The adsorption of organic contaminants in soil is one of the most important factors affecting the migration and transformation process of these organic contaminants. Using batch experiments, this paper studied the adsorption behaviors of Trichloroethylene (TCE) in soil samples with different contents of organic carbon. The results indicate that the adsorption capacity is significantly correlated with different contents of organic carbon. There exist critical threshold values （foc*） of organic carbon contents. The minimum foc* and the maximum foc* are equal to 0.702% and 1.831%, respectively. The TCE adsorption capacity does not vary greatly with the increasing of organic carbon contents when foc is lower than 0.702%. Nevertheless, the TCE adsorption capacity varies considerably with the increasing of organic carbon contents when 0.702%