On the basis of the electric, radioactive and magnetic differences of soil, rock and water body and through investigating physical character variations of these three bodies, the authors conducted structural mapping and studied and evaluated water resource environment. It is concluded that three major factors have affected the water environment of coastal areas, i.e., the influence of marine transgression caused by geological movement, the surface subsidence resulting from the falling of the underground water level caused by human activities, and the water quality pollution and living environmental pollution from the natural and humancaused nuclear radiation.