Abstract: Nonlinear thermal coupling FEM was used to investigate the temperature field and thermal deformation of roll sleeve during twin-roll strip casting. The distribution disciplines of casting roll temperature and hot deformation were figured out in the steady casting stage. The influence of casting velocity on the distribution disciplines of casting roll temperature and hot deformation was analyzed. It is concluded that during the steady casting stage, the casting roll temperature only fluctuated on the surface of the casting roll; however at the core, the temperature was fairly stable. The lower the casting velocity, the larger fluctuation amplitude was.