The　C12A7:e-　+　LaB6　mixed　powder　was　used　as　the　precursor,　and　high-quality　C12A7:e-　+　LaB6　composite　ceramic　blocks　were　synthesized　by　spark　plasma　sintering　(SPS)　at　1200　?C,　50　MPa,　and　20　min.　The　relative　density　of　the　sample　reaches　99.6%.　C12A7:e-　and　LaB6　phases　coexist　with　a　size　of　0.1-10　mu　m　and　are　relatively　uniformly　distributed　in　the　sample.　The　current　emission　density　of　the　sample　reaches　2.92　A/cm(2),　the　zero-field　emission　current　density　reaches　2.39　A/cm(2),　and　the　effective　work　function　reaches　2.17　eV　when　the　anode　voltage　is　4000　V,　and　the　temperature　is　1200　?C.　Also,　no　melting　phenomenon　appeared　in　the　samples,　and　the　bulk　had　excellent　emission　stability　during　emission　performance　testing.　These　results　provide　a　new　idea　for　solving　the　melting　phenomenon　of　C12A7:e-　in　high-temperature　cyclic　ignition.　This　provides　the　basis　for　the　practical　application　of　C12A7:e-　in　electron　emission　and　vacuum　electronic　technology.