In　this　paper,　the　high-quality　[Ca24Al28O64]4+(4e-　)　(C12A7:e-　)　single　crystal　was　synthesized　by　xenon　lamp　melting　combined　with　Ti　vapor　treatment.　The　relative　density　of　the　sample　is　over　99.7%,　and　the　sample＇s　electron　density　is　1021　cm-3.　The　results　of　electron　emission　performance　show　that　the　sample＇s　emission　current　density　is　1.86　A/cm2　when　the　applied　voltage　is　3500　V　at　1100　degrees　C,　and　the　fluctuation　does　not　exceed　5%.　Theoretical　calculation　results　show　that　C12A7:e-　single　crystal　has　a　lower　work　function　(2.36　eV).　Also,　the　free　electrons　in　the　cage　cavity　are　mainly　distributed　around　the　frame　oxygen,　which　is　in　a　weakly　bound　state.　This　makes　C12A7:e-　single　crystal　have　excellent　electron　emission　characteristics.　Theoretical　calculations　provide　support　for　experiments.　These　laid　the　foundation　for　its　application　in　electron　emission.