A　novel　technique　was　developed　to　considerably　improve　the　field　emission　characteristics　of　the　carbon　nano-tubes　(CNTs).　In　the　newly-developed　technique,　the　purified,　de-bundled,　and　sintered　CNTs　were　exposed　to　the　magnetic　field　(0.5　T)　for　4　h.　The　microstructures　and　emission　properties　of　the　CNTs　were　characterized　with　scanning　electron　microscopy,　and　field　emission　probe.　The　results　show　that　the　exposure　to　magnetic　field　significantly　enhanced　the　field　emission　characteristics.　For　example,　its　onset　field　was　found　to　drop　from　1.05　to　0.73　V/μm;　its　emission　current　density　increased　up　to　0.1　mA/cm2;　and　its　fie　ld　enhancement　factor　increased　from　1656　to　2045.　In　addition,　when　it　comes　to　the　emission　uniformity,　the　CNTs,　exposed　to　the　magnetic　field,　outperforms　the　control　sample.　Possible　mechanisms　responsible　for　the　enhancement　were　also　tentatively　discussed.