Abstract: In multi-variable systems,performance of feed-forward decoupling depends on system model.Feed-forward decoupling based robust control strategy is proposed to guarantee the decoupling performance when system parameters changing.For combined shape and gauge system in the process of continuous rolling,a feed-forward decoupler is designed based on experience mathematical model,then a robust controller is designed for the decoupled multi-variable system.Multi-variable system control is used to inhibit the influence of every uncertain factor which breaches decoupling performance.Anti-jamming capacity experiment is put forward to the disturbance signal which maybe exist in the actual system,and anti parameter perturbation experiment is put forward to uncertainty of system parameter.Simulation results show good decoupling performance.It also illuminates the effectiveness of the proposed strategy.