A　composite　material　of　Zinc　oxide　and　carbon　nano-tubes　(ZnO-CNTs)　paste　was　synthesized　by　mixing　multi-wall　CNTs,　ZnO　nano-grains　and　organic　vehicles.　The　microstructures　and　the　morphologies　of　screen-printed　films　were　characterized　by　field-emission　scanning　electron　microscope.　Results　show　that　ZnO　flakes　geometrically　matched　with　CNTs　by　filling　into　the　interspaces　of　CNTs　or　directly　covering　upon　CNTs.　The　field　emission　characteristics　of　films　are　found　to　be　greatly　effected　by　ZnO　nano-grains.　Especially,　the　turn-on　electric　field　of　ZnO-CNT　film　(1.17　V/mu　m)　which　is　far　lower　than　that　of　usual　CNT　films　(1.70　V/mu　m).　Furthermore,　except　that　better　emission　stability　is　achieved,　brightness　and　emission　uniformity　are　notably　enhanced　as　well.　It　can　be　speculated　that　the　special　microstructures　of　ZnO　mixed　CNT　films　dominate　the　enhanced　electrical　conductivity,　thermal　conductivity,　and　effective　emitters.　(C)　2007　Elsevier　B.V.　All　rights　reserved.