The polyethylene (PE) membrane for adsorbing uranyl ion was prepared by radiation-induced grafting ot acrylonitrile (AN) onto PE hollow fiber, and its subsequent amidoximation on cyano groups of poly(AN) graft chains. The adsorpation characteristics fot the chelating hollow fiber membrane was examined after the solution of UO2(2+) permeated across the chelation hollow fiber membrane. The inner and outer diameter increased with increasing grafting yield, whereas the pure water flux and pore diameter decreased with increasting grafting yield. The adsorption of UO2(2+) by the chelating hollow fiber membranes increased with increasing amidoxime group. The adsorbed amount of UO2(2+) by the chelating membrane was higher in uranylacetate soluting than uranylnitrite solution. Amidoxime group-chelating fiber membrane showed a high seletivity for UO2(2+) in the presence of Na(1+) and Ca(2+) even through there is a high concentration of Na(1+) and Ca(2+) in the inlet solution.