The effect of the base saturability, the dosage and the temperature of coagulation of PAC on the grey water of paper industry has been studied. The result show s that: as far as the PAC in accordance with the GB standard is concerned, its specif ic base saturability has a greater effect on the grey w ater of paper industry. T he treatment of the grey w ater of paper industry f rom Xihuafeng, Wuzhi, Henan province has been stated as follows:When the dosage of PAC w ith 75% of base saturability is 0. 6 g / L w ater, the removal rate of COD is 69%, removal rate of SS is 84%, the treated w astew ater can meet the requirement of the discharging standard