Aluminum　alloy　3003　is　subjected　to　isothermal　compression　at　a　temperature　of　300　-　500A　degrees　C　and　deformation　rates　of　0.01　-　10.0　sec(-1)　in　a　Gleeble-1500　device　imitating　hot　compressive　deformation.　The　effects　of　the　temperature　and　of　the　deformation　rate　are　determined　in　terms　of　the　Zener　-　Hollomon　parameter　involving　the　Arrhenius　activation　factor.　The　influence　of　the　deformation　is　expressed　in　terms　of　a　constitutive　equation　allowing　for　the　effect　of　strain　on　different　constants　of　the　material.　The　method　of　strain　compensation　is　used　to　derive　a　modified　model　describing　the　relation　between　the　flow　stress,　the　strain　rate　and　the　temperature　for　the　alloy　at　high　temperatures.　The　stress　-　strain　curves　predicted　by　the　model　agree　well　with　experimental　data.