A method was developed for analysis of thiocyanate(SCN-) pollutant in milk powder samples on an IonPac AS19 column using KOH gradient elution-ion chromatography/conductivity detection with a conductivity suppressor.The experimental conditions,including sample preparation,chromatographic conditions,were investigated. Under the optimal conditions,the calibration curve was linear in the range of 002-100 mg/L,with correlation coefficient(r) of 0.999 9.The limit of quantitation(LOQ,S/N=10) was 0.3 μg/g.The recoveries were in the range of 99%-102%.The method was reproducible,and the inter-RSD(n=7) for peak areas was 1.6% in the random detection of 2.0 mg/L standard solution in 3 d.