ZnO　buffer　layer　was　deposited　on　ITO　electrodes　coated　the　glass　substrate　by　magnetic　sputtering　and　one-dimensional　ZnO　nanomaterials　were　grown　on　ITO　elelctrodes　by　a　simple　thermal　evaporation　approach.　The　structure　and　morphology　of　these　samples　characterized　by　XRD　and　SEM.　The　field　emission　characteristics　were　also　investigated.　SEM　images　revealed　that　these　synthesized　ZnO　nanonails　vertically　grown　on　the　substrate　are　composed　of　a　large　of　caps　with　the　diameter　of　several　microns　and　shafts　with　the　diameter　of　several　hundreds　nanometer.　The　field　emission　properties　show　that　ZnO　nanonails　have　low　turn-on　filed,　high　field　emission　current　and　good　stability,　which　indicated　that　is　a　promising　candidate　for　field　emission　source　as　cold　cathode.