In this paper, the forming mechanism of a group of landslide has been analyzed based on detailed survey on the debris for the runoff and infiltration on the slope boundary due to erosion by rainfall and the foot of the slope had been continuously eroded by the water-flow down from the up-reach during rainfall. The existence of the deep gully also provided well geological condition for continuing sliding. Measures should be taken on the slope to prevent large hazard from further happening, especially for the security of local residents. A primary plan has been presented in this paper. It should...