Abstract: Chitosan-g-N-carboxymethyl-2-sulfo-4,5-2H imidazolinone(CSIDZ) with different grafting ratio polymers were synthesized with 2-bromoacetic acid,chitosan,2-sulfo imidazolinone as raw materials.Their physical and chemical characteristics were studied.Adsorptions of synthesized polymers for metal ions,such as,Cd²⁺,CrO₄^2-,Fe³⁺,Cu²⁺,Pb²⁺ were determined with EDTA complexometric titration.The antibacterial activity of the grafted polymer was examined against a series of test microorganisms by quantitative suspension method;corrosion inhibition efficiency of the synthesized polymer in 1 mol/L HCl solutions for N80 steel panel was measured by mass-loss method.Results from the experiments indicate that the partially grafted CSIDZ made the complexing action of partially grafted CSIDZ to most tested metal ions higher thermal stability than small molecule-CSIDZ,the grafted polymer bears a relatively strong antibacterial activity,its MIC(minimal inhibited concentration) is 5.10 g/L and it has a higher thermal stability than small molecule inhibitor CSIDZ.Its inhibition efficiency still amounts to 71.1% when temperature reaches to 90 ℃,and the amount used is only 1/2 that of CSIDZ.