Abstract: Base on the optimum method of controlling chaos dynamical behaviors, by the feedback of transient small accessible parameter perturbations in optimum control process, chaos in the unbalanced flexible rotor system with the nonlinear unsteady-state oil-film force is rapidly directed to a expectative orbit of an infinite number of unstable periodic orbits which are embedded within the chaotic attractor and stabilized, The numerical result shows that the chaos in the dynamical film-flexible rotor system is also to be able to control efficiently.

Key words: Chaos, Control Parameter perturbations, Dynamicalfilm, Rotor