In order to study the influence of different bearing types on the vibration mode and self-oscillation period of the structure, a stadium in Xi'an is modeled by using the finite element analysis software SAP2000, and the modal characteristics of the large cantilever truss and mesh frame combined structure with rigid articulated bearing and elastic bearing are investigated under the two types of bearings. The results show that the difference between the self-oscillation frequency of the fixed-hinge bearing model and the elastic bearing model is large, compared with the elastic bearing model, the first-order self-oscillation frequency of the fixed-hinge bearing model is reduced from 1.587 41 to 1.125 8, which is 41.0%, and the frequency fluctuates a lot; the modal vibration pattern of the elastic bearing model has uniform distribution of the overall stiffness, which is an integral vibration, and the first vibration pattern of the structure is dominated by the vertical vibration in the Z direction, and the vibration pattern-frequency curve is dominated by the vibration pattern-frequency curve. The first vibration mode of the structure is dominated by vertical vibration in Z-direction, and the vibration mode-frequency curve is more gentle, which is more suitable for the combination structure of large cantilever truss and net frame.