A novel polycarboxylate additive was prepared by the graft copolymerization of propenyl polyoxyethylene ether. The preparation method was optimized by orthogonal and single factor experiments,the product was characterized and its application properties were investigated. Results showed that the optimal synthesis method was based on the reaction among 6. 0 g acrylic acid,1. 6 g acrylamide,1. 8 g initiator,1. 0 g chain transfer agent and 35. 0 g propenyl polyoxyethylene ether at 80℃ for 2 h. The measured soli...