The　isothermal　and　constant　strain　rate　compression　tests　of　3003　aluminum　alloys　were　conducted　in　the　range　of　300~500°C　and　0.01~10.0　s-1　by　Gleeble-1500　thermal　simulator.　The　plot　of　average　recrystallization　grain　size,　temperature　and　strain　rate　was　built.　The　microhardness　decreases　with　the　strain　rate　and　temperature　increasing;　furthermore　the　microhardness　increases　with　the　average　recrystallization　grain　size　decreasing.　It　is　indicated　by　TEM　images　that　the　large　and　diffused　precipitated　phases　AlMnFe　and　AlMnSi　are　distributed　unevenly　in　the　aluminum　matrix　in　the　conditions　of　T≥400°C　and　Ε≥1.0　s-1,　which　play　a　role　of　particle　stimulation　on　the　nucleation　(PSN)　during　the　process　of　dynamic　recrystallization　(DRX).　It　is　found　that　the　microhardness　changes　are　in　good　agreement　with　the　results　of　microstructure　observation.