Abstract: The development of giant landslides on the upper reaches of the Yellow River has brought threats and potential hazards to the cascade power stations in the upper reaches of the Yellow River represented by the Longyang Gorge Hydropower Project, as well as the production, life, and property safety of residents. To analyze the surface deformation characteristics in the distribution area of giant landslides in the upper reaches of the Yellow River., this study used InSAR to extract and analyze the surface deformation information of landslide by using Sentinel-1A image data of ascending and descending orbit in the Xiazangtan landslide area in the upper right bank of the Yellow River in Jianzha, Qinghai Province. The monitoring results based on the InSAR method were then verified on site through field investigation. The results show that the maximum deformation rates of the landslide surface in the area obtained from the ascending and descending Sentinel-1A image data are 24 mm/a and 21 mm/a, respectively, with the maximum cumulative deformation of 133 mm and 128 mm. During the monitoring period from 2017 to 2022, with the increase in monitoring time, the cumulative displacement of secondary landslide feature points A and B located at the landslide front of Xiazangtan showed a gradual increase trend. The cumulative deformations of landslide surface obtained based on PS-InSAR and SBAS-InSAR methods have consistent characteristics, and the results show that the InSAR method is suitable for monitoring the surface deformation of giant landslide from Longyang Gorge to Jishi Gorge in the upper reaches of the Yellow River. This study not only provides an effective method for monitoring the surface deformation of giant landslides in the upper reaches of the Yellow River, but also provides data support and practical guidance for the effective prevention and treatment of ancient landslide resurrection in the basin.