As　a　long-term　monitoring　index,　longitudinal　settlement,　especially　uneven　settlement,　has　been　effectively　used　for　the　structural　safety　evaluation　of　shield　tunnels　in　their　operational　periods.　Due　to　the　lack　of　distributed　characteristic,　the　widely　used　traditional　monitoring　method,　which　is　based　on　manual　observations　of　settlements　at　some　preset　uniformly　spaced　observation　points,　may　not　capture　the　longitudinal　uneven　settlements　randomly　occurred　in　the　practical　shield　tunnels.　Consequently,　based　on　the　previous　improved　conjugate　beam　method　(ICBM)　for　beam　deformation　monitoring　using　distributed　fiber　optic　strain　sensing　technique,　the　applicability　of　ICBM　in　monitoring　the　distributed　settlements　in　shield　tunnels　was　theoretically　proved.　Next,　based　on　the　ICBM,　a　monitoring　strategy　was　proposed　to　monitor　the　distributed　settlements　in　shield　tunnels　by　combining　the　quasi-distributed　Fiber　Bragg　Grating　sensors　with　the　hydrostatic　level　measuring　system.　Finally,　a　reduced-scale　concrete　longitudinal　model　test　was　carried　out　to　verify　the　precision　of　the　proposed　strategy　for　distributed　settlement　monitoring　in　shield　tunnels.　Experimental　results　show　that　by　using　the　proposed　method,　the　maximum　error　in　the　monitored　settlement　in　the　shield　tunnel　model　is　only　10%.