Abstract: A new cationic polymer，epicholorohydrin-dimethylamine polymer（EPI-DMA）as intercalary reagent was used to prepare a series of cationic polymer/bentonite （EPI-DMA/Bt）nanocomposite adsorption material.It was shown by the characteristic analysis that the surface area and degree of aggregation of the modified bentonite greatly increased as compared with that of unmodified bentonite and ξ electric potential changed from negative to positive. The adsorption of reductive reddish R, disperse reddish S-R,and activated reddish violet K-2BP on the EPI-DMA/Bt were also studied. The results indicated that the decoloration of three orcein dyes on EPI-DMA/Bt were much better than on Na-Bentonites. The relationship between adsorptive capacity (q_e) and equilibrium concentration (C_e) fitted the isothermal adsorption equations of Langmuir and Freundlich. The adsorption dynamics followed the law of Langmuir equation.