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We present an alteative scheme for implementing the unconventional geometric two-qubit phase gate and prepar-ing multiqubit entanglement by using a frequency-modulated laser field to simultaneously illuminate all ions. Selecting the index of modulation yields selective mechanisms for coupling and decoupling between the inteal and the exteal states of the ions. By the selective mechanisms, we obtain the unconventional geometric two-qubit phase gate, multipar-ticle Greenberger-Hoe-Zeilinger states and highly entangled cluster states. Our scheme is insensitive to the thermal motion of the ions.