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A fuzzy imbalanced force estimator and feed-forward controller designed by the knowledge of rotor dynamics for a single active magnetic bearing suspended rotor system was proposed to eliminate the unbalancing vibration of rotor in the paper. The variable parameters used in the fuzzy estimator are displacement and velocity of the rotor and control current of the magnetic bearing. Based on the estimating signal, a feed-forward control system is set to suppress the unbalancing vibration. The simulation and experiment results show that the proposed estimation system could accurately estimate the unbalance force and the feed-forward control system could restrain the unbalancing vibration to improving the rotational accuracy.