The environmental and geotechnical problems induced by spilled oil from China-Russia crude oil pipeline (CRCOP) need to be urgently studied and resolved after it was operated. A leaking experiment was conducted in laboratory to simulate and study the migrating process of oil contaminants. The results show that a dynamic equilibrium exists among volumes of oil

water and air in soil when oil contaminants are migrating through soil samples. Three of them jointly occupy the whole pore volume in soil. Oil contaminants exhibit three processes when they are migrating. Firstly

some contaminants are absorbed on soil particle surface. Some continue to migrate downward under the leaching of water. Finally

some are accumulated above the frozen layer. The different components of oil have the different migrating rates when they are migrating. Both carbon number and structure of hydrocarbons have significant impact on their migrating rates. The frozen layer in the lower part of soil sample

which has a low permeability

stop the migration of oil contaminants. The experimental results can provide solid basis on research of water-heat-mass transfer model of the multiphase flow in soils and impacts of oil on geotechnical properties of soil.