Polycarboxylic acid series superplasticizer (liquid) is the third generation superplasticizer developed after common superplasticizer represented by calcium xylate and naphthalene series superplasticizer. It is the most advanced superplasticizer in the world with the highest scientific and technological content, the best application prospect and the best comprehensive performance. PC polycarboxylic high performance water reducer is the most advanced water reducer product in the world. The performance comparison with similar products at home and abroad shows that PC polycarboxylic high performance water reducer has reached the advanced international level in terms of technical performance index and cost performance ratio. The common descriptions of the performance of polycarboxylic acid water reducer are: high water reducing rate, good adaptability to cement, good concrete and workability, and no loss of one hour slump, etc. In fact, the composition of cementitious materials is complex and changeable. From the point of view of adsorption-dispersion mechanism, any admixture can not adapt to all situations. The good adaptability of polycarboxylic acid admixture and cement is also compared with naphthalene water reducer.