The nonlinear vibration response of structural members is an important basis for cracking resulting structural damage identification, and choose the right model for accurate calculation of this non-linear vibration response is critical. According variation during vibration cracks in structural rigidity of the existing breathing crack model were analyzed and summarized, and select two models with a typical representative to bring crack cantilever forced harmonic vibration, for example, comparative analysis of the two the spectral characteristics of different types of models at different excitation frequencies and crack depth structural response. The results showed that: wire-type breathing crack model under the same conditions are more vulnerable to high-frequency component and the resonance phenomenon is more curved breathing crack model, to better characterize the crack breathing effect during vibration of.