Abstract: The Three Gorges Reservoir area along the Yangtze River frequently experiences landslides due to its challenging engineering geological and hydrogeological conditions,as well as periodic reservoir water-level fluctuations. Traditional surface deformation monitoring techniques are often limited by high equipment costs and insufficient spatial coverage. To address these constraints,this study utilized 82 Sentinel-1A SAR images to monitor the temporal deformation of the Xinpu landslide in Fengjie County from April 2018 to May 2021. The deformation rates along the slope direction and in the vertical direction were obtained by projecting the line-of-sight velocities. The reliability of the InSAR-derived results was validated through comparison with GNSS surface monitoring data from the same period. The results indicate that the middle and rear sections of the Xinpu landslide remain relatively stable,while the front section exhibits continuous creep deformation throughout the monitoring period. The most active deformation zone extends from the central front of the landslide toward the slope toe,with the maximum slope-direction deformation rate reaching 207 mm per year. The time-series displacement curves show pronounced step-like characteristics,which are more evident in the leading edge than in the trailing edge. Accelerated deformation occurs during periods of rapid reservoir drawdown and the rainy season. These findings highlight the potential of SBAS-InSAR technology for reservoir landslide monitoring and provide valuable technical support for disaster prevention and mitigation in the Three Gorges Reservoir area.