求文介绍了一种新型水下不分散混凝土外加剂的配方研制及其试验方法，新拌混凝土的水下不分散性、可施工性及硬化后的物理力学性能与耐久性。简介了这种混凝土在两个工程中的应用实例。 This paper introduces the formulation and test method of a new type of underwater undispersed concrete admixture, the underwater non-dispersibility of fresh concrete, the workability and the physical and mechanical properties and durability after curing. Brief introduction of this kind of concrete application in two projects.