In order to study the formation mechanism, process and trend of surface deformation, settlement funnel in mining area, obtain the law of the development of subsidence, and take effective measures to carry out ecological reconstruction in time, the D-In SAR is used to monitor the water soluble mining area.Sentinel-1A image data from 2015 to 2017 is selected as the interference image data, constituting two interference image pairs,making surface deformation monitoring. According to the defects of baseline error,atmosphere error,terrain error and time losing correlation of the interferemetry images, taking the SAR scape software as the study plat-form, based on the fine two-pass D-In SAR mode,the interferemetry images are processed by using registration method,baseline estimation method and phase unwrapping method,control point selection,orbital refining and re-leveling,got mine deformation map. With Arc GIS Spatial Analysis Tools and MATLAB software,overlay with leveling data, analysis of mining subsidence area of the spatial distribution of dynamic location. Accuracy and correlation analysis of D-In SAR deformation data and mining subsidence monitoring and error source analysis. The results show that from coarse to fine streamline D-In SAR monitoring results consistent with the deformation of the observed results, to meet the requirements of watermelon surface settlement volume acquisition accuracy.