Abstract: The essence of both automatic shape control (ASC) and automatic gauge control (AGC) is the controlling of loaded gap between rolls, so the closed control loops of ASC and AGC are coupled. The coupling between ASC and AGC holds down improvement of the combined controlling quality of ASC and AGC heavily. After the coupled process control model was developed, a feedback decoupling controller was proposed to decouple the model. The simulation result is perfect and indicates that the cross coupling between ASC and AGC especially the disturbance from AGC to ASC was depressed, which ensures the quality of the decoupling controller.