The　rare　earth　oxides　(REO)　doped　molybdenum　powder　was　prepared　by　solid-solid　doping,　solid-liquid　doping　and　liquid-liquid　doping,　respectively;　afterwards,　the　powder　was　sintered　by　spark　plasma　sintering　and　traditional　sintering　combined　with　cold　isostatic　compaction　method　for　fabricating　REO-Mo　cermet　cathodes.　OM　and　emission　property　tests　were　used　to　research　the　microstructure　and　the　secondary　electron　emission　properties　of　the　samples.　The　results　show　that　the　emission　properties　of　the　material　can　be　enhanced　through　the　uniform　distribution　of　rare　earth　oxides　and　the　refinement　of　structure.　The　activation　temperature　can　be　decreased　greatly　by　annealing　in　hydrogen　at　high　temperature,　and　the　secondary　emission　yield　is　also　enhanced　apparently.