The rainfall threshold model is used to analyze the 227 cases of geological disasters of rainfall-induced landslides in typical hilly areas in the purpose of providing a reference for rainfall threshold for studying the relationship between rainfall and landslides. The results show that among the 227 cases of rainfall-type landslides from 2009 to 2018, there are 143 cases and 99 cases with more than 2 and more than 3 landslides event induced by rainfall in the same day, accounting for about 63% and 43% of the total landslides events, respectively. Thus it can be concluded that landslides affected by rainfall in Enyang District have the characteristics of mass occurrence. The rainfall intensity-rainfall duration threshold curve of rainfall-induced landslides in Enyang District, as well as the rainfall intensity with landslide mass-rainfall duration threshold curve can be obtained through analysis. According to the characteristics of time, the accuracy of forecast of rainfall-induced landslide events is improved. When 0<D ≤ 2, the conventional rainfall threshold curve model can be selected for forecasting, while when D>2, the mass rainfall threshold curve is selected for early forecasting. This study can solve the problem that the conventional landslide rainfall threshold curve has a higher false alarm rate for whether rainfall induces landslides, and the problem that the mass landslide rainfall threshold curve has a higher false alarm rate.