High　purity　and　high　density　La1-xNdxB6　bulks　were　prepared　by　using　evaporation　condensation　combined　spark　plasma　sintering　(SPS)　with　high-purity　metal　La,　Nd　bulks　and　B　powder　as　raw　materials.　Phase　component,　the　mechanical　properties,　the　resistivity　and　the　thermionic　emission　properties　of　La1-xNdxB6　bulks　were　investigated　systematically.　The　results　show　that　high　purity　and　high　density　La1-xNdxB6　single-phase　bulk　material　can　be　prepared　by　using　the　above　mentioned　technology.　The　sintered　samples　show　high　value　of　Vickers　hardness　(26.70　GPa)　and　bending　strength　(230.48　MPa).　According　to　the　thermionic　emission　results,　the　bulk　of　La0.1Nd0.9B6　materials　exhibits　optimum　thermal　emission　properties,　the　emission　current　density　is　32.04　A/cm(2)　and　zero　field　current　density　reaches　12.72　A/cm(2)　at　the　temperature　of　1600　degrees　C　and　the　applied　voltage　of　4　kV,　which　is　better　than　LaB6　and　NdB6　bulk　samples　under　the　same　conditions.　It　is　shown　that　proper　Nd　content　is　benefit　to　reducing　the　work　function　and　improving　the　thermionic　emission　properties,　the　average　of　effective　work　function　for　La0.1Nd0.9B6　at　different　temperatures　is　2.72　eV.