Based on ANSYS Workbench 15.0 finite element analysis software, the finite element models of two kinds of generator with the composite cantilever structure and multilayer cantilever structure were established in this paper. The static, modal, transient dynamics and harmonic response characteristics are analyzed, and the generation capacity and resonance frequency band of two kinds of generator were compared. The results show that the power generation capacity of the generator with composite cantilever beam structure is better than that of multilayer cantilever structure under the same constraint condition. Moreover，the resonance frequency band of composite cantilever beam structure can be extended from one point to a range.