The biomass of nonliving, dried marine brown algae U. pinnatifida, H. sisiforme, and S. fulvelum harvested in the sea near Cheju, were studied for their sorption performance and selectivity of copper, zinc, lead, and chromium. The metal uptakes by biosorbent materials increased with increasing pH in the range of Cⁱ 10-500mg/L. The metal uptakes by biosorbent materials decreased in the following sequence : Pb>Cr>Cu>Zn. Among the biosorbent materials the decreasing order was as follows : U. pinnatifida≥H. sisiforme>S. fulvelum for copper and zinc; U. pinnatifida>H. sisiforme>S. fulvelum for lead and chromium. The metal uptakes(except for lead) by biosorbent materials in the mixed solution, decreased greatly in comparison to those in the single solution.