Carbon　fibers　(CNFs)　were　surfacial　metallized　by　electroless　deposited　with　copper,　and　their　field　emission　properties　were　investigated　by　diode　test.　The　results　indicated　that　the　field　emission　properties　of　CNFs　were　affected　by　the　thicknesses　of　copper.　After　CNFs　were　surfacial　metallized,　the　volume　resistivity　of　CNFs　was　decreased　and　field　emission　property　was　increased,　respectively;　increase　the　thin-film　thickness,　there　appeared　an　optimal　film　thickness　value　for　properties　of　field　electron　emission.　It　was　found　that　CNFs　owned　the　best　field　emission　properties　after　electroless　depositing　for　15　min,　with　copper　metal　thickness　as　2.1　mu　m　and　the　volume　resistivity　down　to　2.35x10(-4)　Omega.cm.　The　field　emission　tests　showed　when　applied　voltage　was　562　V,　CNFs　appeared　bright　dots,　and　the　high　luminance　achieved　1388　cd/m(2)　under　applied　voltage　1013　V.　Further　more　theoretical　analyses,　copper　coating　on　CNFs　surface　is　attributed　to　good　electric　conductivity,　the　low　work　function　and　the　lower　attenuation　of　electron　scattering　in　thin-film.