Abstract: The adsorption of bentonite and modified bentonite for Pb²⁺、Cu²⁺ was researched in this paper.The result show that adsorption ability of modified bentonite is good comparing with bentonite.The removal ratio of Pb²⁺、Cu²⁺ by modified bentonite can reach greater on 97.3%\98.2% under following conditions:temperature is 30;pHis6;initial concentration is 25mg/L;dosage of modified bentonite is 15mg/l;the adsorption time is 45min.The residual concentration of Pb²⁺、Cu²⁺ is less than the national effluent concentration.