The landscape and rivers were rejuvenated in Longgong region by the tectonic movement in Quaternary Period, which arranged series of morphology in the catchment that consisted of fluvial valleys, blind valleys, poljes and depressions in turn from the divide to the base.

Based on GIS,the polje geo-database of Guizhou province is established,with ASTER remote sensing images and 1:50 000 topographic maps as the core data.

For the valley slope unload lotus feature in dam area of Guangzhao hydroelectric station as example, this paper analysis the overall and different rock region slope unload lotus feature of Guangzhao valley area,and influence of slope unloading to project where land stress is medium.

Study on phreatic water resources dynamic state in clench and sloping land;