Using day by day precipitation data from May to October during the period of 200 1—2005, the landslide and debris flow cases and the grades data of geology and geomorphology feature, the relationship between the landslide and debris flows a nd precipitation in Yunnan Province under the different geology and physiogn omy conditions was investigated. The results indicated that there is close relat io n between the landslide and debris flows and the preceding cumulative precipit ation. The most sensitive rainfall conditions are 8days cumulative precipitati on(40～50mm), 9days cumulative precipitation(70～80mm), 10days cumulative prec ipitation(100～110mm) and 1～2days cumulative precipitation(30～40mm), etc. Un der the conditions of the deficiency of precipitation observation spatial densit y, it is very important that preceding cumulative precipitation was applied to a nalyzing the relationship between the landslide and debris flows and the precipi tation. Under the conditions of various geology and geomorphology, the landslide and debris flows respond well to precipitation. It is very useful for reducing empty prediction ratio to synthetically con sidering various geology and geomorphology in the course of prediction.