As-cast　microstructure　features　of　Al　sheet　for　manufacturing　a　pressure　can　with　high　formability　prepared　by　different　melt-treatment　technology　were　observed　by　SEM　(scanning　electron　microscope),　EDAX,　TEM　(transmission　electron　microscope)　and　SAED　(selected　area　electron　diffraction).　The　results　reveal　that　oxide　inclusions　in　the　Al　sheet　are　mainly　γ-Al2O　3　phase,　and　Fe-rich　impurity　phases　in　the　Al　sheet　are　mainly　Al3Fe,　Tl(Al12Fe3Si)　and　AlFeSiRE　phase,　in　which　AlFeSiRE　phase　exhibits　complicated　non-determined　structure.　Melt-treatment　technologies　exhibit　remarkable　effects　on　microstructure　of　ascast　aluminum　sheet.　There　exists　much　oxide　inclusion　with　large　size　approximately　10-40　μin　diameters,　non-uniform　distribution　is　gathered　together　in　the　large　block　form,　and　Al3Fe　phase,　and　Tl　phase　as　well　as　a　little　metastable　phase　Al6Fe　phase　exhibits　coarse　acicular　structure　or　skeleton　structure　in　the　conventional　treatment　or　treated-free　aluminum　sheet,　furthermore,　the　oxide　inclusion　is　easy　to　aggregate　with　Fe-rich　phases.　While　in　high　efficiency　melt-treatment　aluminum　sheet,　there　exists　a　little　oxide　inclusion　with　uniformly　dispersive　distribution　and　fine　size　less　than　4μm,　and　Re-rich　phases　are　mainly　AlFeSiRE　phase　and　little　Al3Fe　phase,　in　which　AlFeSiRE　phase　exhibits　fine　spheroidal　structure　with　size　less　than　0.　5μm　or　short　rod　structure　distributing　along　grain.　In　addition,　the　absence　of　phenomenon　of　Fe-rich　phases　gathering　together　with　oxide　inclusions　can　be　observed.