Steel-plate shape control method

The present invention relates to a method for controlling steel plate shape. The method improves the steel plate shape by improving the stability of the roller system of a rolling mill and optimizing pass rolling pressure and straightening parameters of a straightening machine with eleven rollers. The method is a novel plate shape controlling method aiming that the flatness of WDB620 steel plates conforms to the standard but can not meet the requirements of users, and solves the perplexed problem of the WDB620 steel plate shape for a long time. The qualification rate of the WDB620 steel plate shape is improved to 97 percent from less than the prior 60 percent, so that the method can create benefits of more than 5 millions for enterprises every year.