Al-Zn-Mg-Cu　aluminum　alloys　have　the　advantages　of　high　specific　strength,　easy　processing,　and　high　toughness,　showing　great　potential　application　in　the　aerospace　field.　However,　ultra-high　strength　aluminum　alloys　usually　contain　coarse　microstructures,　micro-segregation,　and　casting　defects　that　seriously　deteriorate　mechanical　properties.　Here,　we　report　a　high-strength　aluminum　alloy　(Al-10.5Zn-2.0Mg-1.2Cu-0.12Zr-0.1Er)　prepared　by　rapid　solidification　and　hot　extrusion　to　explore　the　microstructure　modification　of　the　alloy　based　on　this　strategy.　The　results　show　that:　rapid-solidification　technology　can　significantly　refine　alloy　grains,　alloy　ribbons　were　composed　of　alpha　(Al)　equiaxed　fine　grains,　and　the　average　grain　size　was　less　than　6　mu　m.　After　extrusion,　the　alloy　had　partially　recrystallized,　existing　coarse　second-phase　(T-phase)　and　needle-shaped　precipitates　were　MgZn2　(eta-phase),　and　the　tensile　strength　and　elongation　of　the　extruded　bar　were　466.4　MPa　and　12.9%,　respectively.　After　T6　heat　treatment,　the　tensile　strength　of　the　alloy　reached　635.8　MPa,　while　elongation　decreased　to　10.5%.　According　to　microstructure　analysis　and　considering　the　contributions　of　grain　boundary,　dislocation,　and　precipitation-strengthening　to　the　improvement　of　the　mechanical　properties,　it　was　found　that　precipitation-strengthening　is　the　main　strengthening　mechanism.　Our　research　shows　that　rapid-solidification　and　hot-extrusion　technology　have　great　potential　for　improving　the　microstructures　and　mechanical　properties　of　aluminum　alloys.