Abstract: The fluctuation of rolling speed and the torsion variation of the main drive shaft are inevitable in the rolling process,which leads to the rolling skid between the roll and the strip. The skid will significantly influence the surface quality of the strip. The dynamic rolling skid model was established for the drive system of Sendzimir twenty-high roll mill. The characters of torsion vibration were analyzed based on the different rolling speeds and friction coefficients. The simulated results were agreement with the experiment results,which not only validates the effectiveness of the established model,but also provides a new model for analyzing the fluctuation of the torque.