In the oil recovery operation of Nakhodka oil spill, recovered oil was temporary stored in the storage pit that excavated on the backland of quay wall. In the case of using the temporary oil storage pit, the oil contamination of sandy ground was to be considered. In this paper, a series of experiments on permeability coefficient of sand against oil, capillary height of oil against sand and 2-dimensional oil distribution into sand were carried out. And characteristics of oil permeation into sand were discussed.