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We propose to enhance the generation of a phonon laser by exploiting optical superradiance.In our scheme,the optomechanical cavity contains a movable membrane,which supports a mechanical mode,and the superradiance cavity can generate the coherent collective light emissions by applying a transverse pump to an ultracold intracavity atomic gas.The superradiant emission tus out to be capable of enhancing the phonon laser performance.This indicates a new way to operate a phonon laser with the assistance of coherent atomic gases trapped in a cavity or lattice potentials.