Abstract: The dynamic contact behaviors of 20-high Sendzimir mill rolls by Adams simulation technology, where the distribution characteristics of contact loads between different rolls are identified by comparing with static contact analysis. Besides, the risk of failure in critical rolling mill components induced by dynamic contact is clarified, and the influences of rolling force amplitude-frequency characteristics on the contact interactions between different rolls and those between the rolling bodies and races in backing bearings are revealed. The results show that the maximum contact force occurs between the work roll and the first intermediate roll, while the minimum contact force exists between the inner second intermediate rolls and the support rolls. The dynamic contact forces between different rolls are significantly higher than the corresponding static ones. The distinct contact loads across the second intermediate rolls and their corresponding support rolls result in significant variations in the contact loads between rolling elements and races within the backing bearings on different support rolls. The load on the rolling bodies in the backing bearings on outside support roll is notably higher than that on inner one. The inner races of backing bearings on outside support roll are more prone to failure. With an increase in the rolling force amplitude, the root mean square and fluctuation values of the contact forces between the different rolls increase in a linear way. The dynamic contact forces between various contact pairs also exhibit significant frequency dependence, and their fluctuation magnitudes are consistently far greater than the results by static analysis. This research provides an important theoretical reference for service evaluation and performance optimization of 20-high Sendzimir mills.