Bondline　thickness　effect　on　fracture　behaviors　and　cohesive　zone　model　(CZM)　is　an　important　topic　for　adhesive　joints.　In　this　paper,　the　fracture　and　CZM　of　sintered　nano　silver　adhesive　joints　are　investigated　based　on　end　notched　flexure　(ENF)　test.　Results　show　that　load　versus　displacement　curves　of　sintered　silver　adhesive　joints　is　sensitive　to　the　bondline　thickness.　With　compliance-based　beam　method　(CBBM),　the　shearing　fracture　toughness　of　sintered　silver　bonded　joints　heightens　with　the　increase　of　bondline　thickness,　which　indicates　that　shearing　fracture　toughness　is　highly　dependent　on　bondline　thickness.　R　curves　increase　steeply　for　short　equivalent　crack　length　and　become　plateau　for　long　equivalent　crack　length.　The　cracking　morphology　shows　that　the　cracking　paths　are　mainly　interfacial　and　interlayer　types.　The　bilinear　CZM　is　also　presented.　The　bondline　thickness　effect　on　CZM　parameter　is　presented　and　discussed.　The　CZM　given　in　this　paper　can　be　adopted　for　reliability　analysis　in　power　devices.