A chelating microporous membrane was prepared by grafting of an epoxy-group-containing glycidylmethacrylate(GMA) onto a microfiltration membrane by applying radiation-induced graft polymerization and subsequent modification with ethylenedi-amine(EDA). At this experiment, we used the membrane of dg 190%(dg=degree of grafting). The resultant membrane had an immobilized EDA density of 0.33mol/kg. Permeation of copper solution(10g-Cu/m³, pH=3.0) through the chelating microporous membrane minimized the diffusional path of the copper ion to the immobilized EDA.