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 002-100 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.