The actors of influence in using bentonite to adsorb Pb~(2 ),Zn~(2 ),Cr(VI),Cd~(2 ) were discussed.The adsorption was tested under laboratory conditions as a functions of pH,adsorption time and quantity of bentonite.The results of this research show that the adsorption capacity of bentonite to Pb~(2 ),Zn~(2 ),Cd~(2 ) is better than to Cr(VI) and the adsorption capacity strongly depends on pH.The research also indicates that the adsorption form may be mainly surface complex and ions exchange.