Abstract: A theory on coupling of earth's endogenic and exogenic geological processes is proporced to interpret origins serious geological dissters. In previous classifications and studies of natural disasters the endogenic geological disaster area and exogenic geological disaster area were distinguished, but no enough attention was paid to their counnections. In this paper it is argued that coupling of endogenic and exogenic geological processes is offen the overall origin of serious geological disasters in most of the active crustal movement area of China. It is also pointed out that study of the coupling of endogenic and exogenic geological processes related to serious geological disasters is important for their evaluation and prediction.