Scandia　and　rhenium　doped　tungsten　powders　were　prepared　by　solid-liquid　doping　combined　with　two-step　reduction　method.　The　experimental　results　show　that　scandia　was　distributed　evenly　on　the　surface　of　tungsten　particles.　The　addition　of　scandia　and　rhenium　could　decrease　the　particle　size　of　doped　tungsten,　for　example,　the　tungsten　powders　doped　with　SC2O3　and　Re　had　the　average　size　of　about　50　nm　in　diameter.　By　using　this　kind　of　powder,　scandia　and　rhenium　doped　tungsten　matrix　with　the　sub-micrometer　sized　tungsten　grains　was　obtained.　This　kind　of　matrix　exhibited　good　anti-bombardment　insensitivity　at　high　temperature.　The　emission　property　result　showed　that　high　space　charge　limited　current　densities　of　more　than　60　A/cm(2)　at　900　degrees　C　could　be　obtained　for　this　cathode.　A　Ba-Sc-O　multilayer　about　100　urn　in　thickness　formed　at　the　surface　of　cathode　after　activation　led　to　the　high　emission　property.　(c)　2007　Elsevier　Masson　SAS.　All　rights　reserved.