Replacing　the　expensive　Sc　in　thermionic　cathode　with　cheaper　Y　has　come　to　be　a　widespread　concern,　but　has　no　substantial　breakthrough　so　far　in　previous　studies.　In　this　paper,　several　co-doped　tungsten　matrix　cathodes　with　different　weight　ratio　of　Y2O3:Sc2O3　were　prepared　and　tested.　The　results　indicate　that　addition　of　Y　can　enhance　the　emission　performance　of　cathodes　in　some　specific　component　ratios　of　Y　to　Sc.　However,　the　surface　analysis　indicates　that　the　added　Y　are　not　working　as　adsorption　Y　to　adjust　the　chemical　potential　of　O　and　Ba　on　the　surface　of　cathode　like　Scandium,　but　just　promote　the　generation　of　Sc.　©　2022　IEEE.