Abstract: Based on the quantitative analysis of phase compositions and its contributions to D-InSAR (Difference-Interferometric Synthetic Aperture Radar) monitoring, Tangshan City and Kailuan Mining Area, as the typical mining/industrial area in Eastern China, are selected as the experimental district for the application of D-InSAR to the monitoring and the dynamical analysis of surface subsidence. The 5-scene ERS1/2 SLC SAR data acquired from two temporal phases in 1997 and 1998 being selected as experimental data, the deformation in the line of sight was extracted separately by way of 2 pass and 3 pass D-InSAR By transforming the LOS deformation into vertical subsidence, the evolution of surface subsidence caused by underground coal mining and underground water exploitation was analyzed. The temporal decorrelation, spatial decorrelation and other error sources in D-InSAR monitoring in mining area were analyzed and discussed. As one of the key technologies for digital mine, it was suggested that the multi-temporal and the Connor Reflectors(or Plane Reflectors) could be applied in D-InSAR that is being used for the long-term surface subsidence monitoring in mining area.