Determination method of chloride ion and sulfate ion in polyethylene glycol electrolytes powder by ion chromatog. was established.Chromatog. column was Dionex IonPac AS11-HC anion anal. column (250 mm×4 mm, 4μm), eluent was KOH, flow rate was 1.0 mL·min-1, injection volume was 10 μL, detector was conductivity detector, suppressor was Dionex AERS500 (4 mm), suppression current was 50 mA.After verification, the specificity, linearity, repeatability, accuracy and durability of the method were good.The method is suitable for determination of chloride ion and sulfate ion in polyethylene glycol electrolytes powder.