Abstract: In recent years, with the development of modern rolling mill equipment level, rolling mill vibration becomes more and more outstanding and diverse and has become a worldwide problem needed to solve in the rolling field. After the vibration test of an ASP hot strip mill made in AnSteel, a CSP hot strip mill made in an SMS company and a FTSR hot strip mill made in a Danieli company, we find that the frequency of a rolling mill torsional vibration and is identical with that of an axial vibration. In order to explain this phenomenon of mill axial vibration, the paper conductes a computer simulation analysis by an ANSYS finite element harmonic response analysis module, and the conclusion is obtained that the torsional vibration and axial vibration will produce the phenomenon of coupled vibration under certain conditions, which provides the theory basis for the design of rolling mill coupling dynamics.