Abstract:This paper focuses on the dynamic characteristics of the solids and water-body interaction. Firstly, we research the weight of the pure solid structure and the frequency domain, followed by combined Westergarrd theoretical methods, we use ADINA-FSI method to complete the full flow structure coupling calculation of the gravity dam. Study explores the dam body stress and water structure affect the vibration frequency at the presence of water. The result shows that: the flow structure coupling model can caused displacement smaller and better reflects the body of water - solid interaction requirements, and thus draw some valuable results for engineering design.