Abstract: In order to improve the setting calculation accuracy of the cold rolling force model, reduce the length of the thickness deviation at the head of the strip, and improve the yield of the strip, basic chimp optimization algorithm is improved. And then, it is used to dynamically adjust for the deformation resistance and friction factor that affect calculation of rolling force, so as to find the best rolling force calculation model. The simulation experiment results show that by the optimized model, the deviation between the set rolling force of each stand and actual value is not more than 2.12%, and its standard deviation is reduced from 10.4% before optimization to 1.2%. Practice production proved that the proportion of the thickness deviation length of the strip head less than 20 m after rolling force optimization has increased from 35.84% before optimization to 60.2%. It is proved that the method can significantly improve the prediction accuracy of the rolling force model and improve the yield of the strip.