Scandia　doped　dispenser　cathodes　were　prepared　by　powder　metallurgy　method　using　mixed　powder　of　scandia　doped　tungsten,　barium-calcium　aluminates　obtained　by　sol-gel　method.　The　scanning　electron　microscope　observation　results　indicate　that　the　cathode　has　submicron　quasi-spherical　tungsten　grains　structure　with　homogeneous　distribution　of　Sc2O3　and　barium-calcium　aluminates　which　dispersed　over　and　among　W　grains.　The　cathode　exhibits　good　emission　property,　i.e.　the　current　density　of　this　cathode　can　reach　more　than　40A/cm(2)　at　850　degrees　C-b.　The　cathode　has　low　work　function　of　1.43　eV.　Active　substance　of　Sc,　Ba　and　O　diffuse　from　the　inner　part　of　cathode　to　the　surface　to　form　a　Ba-Sc-O　multilayer　having　certain　ratios　of　Ba:Sc:O　which　contains　much　more　Ba　than　normal　dispenser　cathode　at　the　surface　of　Sc2O3-W　matrix　cathode　during　the　activation　period.　This　active-multi-layer　is　considered　to　be　responsible　for　copious　emission　capability.