First ly depending on theoretical analysis, this paper suggests that chlorine dioxide(ClO₂)in stabilized chlorine dioxide aqueous solution(stabilized solution)has a different existence form because of the dif ferent stabilizer used.On the basis of the analy tical results of inf rared spectromet ry, paper chromatog raphy, tyrosine color development reaction and the assay of anti-acid buffer capability, we confirm that chlo rine dioxide in stabilized solut ion wi th sodium percarbonate as stabilizer exists in the form of chlorition (ClO₂ -)and exist s in NaHCO₃ - Na₂CO₃ buffer system.When the stabilizer is sodium perborate, chlorine dio xide may be retained in the solut ion comprised of H₃BO₃ -Na₂B₄O₇ as a labile complex.The results related above w ill have impo rtant guide ef fect on product, sto re and application of stabilized chlorine dioxide solution.