Abstract: In the plate rolling process some asymmetrical rolling conditions may change the balance of roll system and affect the transversal thickness distribution of workpiece, thus resulting in abnormal crown distribution and the workpiece which deviates from normal rolling direction. Eventually, the plate shape will be poor with inaccurate size. Based on the assumptions of cantilever beam and semi-infinite elements with the work roll flattening taken into account, an influence function is derived to calculate the transversal thickness distribution of workpiece. By the calculation and analysis of rolls and workpiece, a quantified relation between the transversal thickness of workpiece and asymmetrical rolling conditions is obtained. Such a calculation of transversal thickness is of significance to avoiding side camber and improving the rate of finished products.