In middle reaches of Hong Shui River

the basic structural net is constituted by the junctions of NW and NE faults. In neotectonic movement period

the region around power station became a relatively independent active body due to segmental relive of the NW

NE faults and Feng San fault block.The results from analysis of R. S. information combining with lithofacies-paleo-geograpic map and distribution of Hg mineralization show

that the Ya Du to Zi Yun deep-large fault （NW） was not included into the Feng San fault block in the neotectnic movement.Ba Yu region is 15 to 20 km distance wide from long Tan power station in fault block inside. Luo Xi active fault runs throughout this region

and the lighter earthquake is 4.6 level in recent period. This is a special region in the fault block inside which was located at a turn forward position of structural major axis of Le Ye large ring structures

the structural stress possibility concentrated at this area.Earthquake centers had closed relationship with the junctions of small ring faults. But this area is a relatively separate one

the small earthquake appeares frequently

the structural stress can be easy released

so there is no possibility to make a strong earthquake. This area has a good structural stability. But it must be carefule pay more attention to the earthquakes from reservoir stress.