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The metro system solves traffic congestion in urban transportation while bringing potential deformation risks, especially in tunnels built in typical soft deposits in coastal cities. Time-series Synthetic Aperture Radar Interferometry (TS-InSAR) is an effective tool for monitoring land subsidence in urban areas. However, the different structures of metro lines, such as elevated tracks, ground lines, and tunnels, were often neglected in previous studies. Here, we introduced a Station Based Monitoring (SBM) method combined with InSAR analyses for metro safety monitoring. TS-InSAR provided the measurements along the elevated rails and ground lines. For tunnels, the TS-InSAR and SBM were jointly performed to deduct partial deformation under tunnels caused by land subsidence. The proposed metro system monitoring strategy was demonstrated and validated over the Shanghai Metro and Tianjin Rail Transit in the …