A focusing controller and a method thereof for an optical disk drive. The focusing controller includes a filter which filters out a high-frequency component of the track error signal to output an adjusted signal, a coupler which couples the focus error signal with the adjustment signal to generate a coupled signal. The focusing controller further includes a focus compensator which receives the coupled signal and output the focus control signal to control position of the pick up head of the optical disk drive out of focus such that the coupling of the track error signal with the focus error signal is improved and also the stability of the servo system. While seeking ended, the offset signal is removed to resume the position of the optical pick-up head to the normally focus position.