In this study, DB18C6/SiO2 composite material was used to adsorb Zr(IV) and Hf(IV) from water. Effects of media pH, adsorption dynamics, adsorption isotherms and adsorption thermodynamics were examined in the batch mode. The results indicated that at 25℃, the maximum adsorption capacities of Zr(IV) and Hf(IV) were attained at pH 1.5, and the adsorption kinetics followed the mechanism of the pseudo-second-order equation. The adsorption for Zr(IV) was an exothermic and spontaneous progress and the isotherm adsorption followed the isothermal adsorption model of Langmuir. While, the adsorption for Hf(IV) was an endothermic and spontaneous progress and the isotherm adsorption followed the isothermal adsorption model of Freundlich. Besides, the crown ether content and surface area of the composite material were characterized by Element Analysis and BET.