After Hsiaolin Landslide that caused over 450 casualties during 2009 Typhoon Morakot, the government of Taiwan has constructed a nationwide 1 m resolution LiDAR derived DEM, which has been proven to be an effective tool for identifying deep-seated landslides. Since 2010, more than 9,000 deep-seated landslides that are over 10 ha respectively were identified in the DEM according to their morpho-tectonic features like the main escarpment, trench, double ridge and counterscarp. Additionally, a nationwide catastrophic landslide hazard assessment program was initiated in 2017. In the program, the activity of identified sites is evaluated based on InSAR analysis. The landslide susceptibility of these sites is also evaluated using a model constructed from the landslide inventory of Typhoon Morakot. According to the evaluation results of landslide activity, susceptibility and estimated vulnerability, 182 sites were further selected to carry out detailed investigations. Among them, 23 sites were installed with continuous GPS as the early warning system; some structural countermeasures have been made to 50 sites to reduce their level of risks; and a great effort has been put into the program to determine the rainfall triggering threshold and critical displacement rate for monitoring sites.