Abstract: Global climate change leads to frequent torrential rains in Guangdong Province. Storm rainfall constantly updates history record. The disaster risk is high in small watershed areas. However, the capacity of disaster monitoring, early warning and its management is weak in those areas. Firstly, this paper analyzes the relationship between the rainfall and landslide based on the geological environment of landslide formation and the characteristics of the landslide. Secondly, the present situation and problems in disaster mitigation are analyzed. Finally, a set of framework and method of landslide disaster warning system is put forward. The early warning system can not only improve the space precision but also improve the disaster warning precision.