Abstract: An analog computation was carried out with the FEM (finite element method) software ANSYS-DYNA for the edge, spread and finish rolling processes of thick/medium plates which were rolled with different rolling parameters. The results show that after spread rolling the front end of slab plane changes to dishing from bulging with increasing edge reduction but its back end always keep the slab plane in bulging form, and the length and width fluctuations of both front and back end crops of the slab are similar to that after spread rolling. Less width fluctuation is available via edge rolling if the proportional spread is big. In order to get a favorable plane shape of plate after the whole rolling process, both the longitudinal edges of the slab after spread rolling will be kept in straight or slightly convex. The results of analog computation thus provide a theoretical reference to match rationally the edge reduction, proportional spread and elongation in finish rolling.