Abstract: In this paper the data transfer antenna with cantilever waveguide is taken as the research object. First, the modal analysis is carried out respectively for the fixed cantilever waveguide and the cantilever waveguide not fixed while the external installation surface is fixed. Secondly, under the same sinusoidal vibration condition, the antenna is analyzed by finite element method and the stress cloud diagram and stress response value of the antenna are obtained. It is found and verified that the modal response and the stress of the data transfer antenna are much different in two different processing modes, which provides theoretical and experimental basis for the subsequent selection of the optimal structure.