In　this　work,　WMo　nanopowders　were　prepared　by　sol-gel　synthesis　combined　with　hydrogen　reduction.　The　phase　distribution　of　the　powders　with　calcination　and　reduction　at　different　temperatures　was　analyzed　to　figure　out　the　effect　of　temperature　on　the　reaction　process.　The　calcined　powders　were　further　analyzed　by　thermogravimetric　analysis　(TGA)　and　differential　thermal　analysis　(DSC).　The　phase　composition,　grain　size　and　powder　morphology　of　the　resulted　WMo　nanoparticles　have　been　characterized　by　X-ray　diffraction　(XRD),　scanning　electron　microscope　(SEM),　energy　dispersive　spectrometer　(EDS)　and　transmission　electron　microscopy　(TEM).　The　precursor　calcined　at　450　degrees　C　consisted　of　W0.4Mo0.6O3　and　MoO3　phases　which　can　be　completely　reduced　to　be　pure　WMo　nanopowders　with　an　average　grain　size　of　20-40　nm　at　a　low　temperature　of　700　degrees　C　for　1　h.　The　grain　growth　characteristics　of　the　WMo　nanopowders　were　investigated　by　analyzing　the　compacts　annealed　at　temperatures　ranging　from　950　degrees　C　to　1400　degrees　C　for　different　time　periods.　The　grain　growth　mechanism　and　the　activation　energy　(Qg　=　220　+/-　21　kJ/mol)　of　WMo　nanoparticles　was　also　obtained.