The frequent occurrence of geological disasters has brought irreversible great harm to natural environment and human society directly or indirectly.In recent years,China has been strengthening the efforts of early identification and effective prevention of geological disasters.Interferometric Synthetic Aperture Radar (InSAR) has been recognized as an important deformation detecting method with the advantages of all-time,all-weather,high accuracy,and large scale monitoring.In this paper,potential geological hazard points in Qiandongnan prefecture of Guizhou were detected by processing ALOS-2/PALSAR-2 and Sentinel-1 SAR data with D-InSAR and SBAS time series InSAR.The detection results of four representative research areas revealed that:D-InSAR has advantage in large-scale detecting while SBAS has superiority in high-precision monitoring.Hence,the two methods can complement each other and improve the reliability of identification for geological hazards.The cumulative deformation time series and average deformation velocity can be obtained by SBAS simultaneously,which provides valuable reference for geological disaster prevention in Guizhou.