Abstract: In order to improve the heavy metal ion adsorption capacity of rice shell biochar,a new ad-sorption material hydroxyapatite charatized rice husk ( HAP @ BC)was prepared by loading nanohydroxyapatite on the rice shell biochar. Cu(Ⅱ) adsorption experiments were constructed to study theadsorption properties of the modified material,and the appropriate application conditions. Theadsorption mechanism was analyzed by sorption kinetics,sorption isotherm model and sorption thermo-dynamics. The results showed that when 1.0 g /L HAP @ BC was used to treat simulated Cu ( Ⅱ)wastewater with initial concentration of 50 mg /L at 35 ℃ and initial pH of 5.0,the Cu(Ⅱ) residualconcentration was 1.6 mg /L and the removal efficiency was 96.80%. The adsorption process conformedto the quasi-secondary adsorption kinetic model and the Langumuir isothermal model. It was a sponta-neous endothermic process,and is more inclined to chemical adsorption control. Close-