Abstract：Historical data of landslides and rainfall of some counties and cities in the Three Gorges area are investigated in detail，and the relationship between rainfall and rainfall-induced landslides is analyzed from three different points of view，rainfall，rainstorm and rainfall duration. The conception of rainfall-factor is suggested thereafter. At the same time，a new method of predicting rainfall-induced landslides is proposed to depict the probability of rainfall-induced landslides quantitatively. Every rainfall-sub-factor is graded according to some criteria，and then the relationship between rainfall-factor and rainfall-induced landslides is studied. It is proved that this new method of landslide prediction can predict the occurrence time of landslides with higher precision through applying it to Wanxian，a city in the Three Gorges area. This method of landslides prediction would lay a solid foundation for predicting rainfall-induced landslide according to historical data of rainfall and landslides.
