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Based on geological disaster data and the corresponding precipitation data of Chengde, the regularities of geological disasters in Chengde are revealed, and the correlation between geological disasters and precipitation is found. The results show that local strong precipitation is the major triggering factor of geological disasters. Because of different geological structures in different regions, the study divided geological disasters in Chengde into three categories according to the regionalization of geological disasters, the precipitation intensity of the same day, and previous precipitation in Chengde, and identified three kinds of atmospheric circulation patterns favorable to the occurrence of geological disasters. The graded meteorological forecasting and pre-warning system of geological disasters is established accordingly and put into operation in 2005. The results proved encouraging.