Abstract: In this paper, aiming at the vibration characteristics of a large annular aluminum alloy part, a three-dimensional model is established, and the modal analysis and harmonious response analysis are carried out based on finite element software. The natural frequencies and vibration modes of annular aluminum alloy parts are obtained from the modal analysis results. On the basis of modal analysis, the harmonic response analysis is carried out, and the response curves of displacement and frequency, acceleration and frequency are obtained, and the resonance phenomenon in the range of 0~140Hz is analyzed. The analysis conclusion provides an important theoretical reference for the selection of vibration aging process parameters of large annular aluminum alloy parts, and has certain engineering application value.