Isothermal　compression　tests　of　a　new　type　Al-Zn-Mg-Er-Zr　alloy　are　carried　out　on　a　Gleeble-3800　thermal　simulator　at　temperatures　varying　from　300　to　460　degrees　C　and　strain　rates　ranging　from　0.001　to　10　s(-1).　A　comprehensive　and　scientific　constitutive　models　based　on　the　Arrhenius　type　equation　have　been　developed　from　the　experimentally　measured　data.　The　deformation　temperature　and　strain　rate　have　significant　effect　on　flow　stress　and　the　material　constants,　such　as　alpha,　beta,　n,　In　A　and　Q　are　the　functions　of　the　strain.　The　flow　stress　calculated　by　the　developed　constitutive　equation　shows　a　close　agreement　with　the　experimental　value,　which　indicates　that　the　proposed　constitutive　equation　can　precisely　analyze　the　hot　deformation　behavior　of　the　Al-Zn-Mg-Er-Zr　alloy.　Due　to　the　presence　of　coherent　L1(2)-structured　Al-3(Er,Zr)　precipitates,　the　dominant　softening　mechanism　is　dynamic　recovery　during　isothermal　compression.　(C)　2015　Elsevier　B.V.　All　rights　reserved.