Microporous hollow fiber membranes containing cation-exchange group were prepared by radiation-induced graft ploymerization of glycidylmethacrylate(GMA), subsequently, the epoxy group produced in the GMA-grafted hollow fiber was converted into sulfonic acid group(SO3H). Followed Ni(2+), Cu(2+) metalic ions were complexed to the sulfonated membranes. The ammonia solution was forced to permeate across the hollow fiber sulfonated membrane and metal-complexed membrane, respectively. These fibers were evaluated to measure the pure water flux and the adsorption capacity of ammonia ions. The pure water flux was decreased with an introducing sulfonic acid groups, but the flux of the metal ions adsorbed hollow fiber was improved. The sulfonated fiber having higher adsorption capacity than metal-complexed fiber.