Abstract: The desorption behaviors of oil pollutants in water-soil system under static conditions are studied by a batch equilibrium method，including the desorption dynamics，isotherms and influencing factors. Experimental results illustrated that the desorption of oil pollutants in water-soil system is very fast，the desorption balance could be achieved within 40 min. The desorption isotherms are in an agreement with the Freundlich equation model. The desorption behaviors are affected by several factors，such as temperature，pH，ionic strength(Ca2+)，content of organic substances，content of sand in soil and the soil particle size and so on.