Based on the topography

geomorphic character

stratigraphic tex-ture

physical and machanic indexes of landslide soil of Nanta landslide inTongchuan city and the hydrogeological condition of landsliding areasinformation

etc.

this paper analyses the causes of this landslide and app-raises the stability of landslide in detail. It is considered that this is arepeatedly sliding and large scale landslide

the main causes of its form-ing relates to the rock structure and natural factors. It is relatively sta-ble landslide containing unstable factors.