Fluorosis is a kind of biologic geochemistry disease which is found in particular geographic environment.It is controlled by multi-elments.The physical features of Gaomin city is high in south part and low in north part.The highest sea level is 92m and the lowest one is 7.5m.Atmospheric precipitation is major supplemental source of underground water.Water levels are decreasing from south to north part.Accompanying with evaporation of shallow underground water,fluorine content is increasing continuously,and ...