Fly ash polluted in Fukushima was treated by washing water and then the radioactive waste water was decontaminated with zeolite polymer composite fiber. The character was compared in zeolite, prussian blue and the composite fiber. The strong alkali condition of the radioactive waste water damaged in PB, while zeolite and the composite fiber successfully treated the radio-Cs by sorption process of batch and column experiments. The ability of the composite fiber was superior performance in the time course of the sorption process. The radioactive Cs binding to the composite fiber and zeolite was followed in Freundlich mechanism, showing multibanding to their adsorbents in the extra-diluted condition, but, each adsorbent obeyed saturated mechanism for non-radioactive Cs.