A　method　for　identifying　joint　properties　from　the　measured　frequency　response　function　data　is　presented　in　this　paper.　Research　joint　which　made　of　metallurgical　powder　Porous　material,　and　constitute　uncoupling　model　with　one　degree　of　freedom　of　experimental　system,　identify　the　stiffness　and　damp　of　the　joint　in　the　two　cases:　one　is　no　medium,　the　other　is　using　oil　as　medium.　The　experiment　datum　shows,　the　mechanics　characteristic　of　the　joint　which　using　oil　as　medium　provides　certain　exaltation.　And　so,　the　application　of　manufacturing　the　joint　of　tool　machine　with　metallurgical　powder　material　will　be　extensively.