In the hot strip rolling control system,the temperature distribution and deformation resistance are the main parameters affecting prediction of rolling force.In order to improve the model prediction precision,an optimization algorithm based on objective function was put forward,in which the penalty function index was adopted.During the adaptation process,the temperature distribution and deformation resistance were taken as the optimized parameters,and the Nelder-Mead simplex algorithm was used to search the optimal solution of the objective function.Furthermore,the temperature adaptation and force adaptation were solved simultaneously.Application results show that the method can improve the accuracy of the rolling force model obviously,and it can meet the demand of the industrial production and has a good application prospect. In the hot strip rolling control system, the temperature distribution and deformation resistance are the main parameters affect prediction of rolling force. In order to improve the model prediction precision, an optimization algorithm based on objective function was put forward, in which the penalty function index was adopted. During the adaptation process, the temperature distribution and deformation resistance were taken as the optimized parameters, and the Nelder-Mead simplex algorithm was used to search the optimal solution of the objective function. Stillrther, the temperature adaptation and force adaptation were solved simultaneously. Application results show that the method can improve the accuracy of the rolling force model obviously, and can can meet the demand of the industrial production and has a good application prospect.