Abstract:We use 90 Sentinel-1A satellite images acquired from January 2019 to March 2022 to monitor the surface deformation of Tianjin city and surrounding area by utilizing the PS-InSAR method. The results show that the land subsidence is mainly distributed in Shengfang town, Hebei province, near Tianjin city, with a maximum deformation rate reaching 80 mm/a. To explore the internal causes of settlement in Tianjin area, we analyze the geographical distribution of surface deformation by combining random forest land classification, which provides reference for the comprehensive management of geological disaster and the development and utilization of groundwater resources.