Abstract: The problem of environmental geology effect caused by coal mining is analyzed in the view of exploitation of coal resources.The influencing factors of variation in environmental geology in this area and countermeasure of prevention and cure are discussed in the paper.The land subsidence caused by mining is the main factor of environmental effect in this area.It impacts profitably on shipping,construction on the east route of China′s South-to North water project,prolonging the life of Nansihu Area.