Abstract: Using monthly Sentinel-1A satellite data from 2018 to 2021, this study applied D-InSAR and PS-InSAR techniques to conduct a comparative experimental analysis of slow topographic changes, with the Salween River estuary as the study area. The results show that the change processes and characteristics derived from both techniques exhibit a significant degree of consistency, with PS-InSAR demonstrating higher accuracy. The average change rate in the study area over four years is 5 mm/year. The northern coast, where the north-south and east-west tributaries converge at the estuary, initially exhibits accumulation followed by erosion, while the southwestern islands show clear accumulation characteristics. This experiment not only helps students understand the principles and methods of analyzing slow changes in estuarine delta topography and master InSAR data processing techniques, but also cultivates students’ practical skills and research qualities, providing a reference for experimental design in remote sensing courses.