With reference to the structural style of inland river pier beam slab terminal, combining with practical engineering, and using the finite element analysis software, we establish the bent model with pier structure,conduct the modal analysis, and obtain the natural frequency and corresponding vibration model. According to the mechanical characteristics of the pier structures, we analyze its weaknesses and find out that under the high frequency incentive of vehicles or quay crane’s vertical load, a greater displacement will occur. This provides a basis for further dynamic analysis, structure condition assessment and research of reasonable structure types.