Abstract: This cluster of carboxylic acid introduced the research development present stuation,and describes the molecular structural features and synthetic methods of the polycarboxylic acid superplasticizer, and also describes the mechanism of the polycarboxylate superplasticizer. Respectively using two methods (the synthesis of polyether and polyester-type water-reducing agent for synthesis of water-reducing agent) to synthetic water-reducing agent, and analyzed the factors affecting the performance water-reducing agent. Such as the synthesis of polyether-based water-reducing agent, by adding the less amount of monomer APEG50 , the viscosity of superplasticizer increase ,and the cement paste test to maintain reduced. AN adding more water reducer greater the viscosity of cement decreased the flow. The more MAn adding,the the viscosity of superplasticizer reduced, When the amount of MAn is 5.6g, lead the largest pulp fluidity, indicating an appropriate amount of MAn can promote the mobility of water reducer. Adding cationic monomer (45% DAC solution) or cross-linking agent (PEG2000) were the mobility of variation of cement. Water-reducing agent in the polyester synthesis, by adding monomer AA and MAA were to make cement mobility variation,.Esterification fluid acid-base properties also has an influence on cement mobility.…