Abstract: By way of three-dimensional elastic-plastic finite element method based on the FEM software Marc, the strip cold rolling process on a four-high strip mill is modeled to analyze the roll deformation. In the model the deformation of both roll and strip are considered as a whole, so as to resolve the coupling problem between them, and avoid the errors due to iterative processor assumption of the distribution of rolling force. A step-by-step convergent solution is thus introduced to the calculation to provide accuracy and reliability. The effects of strip width, roll's bending force, etc., on such roll deformation as bending and arc/lateral flattening, and the gap between loading rolls are obtained with different rolling parameters. The new calculation method and reference data will offer an efficient way for analysis and control of the shape.