Landslides are one of the most dangerous geological hazards in mountainous areas that directly threaten human lives and properties every year. Meanwhile, a landslide susceptibility map can provide useful information for local authorities in implementing suitable land-use planning, mitigating, and establishing the early warning system. Facing the current global climate change, landslide events also have been unpredictable and complicated. This fact requires landslide susceptibility maps need to be updated regularly and continuously. In addition, the mountain areas of Vietnam have faced the limitation of human resources and types of equipment. This proposed method has the capacity for quick calculation and high reliability. Thus, this study used the FR model and GIS technology to build a landslide susceptibility map for the Pac Nam district, Bac Kan province. This proposed method has the capacity for quick calculation and high reliability. The input data consists of 146 historical landslide positions and 10 layers related to the topographical, environmental, and climatic conditions. Based on the ROC curve analysis results of the test dataset, the resulting map of this study can be effectively applied in the management, prevention, and mitigation of landslide risks in mountainous regions.