Abstract: The thermodynamics and kinetics of Cd2+ adsorption and desorption on/from goethite， humic acid and its compound colloid with humic acids were studied by batch experiments. The results showed that within the range of cadmium concentration tested， Cd2+ adsorption was increased with the increase of its initial concentration， and the compound colloid had a higher Cd2+ adsorption capacity than goethite and humic acid. The adsorption isotherms of Cd2+ by the three samples could significantly confirm to Langmuir，Freundlich and Linear equation， while Langmuir was the best one. The maximum adsorption of Cd2+ by the three tested samples was 41.667，38.461，45.455 mg/g，respectively，according to Langmuir equation. The compound colloid had a lower Cd2+ desorption rates than goethite and humic acid， which was only 1.068% as compared to 5.871% from goethite and 5.918% from humic acid， indicating that compound colloid had a higher adsorption strength for cadmium. The kinetics of Cd2+ adsorption reactions by the three tested samples could be divided into two stages, namely the fast adsorption process with 4 hours, which could reach 90%~95% of the equilibrium, and a slow adsorption process afterwards.