The Knowledge Discovery in Database (KDD) technology is used to analyze and investigate the relationship between precipitation and the damageinducing meteorological geologic disasters in Yunnan Province. The findings conclude that most meteorological geologic disasters are induced by strong precipitation; there mainly are three types of relationship: induced by heavy rainfall, induced by multiday moderatetoheavy rainfall, and induced by consecutive rainfall. The quantitative relationship provides the evidence not only for the meteorological surveillance and forecast of meteorological geologic disasters, but also for the prediction model development in the Yunnan Province.