©,　2014,　Beijing　University　of　Technology.　All　right　reserved.　First-principles　density-functional　theory　calculations　are　perfomed　to　investigate　the　atomic　structures　and　electronic　properties　of　undoped　wurtzite　ZnO,　N,　Ag　single　doped　and　Ag-2N　codoped　ZnO,　respectively.　The　results　of　band　structure,　total　density　of　state,　partial　state　density　and　Mulliken　charge　are　obtained　and　analyzed.　Results　suggest　that　Ag-2N　codoped　ZnO　is　more　stable　by　efficiently　enhancing　the　dopant　solubility　and　thus　is　likely　to　yield　better　p-type　conductivity.