Abstract: Following the commissioning of hydropower stations, frequent water level fluctuations in the upstream reservoir area induced by activities such as reservoir storage and flood discharge, alter the original stability of the reservoir bank slopes.This alteration poses a significant risk of slope instability and damage, thereby impacting the safe operation of the hydropower station and posing potential safety hazards to the surrounding residential areas.To comprehensively understand the deformation of reservoir bank slopes during the impoundment of Wudongde Hydropower Station, sentinel data from ascending and descending orbits were processed using SBAS-InSAR technology for the period from May 2020 to August 2022.This study obtained surface deformation characteristics in the research area.By integrating reservoir water level variations with the SAR-derived slope soil moisture content backscattering coefficient, the deformation mechanisms of five identified unstable areas were analyzed.The results indicate that the use of ascending and descending InSAR accurately identifies the deformation of reservoir bank slopes, with the maximum annual average subsidence rate in the study area reaching-92 mm/a.The deformation trend of reservoir bank slopes exhibits a pronounced correlation with changes in reservoir water levels and soil moisture content backscattering coefficients.Reservoir impoundment is the main factor causing the accelerated settlement of slope.