The　MgO　nanowires　were　synthesized　by　carbon　thermal　reduction-oxidation,　and　their　morphologies　and　crystal　structural　were　measured　by　SEM　(scanning　electron　microscopy)　and　XRD　(X-ray　diffraction).　Then　the　MgO　nanowires　were　transferred　to　the　cathode　electrode　by　printing,　and　the　cathode　were　assembled　with　phosphor　powder　coated　anode.　The　field　emission　(FE)　measurement　shows　that　the　MgO　nanowires　possess　high　electron　emission　properties,　that　its　threshold　voltage　was　only　1.3V/μm(1mA/cm2)　and　its　emission　currents　density　can　reach　2.68mA/cm2　at　electric　field　of　4.01V/μm.　It　has　a　luminance　with　1152cd/m2　without　reduction　in　4h.　These　results　suggest　that　the　MgO　nanowire　can　be　an　excellent　FE　material　candidate.