Taking Chlorella as the research object,we studied the removal effect of aluminum sulfate,polyalumi-num chloride(PAC)and polyferric sulfate(PFS)on algae under different dosage,pH value and potassium per-manganate pre-oxidation conditions.The results showed that PAC had the best removal effect on algae.When PAC dosage was 25 mg/L,pH was 8.0,potassium permanganate usage was 0.8 mg/L,and pre-oxidation time was 30 min,the removal rate of Chlorella could reach 93.73%.