This　paper　presented　a　novel　post-treatment　method　of　high　pressure　airflow　with　organic　solvent,　which　could　effectively　improve　the　field　emission　characteristics　of　screen-printed　CNT　cathodes.　Notable　changes　in　the　surface　morphologies　of　screen-printed　CNT　cathodes　were　investigated　by　stylus　profiler,　scanning　electron　microscope　(SEM)　and　transmission　electron　microscope　(TEM)　as　the　function　of　treatment　by　high　pressure　airflow　with　organic　solvent.　The　results　showed　the　post-treated　CNT　cathodes　hold　lower　turn-on　electric　field,　higher　field　emission　current　density,　more　emission　sites,　and　better　uniformity　than　those　of　untreated　ones.　It　was　also　found　that　the　ratio　of　electric　field　enhancement　factor　for　untreated　and　treated　CNT　cathodes　was　1　to　2.8.　And　it　was　proved　that　the　field　emission　properties　had　been　improved　evidently,　for　removal　of　residual　materials　covered　on　the　surface　of　CNTs.