Abstract: Ground subsidence is one of the main geological hazards in mining area of mining area.Using PS-InSAR technology to deal with the 21 Sentinel-1 data of the Guangxi Pingnan Xijikeng lead zinc mine, the surface subsidence distribution cloud map, the contour line section and the change curve of the settlement rate of the observation point are drawn.Compared with the traditional methods, PS-InSAR technology greatly improves the intuition, integrity and predictability of land subsidence research, and provides a reliable basis for the prevention and settlement of subsidence in the goaf and the summing up of the settlement law and verifies the monitoring results obtained by PS-InSAR technology through numerical simulation technology.