Al-Mg-Zn-Er-Zr　alloy　was　compressed　in　tem-perature　range　from　300　to　500　℃　to　investigate　the　microstructure　evolution.Molecular　dynamics　simulations　were　used　to　study　the　mechanical　behavior　and　dislocation　evolution.The　results　showed　that　mobile　dislocations　are　widely　distributed　in　alloys　and　make　important　contribu-tions　to　coordinate　compressive　deformation.The　sessile　dislocations　hinder　the　deformation,and　the　content　is　about　1/20　of　that　of　mobile　dislocations.Continuous　dynamic　recrystallization(CDRX)is　considered　to　be　the　main　recrystallization　mechanism.The　accumulation　of　dislocations　can　provide　element　diffusion　channels　and　driving　force　for　τ(Mg32[Al,Zn]49)phase　precipitation,resulting　in　the　forced　precipitation　of　discontinuous　T　phase　to　replace　the　continuousβ　phase(Al3Mg2),which　reduces　the　corrosion　potential,resulting　in　increased　corrosion　resistance.