With the development of human society, the problem of surface deformation has become increasingly prominent and has aroused widespread concern in society. SBAS-InSAR technology is an improvement over traditional D-InSAR technology. There is a tendency of SBAS-InSAR having been great advantages when performing long-term and slow land subsidence monitoring operations. It can be combined with a variety of technologies to complete land subsidence monitoring work in complex terrain. This paper uses SBAS-InSAR technology to monitor the subsidence of some areas in Lajia Town, Qinghai Province China to verify the feasibility of using SBAS-InSAR for subsidence observation.