Abstract: In the prediction process of rolling force for plates, to prevent the self-learning coefficient from the skipping along thickness layers, a self-adjusting method was put forward in the self-learning process of the rolling force for medium/thick plates. In the method the half-width zone was calculated according to every thickness node as listed in the table of thickness layers, then the range of validity of a thickness node was calculated according to half-width zone so as to find out the validating range of the thickness during rolling and determine the weighted value corresponding to the relevant thickness node, thus giving the self-learning coefficient after self-adjusting. Practical applications showed that the method proposed is available to improve the prediction accuracy of rolling force and plate shape control greatly and worthy to apply to plate rolling.