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We achieve the resonant actuation of a microcantilever by using a pulse wave of one-nth the microcantilever resonant frequency. Our studies on the relationship between pulse duration and microcantilever resonant amplitude reveal that the most effective actuation can be acquired when the pulse duration is odd multiples of the half period of microcantilever resonant oscillation. This actuation method is generally applicable and may find applications in ultrahigh frequency actuation of microcantilever or similar resonant systems for high sensitivity detection.