Isothermal　and　constant　strain　rate　compression　tests　of　3003　aluminum　alloy　prepared　by　high-efficient　melt-treatment　were　conducted　in　the　range　of　300-500°C　and　0.01-10.0　s-1　on　a　Gleeble-1500　thermal　simulator.　The　processing　map　was　created　based　on　the　dynamic　materials　model　(DMM).　Combined　with　the　hot　deformation　microstructure　observation　by　OM　and　TEM,　the　hot　deformation　mechanism　map　of　the　3003　aluminum　alloy　was　established.　The　results　show　that　the　flow　instable　zones　can　be　determined　by　the　maps　and　the　analysis　of　the　microstructure,　which　are　corresponding　to　hot　deformation　temperature　of　300-380°C　and　strain　rate　around　1.0-10.0　s-1.　The　optimal　hot　processing　parameters　of　hot　deformation　under　the　test　condition　are　obtained　by　the　maps　as　follows:　hot　deformation　temperature　of　380-430°C　and　strain　rate　around　1.0-10.0　s-1,　where　the　material　mainly　under　goes　dynamic　recrystallization　(DRX).