Chelating forming groups were introduced into the polymer chains grafted onto a porous hollow-fiber membrane for Sb ion remove in waters by radiation-induced graft polymerization and subsequent functionalization of a monomer containing an epoxy group, Moreover adsorption characteristic and different pH of Sb ion by n-MG membrane were researched. The breakthrough curves overlapped independent of the permeation pressure, residence time. This indicates a negligible diffusional nass-transfer resistance of Sb ion to the chelating forming gruops. Moreover the adsorption capacity of each n-MG membrane appeared the highest around pH 7.