<p>The Lancang River valley, characterized by steep topography, active tectonics, and rapid river incision, is highly prone to geohazards such as landslides, posing significant risks to hydropower infrastructure and surrounding communities. Several giant landslides surround the Gushui Hydropower Station, currently under construction upstream on the Lancang River. However, knowledge on their spatial–temporal dynamics, which is essential for geohazard prevention and management, remains limited. In this study, we applied multi-temporal interferometric synthetic aperture radar (InSAR) analysis to monitor active landslides near the Gushui Hydropower Station, using ascending and descending Sentinel-1 datasets acquired from 2014 to 2022. Our analysis detected significant displacements, with maximum rates ~ 100&#xa0;mm/year in the eastward and vertical directions. Time series analysis indicates that landslide accelerations correlate with seasonal rainfall and may be further aggravated by water level fluctuations after the operation of the hydropower station. Thickness estimates from sloping local base level (SLBL) analysis revealed landslide volumes up to 169 million m³. Seasonal accelerations suggest that infiltration from rainfall and reservoir-induced pore pressure variations are primary drivers of instability, reducing slope strength and increasing the likelihood of landslide activation. To ensure the safe operation of the Gushui Hydropower Station and protect communities along the Lancang River, ongoing InSAR monitoring, supplemented by ground-based measurements, is crucial for developing effective early warning systems and geohazard prevention strategies.</p>