A certain compound will be produced in soil after nutrients were supplied, with the result that the hydraulic conductivity of the soil was decreased. In laboratory, potato soup were grouted in silty soil and backfill soil for this sake. The hydraulic conductivity of the silty soil was decreased by 95%, and the hydraulic conductivity of the backfill soil was decreased by 88%. Although the temperature of the experiment was below 20℃, the microbe had enough activity to repair leakage. The field experiment was carried out to grout potato soup into backfill soil beside the garage. The hydraulic conductivity of the backfill soil was decreased by 95%. As the temperature of the experiment reaching 30℃, the repair efficiency was showed rapidly.