Abstract:In order to investigate the effect of different disinfectants on the organic matter in drinking water, surface water from Huangpu River filtrated with MF membrane was studied. There was a significant difference among organic matter variations by chlorine, chloramine and UV. The oxidation of the organic matter in the water could be divided into highspeed and lowspeed stages with the variation of chlorine dosage from 1 mg/L to 4 mg/L. AOCNOX is the majority of the AOC composition in chloride water. AOC changes had a lesser extent and peak time lag than chlorine by chloramines disinfection. Irradiation by lowintensity UV (0.038 mW/cm2) had no effect on the AOC change. When AOC varied with the changes of UV dosage by highintensity(0.076 mW/cm2 and 0.153 mW/cm2), the changes of AOCP17 were consistent with AOC, and had no changes of AOCNOX.