The　ill-posed　problem　is　produced　by　its　non-linear　property　of　bolted　joints,　noise　effect　and　numerical　error　at　using　the　frequency　response　functions　(FRFs)　to　identify　parameters　of　bolted　joints.　In　order　to　avoid　the　ill-posed　problem,　the　normal　and　tangential　dynamic　model　of　bolted　joints　is　established　by　sub-structure　synthesized　method,　and　using　weighted　function　method　to　make　the　coefficients　of　each　identification　equations　maintaining　at　the　same　level.　Then　using　the　FRFs　method　to　identify　parameters　of　bolted　joints,　respectivity,　the　identification　results　are　regarded　as　the　initial　numerical　values　and　calculated　the　sensitivity　by　iterative　method　in　the　whole　frequency　range.　In　the　end,　the　experimental　data　is　selected　by　sensitivity　method　and　then　to　identify　the　parameters　of　bolted　joints.　From　the　results　of　experiment　and　verification,　results　show　that　the　proposed　method　can　significantly　improve　the　accuracy　of　identification,　and　the　sensitivity　method　can　be　used　to　avoid　the　ill-conditioned　problem.　©　2013　Journal　of　Mechanical　Engineering.