This paper is study on the adsorption performance of chitosan for copper ions in conditions of different amounts of chitosan, different times, different temperatures and different pH. The results show that the best adsorption conditions is chitosan concentration of 6.4 ∼ 8.0g/L; adsorption time of 10min; adsorption temperature of 38°C; pH=6. The kinetic equation of chitosan adsorption for copper ion is y = 0.2048×Ln (x−0.495) + 99.495. The largest adsorption percentage of Cu (II) by chitosan is 99.7% for 100mg/L Cu (II) aqueous solution.