PurposeIn　order　to　improve　the　isolation　capability　of　the　longitudinal　vibration　of　the　shafting　system　in　the　low　frequency　range,　a　lever-type　isolator　with　negative　stiffness　(LTINS)　was　proposed.MethodsThe　LTINS　arranged　in　parallel　with　the　thrust　bearing　to　isolate　the　longitudinal　fluctuating　force　transmitted　from　the　propeller-shaft　to　its　foundation.　The　Rayleigh-Ritz　method　is　used　to　establish　the　longitudinal　dynamic　model　of　the　propeller-shaft-LTINS　system.ResultsThe　force　transmissibility　of　the　coupled　system　is　formulated,　and　computed　results　are　compared　with　those　solutions　obtained　from　the　finite　element　method.　A　stability　analysis　is　carried　out　based　on　the　equivalent　static　and　dynamic　stiffness　of　the　thrust　bearing　of　the　shafting　system.　A　comparison　study　is　conducted　to　compare　the　isolation　performance　of　the　proposed　isolator　with　the　traditional　isolator　such　as　the　dynamic　anti-resonance　vibration　isolator　(DAVI),　absorber　such　as　the　dynamic　vibration　absorber　(DVA),　and　dynamic　vibration　absorber　with　negative　stiffness　(DVANS).　Parametric　optimization　is　carried　out　to　investigate　the　impact　of　the　parameters　of　the　LTINS　on　its　isolation　performance.ConclusionThe　results　indicated　that　the　proposed　control　method　can　achieve　a　much　wider　bandwidth　than　that　of　the　traditional　vibration　control　scheme　with　a　much　smaller　mass　ratio.