In　this　article,　Al-Cu-Mg-Ag　specimens　were　successfully　wire-arc-additive-manufactured　based　on　by　gas　metal　arc　process　to　investigate　the　evolution　of　microstructure　and　mechanical　properties.　The　results　showed　that　the　grain　morphology　and　pore　size　in　the　printed　specimens　varied　in　height　direction.　Under　the　influence　of　repeated　thermal　cycling,　which　affected　the　solid-state　diffusion　of　the　deviated　elements　at　the　grain　boundaries,　the　distribution　of　the　nanoscale　second　phase　appeared　significantly　different　in　the　height　direction.　The　precipitation　phase　changes　caused　the　microhardness　of　the　printed　specimens　to　decrease　gradually　from　a　peak　of　125　HV　and　stabilise　at　around　100　HV.　The　changes　in　the　printed　specimens＇　horizontal　mechanical　properties　were　insignificant　mainly　due　to　interlayer　porosity.