We propose an alteative scheme for preparing N-qubit cluster state by using a frequency-modulated laser field to simultaneously illuminate the trapped ions. Selecting the index of modulation yields the selective mechanisms of coupling and decoupling between the inteal and exteal states of the ions. Based on the selective mechanisms,the highly entangled duster state is achieved. In our scheme, the vibration mode is only virtually excited.Thus the quantum operations are insensitive to the heating and lead to the high-fidelity quantum information processing.