Shearing　fracture　behaviors　of　nickel　coated　multiwall　carbon　nanotubes　(Ni-MWCNTs)　reinforced　sintered　silver　were　investigated　based　on　end-notched　flexure　(ENF)　test　in　this　paper.　By　mechanical　mixture　of　Ni-MWCNTs　with　sintered　silver,　an　enhanced　shearing　fracture　toughness　is　obtained　at　content　of　0.5　wt%　Ni-MWCNTs　.　Shearing　fracture　toughness　of　sintered　silver　with　different　contents　of　Ni-MWCNTs　has　been　investigated.　Upon　adding　the　proper　Ni-MWCNTs,　the　cracking　path　in　sintered　silver　turns　to　be　cohesive　cracking　easily,　which　leads　to　increase　of　shearing　fracture　toughness.　The　average　critical　energy　release　rate　obtained　at　content　of　0.5　wt　%　Ni-MWCNTs　sintered　silver　has　been　increased　by　67.98%　and　the　maximum　critical　energy　release　rate　was　increased　to　2.1　times　that　of　average　condition　in　sintered　silver　without　additive.　The　enhancement　mechanism　and　agglomeration　effect　of　Ni-MWCNTs　are　discussed.　The　different　microstructure　characteristics　of　Ni-MWCNTs　sintered　silver　are　also　presented.　The　fracture　properties　of　sintered　silver　with　different　Ni-MWCNTs　additive　contents　are　discussed　and　clarified.　The　sintered　method　presented　in　this　paper　satisfies　the　requirements　of　low　temperature　and　low　pressure　joining　technique　in　electronics　implications.　This　study　presents　a　novel　insight　on　improving　the　shearing　fracture　resistance　by　adding　carbon-based　nanomaterial　for　those　die-attaching　materials　in　electronic　packaging　of　power　devices.