A method of high pressure ion chromatography (HPIC) for quickly determinating bromate and nitrite in drinking water was established. The contents of bromate and nitrite in the sample were determined by using Dionex Integrion high-pressure ion chromatograph, IonPac AS19 high-capacity analytical column and inhibition conductivity detector, with the eluent of KOH produced on-line by automatic generation device. The anions of bromate and nitrite could be separated by the method within 5 min with detection limits of 0.46 μg/L and 0.22 μg/L respectively. In the concentration range of 0~100 μg/L for bromate and 0~50 μg/L for nitrite, a good linear relationship was found. By adding standards to the water, the recovery of bromate and nitrite was 98.6%~101.3% and 100.1%~106.0%, respectively, and the relative standard deviation was 1.26%~4.12% and 1.69%~4.27%. This method was simple, rapid, sensitive, accurate, efficient and environmentally friendly which was suitable to determinate the trace of bromate and nitrite in drinking water.