Synthetic aperture radar (SAR) image is not widely used in the field of change detection due to coherent spot noise, imaging geometric distortion, and the complexity of background information. This paper summarizes the current commonly used SAR image-based change detection methods and technical processes, builds Gaofen-3 SAR image difference interferometry and polarization data change detection technology methods and processes, and chooses the new well open coal mine area in Inner Mongolia, successfully verifying the technology feasibility and reliability of the application of GF-3 images to change detection . The main conclusions are as follows: 1) the deformation map of new coal mine is successfully obtained based on GF-3 satellite differential image differential interferometry, and the large deformation area basically coincides with the optical image interpretation results, proving that GF-3 satellite has differential interferometric capability; 2) the new coal mine accident location based on GF-3 image change detection is accurate, and the extracted change area is 0.128 km², which is basically consistent with the publicly released monitoring results (0.1 km²), proving that GF-3 image can be applied to surface change detection.