As an important supporting component of thrust bearing of hydropower plant, the elastic oil sump plays a vital role in the safe operation of the hydropower plant. Considering the complicated working conditions of the elastic oil sump, it is of great significance and convenience to use a method of CAE to simulate the actual working state of it. In literature, many researchers have investigated static behaviors of the elastic oil sump. However, a dynamic analysis of the oil sump has been seldom investigated formally yet. Therefore, in this study we particularly focused on investigating the dynamic behaviors of a single corrugated elastic oil sump. In this study, the finite element model of the studied oil sump is built with reasonable simplifications of the working status. Then, static and dynamic analyses of a single corrugated elastic oil sump are performed by the means of ANSYS software. Performance parameters of the sump, the initial oil pressure and dangerous region are determined through the static analysis. In the dynamic analysis, the time-history curves of VM equivalent stress and 1st /2nd/3rd principal stress of a tracked node in the crucial region are obtained. The results showed that the method of finite element analysis (FEA) suits well in the study of the stiffness properties of the elastic oil sump and the stress cycle is big enough to induce fatigue damage to which should be paid close attention.