Abstract: With the development of urban, city space becomes less and less, and underground space is used more and more. However, it is concerncd with dynamic change of underground water, which often brings about series of geotechnical engineering problems. And anti-floating evaluation of underground structure is one of the significant questions. Regarding this, clear rules haven't been given by existing criterion, and people's attitude on it is also quite different. And the systematic experiment is less than theoretical research. This article introduces the whole idea, tester design and actualization process of the model experiment for uplift action mechanism of underground water.