In　this　paper,　the　effect　of　different　surface　finish　metallization　layers　(Cu,　Ni,　Au　and　Ag)　on　the　shearing　fracture　toughness　of　sintered　Ag　bonded　joints　under　various　sintering　temperatures　is　investigated　based　on　end-notch　flexure　(ENF)　test.　The　results　show　that　the　shearing　fracture　toughness　for　different　kinds　of　specimens　all　increase　with　the　sintering　temperature　augment.　The　sintered　Ag/Ag　joint　shows　the　highest　shearing　fracture　toughness　while　the　sintered　Ag/Ni　joint　shows　the　lowest.　The　average　shearing　fracture　toughness　of　the　Ag/Cu　joint　is　very　close　to　the　Ag/Au　joint　when　sintered　from　240　?&　nbsp;to　280　?,　whereas　the　former　became　much　higher　when　sintered　under　300　?.　By　statistically　analysis　of　crack　propagation　paths,　interface　microstructure　characteristics,　and　interface　reaction,　it　is　found　that　the　main　factors　affecting　the　discrepancy　of　the　shearing　fracture　toughness　for　different　metallized　layers　are　the　interface　connection　ratio　and　contact　angle.　A　higher　interface　connection　ratio　and　lower　contact　angle　can　increase　the　actual　crack　resistance　and　lower　down　stress　concentration　at　the　bonding　interface,　which　leads　to　the　discrepancy　of　shearing　fracture　toughness　correspondingly.　The　different　inter-diffusion　rates　for　Ag　and　various　metallization　layers　are　also　clarified.　This　study　could　deepen　the　understanding　of　the　metallization　layer　effect　on　the　shearing　fracture　behaviors　of　sintered　silver　bonded　joints.