The　isothermal　and　constant　strain　rate　compression　tests　of　3003　aluminum　alloy　were　conducted　in　the　strain　range　of　0.01-10.0　s-1　at　400°C　on　a　Gleeble-1500　thermal　simulator.　The　true　stress-true　strain　curves　were　obtained　in　the　tests.　The　results　show　that　the　actual　deformation　temperature　of　the　sample　deformed　at　higher　strain　rates　(ε̇≥1.0　s-1)　is　higher　than　the　preset　temperature,　resulting　in　a　deformation　thermal　effect.　The　critical　strain　of　dynamic　recrystallizaion　(DRX)　increases　with　strain　rate　increasing.　The　serrate　flow　curves　are　observed　at　the　higher　strain　rates　(ε̇≥1.0　s-1),　which　indicates　that　discontinuous　dynamic　recrystallization　(DDRX)　occurs.　Optical　microscope　and　transmission　electron　microscopy　were　employed　to　analyze　the　effect　of　strain　rate　on　the　microstructural　evolution.　The　results　show　that　lower　strain　rates,　more　easily　DRX　occurs.　Due　to　the　deformation　thermal　effect,　DRX　also　takes　place　in　the　studied　alloys　at　the　strain　rate　of　10.0　s-1.　The　grain　size　can　be　defined　obviously　with　strain　rates　increasing　at　the　strain　rate　higher　than　0.1　s-1.　Recrystallized　volume　fraction　decreases　with　strain　rate　increasing　at　the　same　strain.　Based　on　the　size　of　DRX　grain　and　uniformity　in　the　microstructure,　the　strain　rate　of　0.1　s-1　is　preferable　to　hot　working.