The　effects　of　homogenization　heating　methods　on　microstructural　evolution　were　thoroughly　investigated　in　an　Al-Zn-Mg-Cu　alloy　containing　Cr,　Mn　and　Zr.　The　results　revealed　that　slow　heating　(SH),　rapid　heating　(RH)　and　two-step　heating　(SH300)　can　affect　both　the　types　and　contents　of　residual　phases　after　465　degrees　C/20　h.　The　SH　sample　exhibits　the　lowest　residual　phase　content　(primarily　Mg2Si　and　Fe-containing　phases),　while　the　RH　sample　shows　the　highest,　including　additional　0-Al2Cu　and　S-Al2CuMg　phases.　Heating　process　also　affects　Mg2Si　content,　with　RH　sample　showing　the　lowest.　Furthermore,　heating　process　significantly　influences　the　distribution　and　size　of　dispersoids,　including　E-Al18Mg3Cr2,　Al6Mn/Al6(Mn,　Fe)　and　L12-Al3Zr.　SH300　treatment　can　narrow　the　dispersoid　free　zones　(DFZs)　near　grain　boundaries.　Away　from　grain　boundaries,　E,　Al6Mn/　Al6(Mn,　Fe)　and　Al3Zr　phases　are　present　in　all　samples.　Among　these　dispersoids,　the　E　phase　is　least　sensitive　to　heating　method,　whereas　Al6Mn/Al6(Mn,　Fe)　coarsens　significantly　under　RH.　The　L12-Al3Zr　is　smallest　after　SH　treatment　but　coarsens　under　both　RH　and　SH300　conditions.　Additionally,　the　eta　phase　exhibits　a　significant　coexistence　relationship　specifically　with　the　E　phase,　which　remains　stable　even　after　465　degrees　C/20　h,　thereby　delaying　the　dissolution　of　eta.　Although　the　RH　sample　contains　the　highest　residual　phases,　coarse　dispersoids,　and　DFZs　within　the　grain　interiors,　this　only　results　in　a　slight　decrease　in　strength　and　has　no　detrimental　effect　on　elongation.　These　findings　elucidate　phase　transformations　under　varying　homogenization　heating　methods　and　provide　references　for　optimizing　mechanical　properties　in　Al-Zn-Mg-Cu　alloys.