Aminated polystyrene-based chelating resins were prepared by chloromethylation of styrenedivinybenzene copolymer(DVB 3%), followed by the reaction with amines such as diethylenetriamine(A₂₃), triethylenetetramine(A₃₄), and tetraethylene-pentamine(A₄₅), respectively, Graft poly(styrene-g-ethyleneimine) chelating resin(MH resin) was synthesized by the reaction of chloromethyated copolymer with 2-methyl-2-oxazoline, followed by alkali hydrolysis, The carboxymethylated chelatin resins were also prepared by carboxymethylation of the aminated resins with monochloroacetic acid, and adsorptivities of the heavy metal ions such as Hg⁺⁺, Pb⁺⁺, Cd⁺⁺ and Cr⁺⁶ ions to these chelating resins were investigated. In the case of Hg⁺⁺ ions, all the aminated resins showed high adsorptivity (>95%) and adsorptivities of the metal ions at pH range 4.5∼7.0 to A²³, A³⁴, and A⁴⁵ resins were in the following order: Hg⁺⁺>Cr⁺⁺>Cd⁺⁺>Pb⁺⁺. However, to MH resin, the order was altered as follows: Hg⁺⁺>Pb⁺⁺>Cd++>Cr⁺⁶. Comparing the adsorptivity of the carboxymethylated resins with the aminated resins, it was concluded that the adsorptivity of Cr⁺⁶ ion was improved remarkably by introducing carboxymethyl group, but to Hg⁺⁺ and Cd⁺⁺ ions adsorptivity were not improved, and it was also observed that the adsorption of Hg⁺⁺ ion to the aminated resins was not affected by the presence of Na⁺ and Ca⁺⁺. It was noteworthy that the carboxymethylated chelating resins containing the ligand of the similar structure to EDTA in the side chain showed the following adsorptivity order in agreement with the order of the stability constants of these metal ions to the low molecular weight EDTA i.e.: Hg⁺⁺>Pb⁺⁺>Cd⁺⁺.