ZnO　is　one　of　potential　semiconductor　materials　in　photocatalytic　field,　and　appears　to　be　a　suitable　alternative　to　TiO2,　due　to　its　photochemical　properties　and　photodegradation　mechanism　similar　to　TiO2.　Graphene　is　a　single　2D　carbon　sheet　with　large　specific　surface　and　excellent　electric　conductivity.　The　combination　of　ZnO　and　graphene　could　extremely　improve　the　photocatalytic　activity　of　ZnO.　Herein　we　prepared　ZnO-graphene　nanocomposite　photocatalyst　using　graphite　and　ZnO　by　a　facile　one-step　hydrothermal　method.　During　the　hydrothermal　reactions,　both　of　the　reduction　of　graphene　oxide　and　loading　of　ZnO　were　occurred　simultaneously　and　the　desired　product　was　obtained.　The　as-prepared　ZnO-graphene　photocatalyst　exhibited　extraordinaire　photocatalytic　properties.　Results　of　photocatalytic　degradation　of　methyl　orange　show　that　the　photocatalysis　efficiency　of　the　composite　was　significant　enhanced,　compared　to　pure　ZnO.　This　work　could　provide　new　avenue　for　the　fabrication　of　ZnO-carbon　based　composites,　facilitating　their　application　in　pollutions　degradation　issues.