Metal plate and strip of different variety and different width require different primordial crown of roller. In practical process, the crown is designed by trial and accumulative experience, leading to low efficiency, high cost and big error. The paper sets up a mathematic model for forecasting the primordial crown of the roller in rolling metal plate and strip with different variety and width. The model is optimized and then practiced. The results show that the model adapting sinusoidal curve to forecast the roller crown can obviously reduce the double-rib wave and thus improve the flatness of the plate.
