According to the reality and application requirement of pier bases in the workshop of the Xiacheng Hydropower Plant,the paper sets up a 3-D finite element model,researches on the dynamic characteristics of pier base and,with the ANSYS software,compares the impacts of different intercepted boundaries of numerical value models to the harmonic analysis of pier bases.

According to the actual condition and application request of the pier base of powerhouse for Xiacheng Hydropower Station in Taohe River,this paper establishes the analytic model by the three-dimensional finite element method.