The adsorption of organic contaminants in the vadose is one of the most important factors affecting their migration and transformation process. Basedon batch experiments, this paper deals with the adsorption behavior of trichlorinated hydrocarbon (TCE) on soil samples with different contents of organic carbon. The results indicate that the content of organic carbon in samples from the surface part is higher than that collected from the deep part. Generally speaking, the adsorption capacity increases with the increasing content of organic carbon, but the difference of the adsorption capacity can reach as high as 5 times for samples with the same organic carbon content, suggesting that there probably exists competition adsorption, and that mineral adsorption might be the major mechanism. The adsorption of surface soil fits the liner adsorption well, and there exists no saturated adsorption capacity. In deeper soil with lower organic carbon, however, the adsorption seems to be nonlinear.