Femtosecond　laser　processing　technology　has　been　used　to　achieve　controlled　processing　of　microtips　array　on　the　surface　of　polycrystalline　LaB6　blocks.　Under　the　condition　of　ensuring　the　integrity　of　the　geometric　morphology　of　the　tips　array,　the　tips　with　a　height　of　10　mu　m　and　a　radius　of　curvature　of　1　mu　m　can　be　processed.　The　distribution　of　tips　in　the　array　is　uniform,　the　morphology　is　complete,　the　crystal　structure　and　physical　phase　of　LaB6　have　not　changed　after　processing,　which　breaks　through　the　technical　problems　of　difficult　processing　and　poor　geometry　consistency　about　polycrystalline　rare-earth　hexaboride　tips　emitter,　and　the　processing　area　is　no　longer　limited　by　the　small　size　of　single　crystals.　The　field　emission　performance　test　indicated　that　the　turn-on　electric　field　is　2.8　V/mu　m,　and　the　current　density　is　467.9　mA/cm(2)　when　the　applied　electric　field　reached　9.4　V/mu　m.