The coal resource in Xuzhou was rich. When the coal exploitation and utilization brought enormous economic and social benefits to the local people, it caused severe ground subsidence as well, affected the farmland, and damaged the buildings and roads. The radar image of differential interferometry technology (InSAR) could be able to detect the crustal deformation at centimeter scale or even more accurate. It had the advantages of all weather and wide area in monitoring settlement of subsidence of mine. Based on the monitoring of ground subsidence in Xuzhou mine, the authors introduced the application of InSAR technology in ground subsidence.