This　paper　presents　a　novel　soldering　material　for　stator　winding　lead　wire　of　high-power　generator　based　on　Cu@Sn@Ag　core-shell　preform.　The　Cu@Sn@Ag　preform　can　be　reflowed　at　280　degrees　C　for　10　min　under　a　pressure　of　0.5　MPa　in　the　atmosphere　and　the　resulting　bondline　can　withstand　high　temperature　up　to　450　degrees　C,　which　meets　the　ultimate　service　temperature　for　stator　winding　up　to　370　degrees　C.　The　results　show　that　Sn　phase　was　totally　transformed　into　Cu3Sn　and　Ag3Sn　phases,　surrounding　Cu　particles　after　reflowing.　The　Ag3Sn　phase　surrounded　outside　the　Cu3Sn　layer　and　filled　the　voids　caused　by　volume　shrinkage　of　Cu3Sn　phase　and　thus　formed　the　dense　interconnect　interface　of　Cu3Sn/Ag3Sn.　The　elastic　modulus　and　microhardness　of　the　Cu/Cu3Sn/Ag3Sn　bonding　bulk　were　reduced　by　15%　and　2%　respectively　by　forming　the　dense　interconnecting　interface　compared　to　Cu/Sn　system,　indicating　that　low-circle　fatigue　resistance　performance　of　Cu/Sn/Ag　system　is　excellent.　The　electrical　conductivity　of　bondline　was　5.4　mu　omega　center　dot　cm　and　thermal　conductivity　was　144.182　W　center　dot　m(-1)center　dot　K-1.　The　shear　strength　of　the　joints　was　44.9　MPa　and　40.3　MPa　as　reflow　and　after　aging　at　250　degrees　C　for　216　h,　respectively.　This　novel　preform　shows　great　potential　in　high-temperature　applications.