First-principles　density-functional　calculation　has　been　performed　to　investigate　the　synergistic　effects　of　N　and　F　doping　on　the　photocatalytic　properties　of　Zn2GeO4.　Our　results　indicate　that　the　presence　of　F　facilitates　the　introduction　of　N　by　reducing　the　formation　energy　significantly.　As　N　and　F　is　codoped　into　Zn2GeO4,　the　mobility　of　the　charge　carriers　is　more　rapid　due　to　the　dispersive　levels　above　the　valence　band.　And　with　the　narrowed　band　gap　the　optical　absorption　spectrum　red-shifts　into　the　ideal　visible-light　region.　Thus,　we　propose　that　the　codoping　of　N　and　F　can　be　a　promising　strategy　to　promote　the　photocatalytic　performances　of　Zn2GeO4　under　visible　light.　©　the　Owner　Societies　2015.