Abstract: Either RF-AGC or Mon-AGC of AGC (automatic gauge control) model to the 1580 hot strip rolling mill belongs to a feedback control system. Time lag is therefore inevitable to the readjustment of rolling gap, thus resulting in the constraint on improving the strip gauge precision. The normal feedforward idea about tandem cold mills was introduced into hot strip rolling to develop a feedforward AGC model via the calculated strip thickness from the exit preceded stand, which was taken as the inspected gauge in feedforward control and processed by tracking shift. In this way the rolling gap can be readjusted in time according to gauge fluctuation so as to attain the goal of precontrol. As a result, the thickness gauge precision of rolling strip is improved obviously.