Abstract: The study was in order to solve the problem that the effect of treatment by coagulation single was not satisfied at low temperature. In the study, the best dosage of the coagulants and effect of the coagulation due to the way of adding, and the effect of coagulation-activated carbon at low temperature were analyzed. The results showed that at normal temperature (20-30℃), the effect of BAC was best , the removal of CODCr, chromaticity and TP by BAC were 51.44%, 75.00% and 93.48% when its concentration was 100mg/L. With comparison, there were 31.60%, 50.00% and 75.36% at low temperature (10-15℃). After the coagulation-activated carbon was used, there would be higher removal when the activated carbon was added before PAC, and removal of CODCr could be 73.80% when the concentration of activated carbon was 20mg/L.