The　magnetic　and　optical　properties　of　Fe-doped　pentra-ZnO2　monolayer　with　different　concentrations　were　studied　by　first-principles　calculations.　The　results　show　that　the　absorption　edge　of　the　base　material　is　red　shifted　obviously　and　the　absorption　intensity　in　the　range　of　visible　light　is　greatly　improved　by　Fe　doping.　When　two　Fe　atoms　substitute　two　Zn　dopants,　they　tend　to　form　a　cluster　and　ferromagnetic　order　becomes　energetically　more　favorable.　Heisenberg　mean　field　model　calculations　show　that　the　Curie　temperature　of　the　ferromagnetic　phase　is　much　higher　than　room　temperature,　indicating　Fe-doped　pentra-ZnO2　is　an　excellent　room　temperature　dilute　magnetic　semiconductor.