Abstract: A simple adaptive control system was designed for constant tension of double stand revere cold rolling mil.l This system contains two inner loops for current and velocity control using PI regulators; its outer loop is for tension control using simple adaptive controller. Simulation results indicate that the simple adaptive controllerhas betterperformances than classicalPID controlmethod. The system has stronger robustness for constant force contro,l and improves the precision about the thickness and shapes of steel strap