The　flow　stress　feature　of　aluminum　sheet　used　for　pressure　can　during　plastic　deformation　at　elevated　temperature　was　studied　by　isothermal　compression　test　using　Gleeble　1　500　dynamic　materials　testing　machine.　The　experimental　results　show　that　the　steady　state　deformation　is　remarkable　when　the　material　is　deformed　in　the　temperature　range　of　350-500°　at　strain　rates　within　the　range　of　10-2-10.0s-1.　The　material　is　sensitive　to　positive　strain　rate.　A　hyperbolic　sine　relationship　is　found　to　correlate　well　the　flow　stress　with　the　strain　rate,　and　an　Arrhenius　relationship　with　the　temperature.　Semi-empirical　constitutive　equations　of　the　flow　stress　are　derived　from　all　experimental　data　for　tested　material　during　plastic　deformation　at　elevated　temperature　by　polyelement　linear　regression　analysis.