The construction and operation of the subway is likely to cause vertical settlement of the surface, thus affecting the development of the city and the safety of people's lives and property. Therefore, it is of great practical significance to master the ground subsidence along the subway lines in time. This article takes the Nanning subway as an example and has adopted Sentinel-1A SAR data and TS-InSAR technology. The external high-precision POD Precise Orbit Ephemerides and ASTER GDEM V2 have been used to remove the phase jump caused by the decorrelation, and the ground subsidence rate field of the Nanning subway network from June 2017 to January 2019 was obtained. On this basis, the spatial and temporal distribution characteristics of land subsidence and land subsidence along the subway have been analyzed. The results showed that, from 2017 to 2019, the overall surface subsidence characteristics of Nanning are obvious, and the maximum cumulative subsidence is -47.41 mm. The surface deformation in most areas is relatively stable, and the areas where subsidence occurs are mainly distributed on the ground along the subway. With the rapid development of Nanning's economy and the acceleration of urban subway construction, the trend of surface settlement along the various subway lines is gradually increasing and spreading.