Al-Mg-Zn-Er-Zr　alloy　was　compressed　in　temperature　range　from　300　to　500　degrees　C　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　contributions　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　tau　(Mg-32[Al,　Zn](49))　phase　precipitation,　resulting　in　the　forced　precipitation　of　discontinuous　tau　phase　to　replace　the　continuous　b　phase　(Al3Mg2),　which　reduces　the　corrosion　potential,　resulting　in　increased　corrosion　resistance.