In this study, ion-exchange fibers to create a cartridge-type, and its adsorption properties were investigated. Properties for the purpose of the test formulation with ion-exchange fibers and nonwovens, respectively, 7:3 and 8:2 were produced as a filter. It was shown that as for adsorption of magnesium and calcius ions by ion-exchange fiber, magnesium ion is slower than calcium ion in the each solution. Also, in the mixture of the magnesium and calcium ions, the adsorption rate of magnesium ion was much slower than that of calcium ion. Finally, Ion-exchange fiber filter has a high adsorption capacity for 6-7 hours and a recycling capacity for 6-7 times, therefore it would be possible to be applied to water treatment.