Abstract: Isothermal adsorption were carried out to discussed the characters and influential factors of adsorption and desorption of cadmium under two conditions. The one is that there is only goethite, and the other one is the coexistensive system of fulvic acid and goethite. The results of this experiment show that the adsorption of cadmium on goethite is intense, and the adsorption is more intense under the condition which have both goethite and fulvic acid. The research shows that the FA-goethite coexistensive system is quite effectual in the way of controlling the heavy metal pollution of cadmium.