Amidoxlme type chelate resin was synthesized though the amidoximation of Polyacry-lonitrile(PAN) fiber. Best amidoximation condition of PAN fiber was determined by changing the several amidoximation condition (reaction time, temperature and the concentration of hydrosylamine solution). The cyclization side reaction was proposed, and the cyclization mechanism was modelized. Amidoxime type chelate resin derived from PAN fiber has an excellent adsorption capacity for Cu+a, Cr+2, Pb+a.