Mechanical　properties　of　the　joints　have　impacted　on　the　whole　mechanical　characteristics.　Coupling　the　joint　characteristics　in　the　modeling　of　the　machine　tool　is　an　important　problem　in　machine　mechanics　analysis.　In　order　to　solve　the　joint　modellings　in　the　assembled　structure,　this　paper　presents　a　new　method　to　creat　beam　elements　between　two　symmetrical　nodes　on　the　contact　surface　of　the　joint.　The　stiffness　and　damping　matrices　of　the　elements　are　valuated　according　to　the　characteristics　of　the　joint.　To　validate　the　accuracy　of　the　proposed　method,　the　modeling　of　an　assembled　structure　with　and　without　the　joints　is　obtained　and　some　corresponding　experimental　investigations　are　implemented.　The　error　between　the　simulated　and　experimental　results　of　the　finite　element　model　is　less　than　8.8%,　while　the　error　of　the　contact　model　often　used　in　the　existing　literatures　is　one　times　bigger　than　the　proposed　model.