Abstract: Due to time concentration and large deformation in ground movement and deformation caused by coal mining，there are various limitations in monitoring coal mining subsidence with D-InSAR，and it is difficult to obtain accurate surface subsidence information.In order to apply D-InSAR technology to monitoring land subsidence in coal-mining areas，RadarSat-2 data are processed by “two-pass” differential interference technology.The effects of vegetation factor on the coherence between images were analyzed through experiments，and the influence of monitoring magnitude on the interpretation results of surface subsidence was explored.With Jiulong mine in Fengfeng coal mining area as an experimental zone，the monitoring precision based on D-InSAR technology was analyzed.The results show that vegetation coverage rate is the decisive factor of affecting the coherence between images，and D-InSAR technology can be better used in less vegetation in winter than more vegetation in summer.Subsidence velocity exceeds the range that can be monitored by the satellite and only the deformation of the basin edge can be accurately monitored due to the complexity of geological and mining conditions；when mining subsidence does not exceed monitoring magnitude，the monitoring results by D-InSAR technology are consistent with the usual leveling monitoring data.With the depth of relevant theory and the maturity of processing software，the D-InSAR technology will have a broader application prospect in coal-mining areas.

Key words: D-InSAR, Mining subsidence, Deformation monitoring, Vegetation, Monitoring magnitude, Monitoring precision