Abstract: [Purposes] Research on geological hazards in large-scale water conservancy and hydropower projects located in mountainous and highly vegetated areas remains relatively scarce,and traditional geological hazard investigation methods are difficult to implement in such regions. [Methods] This study takes the Wujiangdu hydropower station as a case study,and combines 20 ascending orbit scenes and 23 descending orbit scenes of L-band Lutan-1 (LT-1)data with strong penetration capability with the SBAS-InSAR technique to monitor surface deformation and identify geological hazards in this inland area.In addition,spatiotemporal deformation characteristic analysis is conducted by integrating optical imagery,rainfall data,and geological fault data. [Findings] The results show that：①A total of 24 geological hazards were identified in the Wujiangdu Hydropower Station area using the ascending and descending orbit data of Lutan-1.Among these hazards,the largest deformation zones were jointly detected by both orbit datasets,with deformation rates reaching 125.96 mm/a for the ascending orbit and 103.92 mm/a for the descending orbit,which verifies the effectiveness of the proposed method for large-scale water conservancy and hydropower projects in mountainous and highly vegetated areas.②The combination of ascending and descending orbit data can effectively overcome the limitations caused by topographic factors and single-orbit datasets in such regions,thereby improving the accuracy of geological hazard identification.③The spatiotemporal evolution analysis of typical potential landslide bodies indicates that rainfall and geological faults are the dominant inducing factors for the formation of geological hazards in the study area. [Conclusions] This method provides scientific data support for geological hazard assessment and precise prevention and control in reservoir areas of large hydropower stations in mountainous regions with high vegetation．

Key words: LT-1, SBAS-InSAR, Wujiangdu hydropower station, geohazards