Nb3Sn　has　good　superconducting　properties　in　the　background　magnetic　field　above　10　T,　Nb3Sn　superconducting　joints　in　high　field　magnet　equipment　can　be　connected　with　Nb3Sn　superconducting　bulks.　By　fabricating　different　powder　metallurgy　Nb3Sn　superconducting　bulks,　the　effects　of　pressure　and　ball　milling　on　Nb3Sn　phase　formation　and　superconducting　properties　were　investigated.　X-ray　diffraction　(XRD)　and　scanning　electron　microscope　(SEM)　were　used　to　analyze　the　phase　composition　and　surface　microstructure　of　mixed　powder　and　heat-treated　Nb3Sn　bulks　on　different　preparation　conditions.　Physical　property　measurement　system　(PPMS)　was　used　to　analyze　the　superconducting　properties　and　superconducting　phase　content　of　different　Nb3Sn　bulks.　The　results　suggested　that　the　pressure　of　powder　shaping　had　a　great　influence　on　the　density　of　the　bulks,　When　the　pressure　was　30　MPa,　the　density　of　the　bulk　was　8.03　g•cm-3,　but　the　density　hardly　increased　when　the　pressure　up　to　40　MPa.　The　average　particle　size　of　powders　would　be　affected　by　the　milling　time,　when　the　ball　milling　time　was　15　h,　the　average　particle　size　of　the　original　powder　was　reduced　from　100　μm　to　about　10　μm.　The　superconducting　transition　temperature　(Tc)　of　the　samples　with　different　ball　milling　time　had　little　difference,　but　the　longer　the　time,　the　higher　the　critical　current　density　(Jc).　By　changing　the　pressure　and　ball　milling　time,　Nb3Sn　superconducting　bulks　were　obtained　successfully　and　its　critical　transition　temperature　was　17.6　K,　critical　current　density　was　150　A•mm-2　under　the　background　magnetic　field　of　10　T.　©　Editorial　Office　of　Chinese　Journal　of　Rare　Metals.　All　right　reserved.