The　flow　stress　behavior　of　Al-0.3Er　have　been　studied　by　hot　compression　tests　on　a　Gleeble-1500D　thermal　simulator　in　the　temperature　range　of　300-450　degrees　C　and　strain　rate　range　of　0.001-10　s(-1).　The　results　show　that　the　flow　stress　is　controlled　by　strain　rate　and　deformation　temperature.　The　flow　stress　decreases　with　deformation　temperature　increasing　and　increases　with　strain　rate　increasing.　The　constitutive　relation　of　Al-0.3Er　under　high　temperature　conditions　can　be　described　by　hyperbolic-sine-type　equation.　The　processing　maps　based　on　the　dynamic　material　model　(DMM)　of　Al-0.3Er　alloy　has　been　also　established　and　analyzed　preliminarily.　The　highest　efficiency　of　power　dissipation　is　at　the　temperature　range　of　415-450　degrees　C　and　in　the　strain　rate　range　of　0.001-0.076　s(-1)　and　0.347-0.390　s(-1),　which　is　optimum　working　domain.