A method of controlling an airbag inflator, may include determining, when an occupant is accommodated on a seat, whether the weight of the occupant is in which of first to fourth weight ranges sequentially allocated by a controller, performing a first logic for operating an inflator at the lowest one of three intensities by the controller when it is determined that the weight of the occupant is in the lightest first weight range, and performing a second logic for operating the inflator at the intermediate intensity or a third logic for operating the inflator at the highest intensity by the controller, according to conditions such as a position of a seat, a state of operation of a recliner, a collision condition, a collision pulse, and wearing of a belt, when it is determined that the weight of the occupant is in the third or fourth weight range.
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