Abstract: Land subsidence is a widespread geological hazard that significantly threatens the safety and stability of urban infrastructure and ecological environments. Fuyang City currently faces potential land subsidence risks. This study systematically monitored land subsidence in Fuyang City using distributed fiber optic sensing(DFOS)technology. Sensing cables were deployed in boreholes to monitor the deformation process of subsurface strata. The results demonstrate that DFOS technology effectively captures strata deformation and characterizes the vertical strain distribution. Monitoring data indicate that the main deformation zone of the soil-rock mass lies between depths of 77.7 and 197.3 meters, showing a compressive state with continuously increasing deformation. This suggests that settlement at the monitoring site is ongoing and has not yet stabilized. Between 2016 and 2021,land subsidence displayed an initial acceleration followed by deceleration. The most pronounced subsidence occurred during 2019-2020,reaching 39.02 mm, with the majority concentrated in the first half of the year. In contrast, the subsidence rate decreased significantly to 12.74 mm in 2021.