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Batch experiments were conducted to investigate the adsorption behavior of Tween 80 in the systems composed of Tween 80, CdCl 2 , and/or DDT. Results show that Cd 2+ from CdCl 2 is the functional fraction influencing the adsorption of Tween 80 to soil, rather than Cl -.Moreover, DDT can induce the increase of the critical micelle concentration (CMC) of Tween 80, which further impacts the Tween 80 adsorption behavior. The Tween 80 adsorption to soil in the Cd 2+ -DDT coexisted system follows the Langmuir isotherm, same as in the Tween 80-Cd 2+ or -DDT systems. Cd 2+ and/or DDT decrease(s) the adsorption capacity of Tween 80 to soil, and the magnitude of decrease is dependent on the concentration of coexisting pollutants. Although DDT has a stronger inhibitory effect on Tween 80 adsorption than Cd 2+ under the same DDT/Cd 2+ concentrations, the coexistence of Cd 2+ and DDT has an antagonistic effect on the adsorption of Tween 80. This effect is affected by the concentrations of the coexisted pollutants, and is a result of the complex interaction among the three pollutants.