In many cases, washing contaminated ground is very difficult. One major reason is the low permeability of fine-grained soils. In order to overcome such a problem, it was proposed to utilize the phenomenon of permeability which increases after freezing and thawing. A series of semi-full scale experiments have been carried out to investigate the feasibility of the method to an on-site remediation project. The major experimental results are as follows: 1) Permeability of fine-grained soil increased after freeze-thaw treatment. In this experiment, the soil's permeability increased 20 to 100 times. 2) It was observed in the specimen after the experiment that sodium chloride aqueous solution was pushed from the central part to the side direction of the specimen. In comparison with the unfrozen specimen, the frozen-thawed specimen was almost perfectly washed. 3) The washing efficiency of the frozen and thawed case was about 7 to 10 times greater than the non-frozen case.