Abstract: Compared with the traditional integrated salvage techniques for shipwrecks,the rectangular curved pipe basing method demonstrates superior operational efficiency characterized by reduced construction timelines and minimized damage to shipwrecks.In order to obtain the real-time displacement of the main components (stull supports,lateral containment plates and propulsion conduits) of the curved pipe basing method during the shipwreck salvage process,we implemented distributed optical fiber sensing technology utilizing optical frequency domain reflectometry (OFDR).The displacement calculation formulae were derived based on strain-field monitored by optical fibers.The results show that,during the settlement phase of the stull-plate frame,due to the asymmetric loading conditions on both sides of the stull,the deformation modes along the vertical direction are different.The lateral containment plate is less affected by differential loading and the maximum lateral displacement remains below 0.3 mm.Throughout conduit advancement operations,both the lateral displacement and radial convergence displacement trends were similar,but neither exceeded 1 mm.The deformation magnitudes of lateral containment plates and stull supports were less than those of the settlement phase.Our findings provide a technical foundation and case references for the application of fiber optic sensing technology in strain and displacement monitoring of underground engineering structures.