As　the　primary　candidate　material　for　plasma　facing　components　(PFCs)　in　fusion　reactor,　the　serious　brittleness　of　tungsten　has　become　an　urgent　issue　to　be　solved.　In　this　work,　a　multi-doped　W-Hf-Y2O3　2　O　3　alloy　was　prepared　by　high-energy　ball　milling　and　spark　plasma　sintering,　aiming　at　improving　its　toughness　through　formation　of　complex　oxide　particles.　Complex　Y2Hf2O7　2　Hf　2　O　7　with　pyrochlore　structure　were　developed　in　the　multi-doped　WHY　alloy　due　to　dissolution　and　precipitation　mechanism,　which　was　confirmed　by　the　combined　characterization　results　of　X-ray　diffraction　(XRD),　electron　probe　microanalysis　(EPMA)　and　transmission　electron　microscope　(TEM).　Complex　oxide　particles　of　Y2Hf2O7　2　Hf　2　O　7　with　average　size　of　38.8　nm　were　densely　distributed　in　the　alloy.　The　formation　of　complex　Y2Hf2O7　2　Hf　2　O　7　particles　with　nano-scale　size　not　only　consumed　the　impurity　of　oxygen,　but　also　played　a　critical　role　in　grain　refinement　because　of　Zener　pinning　effect.　Improvement　in　mechanical　properties　of　the　multi-doped　WHY　alloy　was　then　achieved,　and　the　fracture　toughness　and　compressive　strength　reached　19.7　MPa　center　dot　m1/2　center　dot　m　1/2　and　2223.4　MPa,　respectively.