Abstract：Geological hazards of the Wenchuan Great Earthquake are characterized by a wide affecting range and a high density. The main types of the geological hazards are collapse and landslide, the collapse occurs far more frequently than the landslide, and the secondary geological hazards are likely to be existent for a long period in future. These characteristics are caused mainly by the spread of the seismic waves from the inside of the earth's crust to the surface as well as the spread of the P wave after S wave, which results in the harm to the mountain's inside structure, followed by the loss of the stability of the surface rock. The differences between lithology, landform and rock inclination exert to a certain extent influence on the geological type and the spatial distribution. In the post-earthquake reconstruction, the arduousness of the task and the protracted nature of the geological hazard control should be taken fully into account.