Under the action of the Wenchuan earthquake

the integrity of some mountains was destroyed and some slits appeared on the mountains. Main shocks caused soils and rocks damaged and its self-strength de-clined. The quantity of rainfall-induced landslides after the Wenchuan earthquake was much more than that before the earthquake.Five types of the landslides caused by the earthquake were classified based on the in-vestigation of rainfall-induced landslides after the Wenchuan earthquake. Active characteristics of rainfall-in-duced landslides were mainly embodied in the small and tremendous landslides widely developed along rivers and roads.Landslides and rainfall in the area had a better relationship and the delayed-time for the occurrence of landslides was very short.Massive landslides were developed under the condition of intensive rainstorms. In view of the development trend of rainfall-induced landslides

the small and medium landslides are dominant in the early time.However

the number of the small landslides will decrease but large or huge landslides will increase with increasing time.