Hydroxyapatite (HAP) can fix Pb^2+ in solution and soil effectively. The absorption characters of HAP to Pb^2+ were investigated, and the initial concentrations of ions, the HAP dosage, the reaction time and the mutual effects between ions were also discussed. The results demonstrated that HAP can adsorb Pb^2+ the most effectively when initial concentration of Pb^2+ 500 mg/L, HAP dosage is 5 g/L, and adsorption time is 40 minutes. When HAP absorbs ions in the Pb^2+-F- solution, the change of Pb^2+/F- mass concentration ratio has great i...