In　this　thesis,　a　new　identification　method　for　joint　stiffness　and　damping　has　been　developed　by　using　the　substructure　synthesis　method　and　finite　element　modeling.　The　substructure　synthesis　method　is　stated　firstly,　according　to　the　substructures　are　connected　by　joints　and　the　equilibrium　and　compatibility　conditions　at　the　joints　have　to　be　fulfilled,　establishing　identification　equation　through　completely　frequency　response　function.　Then,　finite　element　model　is　established,　and　update　this　model,　make　use　of　the　update　model　to　replace　the　experimental　model,　using　an　accurate　finite　element　model　to　obtain　the　required　data.　In　order　to　ensure　the　stability　of　the　numerical　calculation,　translate　inconsistent　equation　into　the　general　solution　through　the　principle　of　least　squares,　besides　the　introduction　of　the　concept　of　weighted,　makes　the　measured　data　can　be　fully　utilized.　Finally,　the　method　is　applied　to　a　simulated　example　and　good　agreement　is　found　between　identified　and　true　parameters.