Shearing　fracture　toughness　of　sintered　silver　(Ag)　is　an　important　parameter　to　reflect　its　shearing　resistance.　In　this　paper,　mode　II　fracture　toughness　of　sintered　Ag　is　investigated　based　on　end-notched　flexure　(ENF)　test.　Various　sintering　conditions　are　adopted　to　study　the　effect　of　sintering　parameters　on　mode　II　fracture　toughness　of　sintered　Ag.　The　results　show　that　the　fracture　toughness　of　sintered　Ag　increases　rapidly　with　the　increase　of　sintering　temperature　and　holding　time.　Three　shearing　crack　types　are　confirmed,　i.e.,　interface　delamination,　tunneling　cracking　and　cohesive　cracking,　and　the　cracking　type　varies　from　＂interface　delamination＂　or　＂tunneling　cracking＂　to　＂cohesive　cracking＂　with　the　increase　of　sintering　temperature　and　holding　time.　An　empirical　equation　is　proposed　to　predict　the　mode　II　fracture　toughness　of　sintered　Ag.　Through　statistics　investigation　on　microstructure　evolution,　it　is　found　that　the　shearing　fracture　toughness　heightens　with　enlargement　of　the　Ag　particle　size,　increase　of　the　particle　shape　form　factor,　and　decrease　of　the　porosity.　This　study　provides　an　alternative　method　to　rigorously　evaluate　the　shearing　fracture　toughness　of　die-attach　materials　in　electronics　packaging.