Polycarboxylate superplasticizer can produce ideal water reduction and reinforcement effect when the dosage is low, less influence on concrete setting time, better slump retention, and adaptability to cement/mixture It is relatively good, has little influence on the shrinkage of concrete (refers to usually does not excessively increase dry shrinkage), does not use formaldehyde in the production process and does not discharge waste liquid, low content of sulfonate and chloride ion, etc. A new generation of water reducing agent after melamine, aliphatic and sulfamate water reducing agents. The polycarboxylic acid-based water reducing agent has a high water-reducing rate, excellent moisture retention performance, and good adaptability to cement, but its application range is limited due to its high price. By compounding, the price of the water reducing agent can be reduced, and some aspects of its performance, such as early strength, retardation, deflation, and defoaming, can be enhanced.