241　MPa　in　the　horizontal　direction　and　160　MPa　in　the　vertical　direction.　The　fractographs　exhibited　typical　brittle　fracture　characteristics.　The　reasons　for　the　anisotropy　of　its　mechanical　properties　were　explained　in　detail.　©　2020　The　Society　of　Manufacturing　Engineers