Abstract: The adsorption behaviors of Cs + and Yb 3+ on five minerals including calcite, kaolinite, montmorillonite, chlorite and glauconite are simultaneously investigated by the static equilibrium batch experiments with radioactive tracer technique. The experimental results indicate that under same experimental conditions (initial solution acidity, initial ion concentration and liquid solid phase ratio), the adsorption capacity ( Q ) in unit of mmol/g of montmorillonite towards Cs + and/or Yb 3+ are stronger than other 4 minerals, which display no evident difference of Q values. The R d of Cs + and Yb 3+ on the five minerals decrease with increase of their initial concentrations in solution. The uptakes of Cs + are ordinary lower than Yb 3+ except for the high c 0. The adsorption isotherms of Cs + and Yb 3+ are all in fairly agreement with the Freundlichs equation. The adsorption mechanism of Cs + and Yb 3+ in the systems of kaolinite, montmorillonite and chlorite at the experimental pH range is likely attributed to the process of ion exchange.