The illegal dumping of industrial waste was exposed at November in 1990. Industrial waste, including shredder-dust, slag, sludge, and the incinerated ash were carried into the Teshima island from 1978. The western part of this island in the Seto Inland Sea, Japan had been used as the illegal landfills for more than 10 years and the accumulated waste was estimated to be about 500,000 tons. The realities of heavy metal pollution for the soil, leachate, marine products, crab, and sea weeds were investigated at around the time of the cover soil treatment on the hazardous industrial waste of the landfill during 1991-1993. Afew reports of analytical results have been reported for chemical components of waste materials, plants, and marine products in Japan. It is characteristic that the concentration of Cu, Fe, Zn, Ni in soil with slag and the incinerated ash were very high, such as 8.3%, 1.5%, 0.9%, 0.1%, respectively.