Abstract: Traditional landslide monitoring methods suffer from drawbacks such as high costs, low efficiency, and limited spatial coverage, making it difficult to achieve efficient areal observation. This study introduced the technology and principles of SBAS-InSAR and applied it to the monitoring of Outang landslide deformation in the Three Gorges Reservoir area. Sentinel satellite data were used to obtain high-precision surface deformation information. Through data processing, deformation calculation, and result analysis, the results indicated that the SBAS-InSAR monitoring results exhibited a high correlation with leveling observations and a small root mean square error. This technology demonstrates reliable accuracy in monitoring vertical deformation of landslides in the reservoir area and meets the requirements for landslide safety monitoring. The research findings can provide a scientific basis for landslide disaster early warning and prevention, offering reference value for landslide monitoring along reservoir banks.