Rigid-flexible　coupling　model　is　the　most　common　mechanics　model　for　multi-body　system,　and　discovering　the　law　of　multi-body　system　modeling　is　an　important　part　of　the　study　on　multi-body　mechanics.　This　paper　uses　finite　element　analysis　software　PATRAN　to　make　flexibility　treatment　on　the　parts　of　deep　groove　ball　bearing,　combines　with　the　virtual　prototype　technology　and　establishes　the　multi-flexibility　body　rigid-flexible　coupling　model　which　can　truly　reflect　the　dynamic　characteristics　of　the　bearing,　and　discusses　the　process　and　the　matters　needing　attention　for　generating　modal　neutral　file,　realizes　the　precise　modeling　for　fault　bearing,　and　provides　a　new　method　for　using　virtual　prototype　to　create　model.　©　(2013)　Trans　Tech　Publications,　Switzerland.