Landslide activties in this area can be obviously divided into four active periods,each of them corresponds to Bailong River's downcuttlng tirne.The most active gelilgic elements of the landslide are silurian phyllite,slate and schist and their activity index are up to 0.8326.According to the frequency of landslide,its altitude above seaulevel and the naturepropety of rock stratum,the stabilities of slope areas are classified.