The carbonated hydroxyapatite/potash feldspar composite adsorbent（CHAK） used to remove heavy metal nickel in water were prepared by liquid method with potash feldspar as the raw material.The effects of the adsorbent amount,initial so-lution pH,adsorption time and initial concentration of Ni ²⁺ on the adsorbability were investigated by static adsorption test.In addition,kinetics and thermodynamic were used to explore the adsorption mechanism.Results showed that with the increase of CHAK,the removal rate of Ni ²⁺ was increased,while the adsorption capacity of Ni ²⁺ was decreased.The optimal adsorption effect was obtained with the pH of 6.The adsorption equilibrium obtained with the adsorption time of 10 h.The adsorption ability of CHAK to Ni ²⁺ increased with the initial mass concentration of Ni ²⁺ at 50~4 000 mg/L,and then it reached stabilized. The saturated adsorption capacity of the CHAK was 7.1 times than that of the raw material.The kinetic and thermodynamic fitting results showed that the pseudo second order kinetic model more fitting the adsorption process.ΔH>0,it showed that the adsorption of Ni ²⁺ on CHAK was an endothermic process and raising the temperature was benefit to the adsorption process,ΔG<0 indicated that the adsorption was a spontaneous process.