[Objective] We chose the most significant rainfall indicators of landslides and debris flows in typical regions and built a critical threshold model for each sub-region in typical regions to provide a scientific basis for effective prediction of landslide and debris flows.[Methods] This study collected Sichuan's geological disaster cases occurred in 1999-2014, to define the typical regions of landslides and debris flows in Sichuan Province. We compared the threshold models that are made up of different rainfall indicators in each typical region to construct our rainfall threshold models.[Results] Average rainfall intensity and maximum rainfall intensity are used frequently as significant parameters in threshold models of landslides and debris flows in typical regions. Indirect rainfall is a precipitation indicator of landslides in typical region generally, direct rainfall is a precipitation indicator of debris flows just in typical region generally. Effective rainfall was adopted to the precipitation indicator both of landslides and debris flow threshold models in typical regions. Model with double factors were applied to most of typical regions of landslides and debris flows. Model with one factor was just applied to Wenchuan earthquake-stricken area, the critical threshold gradually raised from Wenchuan earthquake.[Conclusion] Different rainfall factor has different effect on disasters, each typical region has its own optimum rainfall threshold model. Model with double factors is more objective than those with just one factor, as they contain more rainfall factors.