With the increasing need of protecting the living environment from soil pollution in addition to air and water protection in recent years, the new law for soil pollution control was established in the Ordinary Session of the Diet in 2002. In this report we would like to introduce the outline of the solvent extraction system introduced in 2001 from Terra-Kleen Response Group, Inc., U.S.A. as a technology for purifying the soil contaminated with oils and PCB as well as the outline of the research and development program of Mitsubishi Heavy Industries Ltd. (MHI) on soil remediation technology, focusing mainly on the current status of verification and research in PCB contaminated soil remediation that started in 2001 using the aforesaid technology.