Macroreticular chelating resins containing, amidoxime groups were synthesized by aqueous suspension copolymerization of acrylonitrile (AN) and divinylbenzene (DVB) and subsequent chemical modification of cyano groups by reaction with hydroxylamine. In the copolymerization, the effects of divinylbenzene proportion and dilution degree on the copolymer pore structure were investigated. Gelatin and calcium carbonate were used as suspension stabilizers and sodium sulphate was added in order to reduce acrylonitrile solubility in water, by salting out effect. The copolymers (AN/DVB) and amidoxime resins (RNH/DVB) obtained were characterized by apparent density, surface area, pore volume, optical appearance, surface morphology and by nitrogen content. The amidoxime resins were finally evaluated in relation to the complexation capacity of copper ion.