Using standard test method for basic performance of cement to research the effect of fineness and dosage of polya-luminium chloride waste residue（referred to as composite chlorine removal PAC waste residue） treated by chemical calcina-tion method on cement properties such as water requirement of standard consistency,setting time and strength.The results showed that with the finer fineness of the composite dechlorination PAC waste residue,the standard consistency of cement required more and more water,the cement setting time was gradually shortened,and the strength enhancement effect on ce-ment was weaker.The practical fineness of the composite dechlorination PAC waste residue was at 1.5%~2.5% of the sieve residue of the pore size 80 μm sieves.With the gradual increase of the amount of humidification composite dechlorination PAC waste residue of practical fineness,the compressive strength of cement 28 d first increased and then decreased.At the dosage of 17%,the growth rate of cement 28 d compressive strength showed a critical value.