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Landslide is one of the major geological disasters in the world that causes casualties and economic losses. The Differential Interferometric Synthetic Aperture Radar (DInSAR) is an important landslide monitoring technology. However, due to the limited to SAR image resolution, small-scale landslide is often difficult to identify and monitor effectively with PSI technology. Low-resolution images that greatly reduce the density of Permanent Scatters (PSs) of the monitoring area, limiting the wide application of this technology in practice. Thus, Sentinel-1 IW mode images combined with Quasi-PS InSAR enables the application of DInSAR techniques in small-scale landslide monitoring. In this study, Quasi-PS InSAR has been employed together to 41 Sentinel-1 (S1) images, IW mode, to monitor the landslides (Three Gorges Reservoir Area, China). The results show that the S1 data and Quasi-PS InSAR allows for obtaining high density of PSs. Due to the high effective PSs density, the boundaries of the landslide deformation of the Fanjiaping landslide has been highlighted. This study indicates that the Quasi-PS InSAR together with S1 data can be an important means to characterize deformation rates and extension of complex small-scale landslides in challenging areas.