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The multivariable control for hydraulic looper system which has the features of nonlinearity， strong coupling and uncertainty is the difficult point in the rolling control field. In order to improve the control performance of hot continuous rolling strips， a virtual prototype model of the hydraulic looper was built by using ADAMS， then the iterative learning control(ILC)system based on a non-interactive decoupling strategy was designed by using MATLAB， thus a co-simulation model was built by using ADAMS/Sub module and MATLAB/Simulink interface. Simulation studies were made for traditional PID control system and for the designed control system on the basis of this co-simulation model.The simulation results showed that the designed control system further weakens the coupling effect between the looper height and tension， and achives better control effect of the looper system. [ABSTRACT FROM AUTHOR]