The　paper　describes　the　preparation　and　emission　property　of　scandia　and　Re　doped　tungsten　matrix　impregnated　cathode.　By　an　easy　and　reproducible　way,　solid-liquid　doping　combined　with　two-step　reduction,　powders　of　tungsten　particles　covered　with　scandium　oxide　were　obtained.　Compared　with　scandia　mixed　tungsten　powders　prepared　by　mechanically　mixing,　scandia　and　rhenium　doped　tungsten　powders　had　smaller　particle　size,　for　example,　scandia　(3　wt%)　and　Re　(5　wt%)　doped　tungsten　powders　had　the　average　size　of　about　50　nm　in　diameter.　Based　on　this　kind　of　powder,　scandia　and　Re　doped　tungsten　matrix　with　the　sub-micrometer　sized　tungsten　grains　and　a　more　uniform　distribution　of　Sc2O3　were　obtained　in　this　paper.　Scandia　and　Re　doped　tungsten　matrix　impregnated　cathode　had　shown　excellent　emission　property　and　good　emission　uniformity.　The　space　charge　limited　current　densities　of　more　than　58A/cm(2)　at　900　degrees　C-b　could　be　obtained　and　the　work　function　of　this　cathode　was　as　low　as　1.18　eV.　(c)　2007　Elsevier　Ltd.　All　rights　reserved.