The N-thiamido chitosan introduced the thioamide ligands at C-2 postition of glucose rings was synthesized by the reaction of crosslinked chitosan hydrochloride with ammonium thiocyanate. The mercapto deoxy chitosan introduced the thiol ligands was prepared by the reaction of crosslinked chloro deoxy, chitosat which was substitued chlorine at C-6, with thiourea, followed by the hydrolysis. The thiosemicarbazide derivatives of crosslinked chitosan was also sythesized by the reaction of crosslinked chlorodeoxy chitosan with ammonium thiocyanate in dimethylformamide, followed by the addition reaction of hydrazine. The structures of these chelate polymers introduced from sulfur derivatives ligands were conformed by the elemental analysis and infrared spectrum. The adsorption characteristics of chitosan-based chelate polymer towards 100 ppm solutions of various metal items such as Cu(Ⅱ), Cd(Ⅱ), Pb(Ⅱ), Hg(Ⅱ), Cr(Ⅵ) and U(Ⅵ) were examined at different pH value by batch method. The adsorptivities of metal ions such as Cd(Ⅱ), Pb(Ⅱ), Cu(Ⅱ) and U(Ⅵ) to the thiosemicarbazide derivatives chelate polymer increased with the contents of sulfur ligand introduced and the increase of pH value of metal ion solution, however, Cr(Ⅵ) ion showed reverse tendency above pH 3. In the case of thiol and N-thioamide derivative of chitosan the adsorptivities of these metal ions were similar to that of thiosemicarbazide derivatives. The adsorptivities of Hg(Ⅱ) to these chelate polymers, introduced sulfur derivatives ligands were showed excellent affinity to the Hg(Ⅱ) ions, were above 100% regardless of pH variations.