The　hot　deformation　behavior　of　Al-4.7Mg-0.7Mn-0.1Zr-0.4Er　alloy　was　investigated.　Compression　tests　were　performed　on　a　Gleeble　1500D　thermal　simulator　system　in　the　temperature　range　of　300-500°C　and　strain　rates　of　0.001-10　s-1　with　a　total　strain　of　0.7.The　flow　curves　exhibite　steady　state　flow　behavior　at　temperature　higher　than　400°C,　and　at　other　temperatures　the　alloy　is　characterized　by　strain　hardening.　The　processing　map　was　created　based　on　the　dynamic　materials　model　and　it　predicts　that　the　dynamic　recovery　of　the　alloy　mainly　occurs　in　a　region　with　temperature　of　400-500°C　and　stain　rates　of　0.001-0.1　s-1.　The　corresponding　apparent　activation　energy　estimated　in　the　region　is　176　kJ/mol,　which　is　higher　than　that　for　self-diffusion　in　pure　aluminum,　suggesting　that　cross-slip　of　dislocations　is　the　deformation　mechanism.　The　flow　instable　region　reveals　local　deformation　feature.