Abstract: A new type of optical frequency domain distributed optical fiber sensing technology (OFDR) was used to conduct laboratory model tests on the dislocation deformation of the tunnel segment under loading conditions, laying optical fibers at fixed points along the longitudinal direction, improving the existing quantitative calculation method of dislocation deformation, and the calculated value of the optical fiber strain was compared with the actual measurement of the percentile monitoring. At the same time, the influence of the fixed-point distance on the monitoring results was explored. The results of laboratory tests show that OFDR can accurately reflect the strain of the monitoring point and reveal the law of segment dislocation deformation. The improved calculation method can more accurately calculate the dislocation deformation of the tunnel segment, which is comparable to the monitoring value in actual projects. With the increase of the fixed-point distance, the dislocation deformation calculated by the optical fiber strain also increases.