Objective To establish a simple and rapid method for the detection of sulfur dioxide residues in foods by ion chromatography.Methods Selecting a Metrohm 861 pairs of suppressed ion chromatography,a Metrosep A Supp.4-250 analytical column,eluted by 3.1mmol/L Na2CO3-1.0mmol/L NaHCO3,and using a conductivity detector.After the sample being crushed,sulfur dioxide in the sample was distilled and oxidized by 3% hydrogen peroxide to sulfate,and determined by ion chromatography.Results A good linear relationship was observed in the range of 0-266.76 mg/kg,the linear regression equation was y=10.126 x + 0.232,correlation coefficient(r) was 0.999 7,the recovery was in the range of 91.61%-98.41%,the relative standard deviation(RSD) was less than 5%,the detection limit of the method was 0.067 mg/kg.Conclusion The ion chromatography method in the detection of sulfur dioxide in foods is simple,precise,strong reproducible and accurate.