Abstract: A new monitor automatic gauge control (AGC) system is applied to a hot finishing mill in an aluminum plant, using thickness deviation distribution strategies that are dynamic during the process of correcting thickness deviation. Based on the distribution rule for reasonable thickness deviation deduced from the rolling theory combined with the control strategy for the new monitor AGC system, we deduce a calculation formula for thickness deviation distribution coefficients. This formula is directly used by a controller to solve a problem in which the thickness deviation distribution coefficients cannot fit the variation in rolled aluminum alloy grades to provide a reasonable thickness deviation redistribution. We apply the improved thickness deviation distribution coefficients in the new monitor AGC system for rolling strips with different specifications. The results show that the improved coefficients can adapt to the change in rolled aluminum alloy grades, thereby enabling the new monitor AGC system to provide reasonable thickness deviation redistribution for facilitating shape control based on the maintenance of the distribution ratio of the rolling force constant. This approach takes full advantage of the reasonable thickness deviation redistribution of the new monitor AGC system.