论述了掺高效减水剂混凝土塌落度损失机理，介绍了国内外降低坍落度损失的常用方法以及本单位最新研制的几种低坍落度损失高效减水剂的性能和部分生产工艺。 The slump loss mechanism of concrete with superplasticizer was discussed. The common methods to reduce the slump loss at home and abroad as well as the properties and some production processes of several new slump loss superplasticizers newly developed by this unit were introduced.