In　order　to　obtain　suitable　homogeneous　annealing　process　for　high　zinc　and　ultra-high　strength　aluminum　alloy,　the　effects　of　two-step　homogenization　annealing　process　on　microstructure　and　mechanical　properties　were　studied　by　optical　microscopy　(OM),　differential　scanning　calorimetry　(DSC),　scanning　electron　microscopy　(SEM)　and　energy　dispersive　spectroscopy　(EDS).　The　results　show　that　the　overheating　temperature　of　the　alloy　homogenized　at　400°C　for　4　h　is　471°C;　the　best　two-step　homogenization　process　of　the　alloy　after　T6　artificial　aging(120°C　for　24　h)is　firstly　heated　at　400°C　for　4　h,　and　then　heated　at　467°C　for　30　h.　After　annealing　by　the　two-step　homogenizing　process,　element　segregation　in　the　ingot　alloy　is　obviously　eliminated,　and　eutectic　phase　decreases　significantly,　and　precipitated　phase　of　as-extruded　alloy　is　relatively　small　and　distributed　evenly,　the　mechanical　properties　of　the　alloy　can　be　improved　significantly.