The NQR responses of the nuclear spin system with I=1 to frequency offsets and pulse widths are examined with fictitious 1/2-spin operator formalism. The transverse magnetization and longitudinal magnetization are observed with one pulse and two pulses sequence, respectively. The experimental results measured with NQR probe are consistant with theoretical calculations. It is shown that the NMR vector model can be applied to the NQR system for I=1 when the rf excitation is intro-duced on one axis in EFG principal axis frame.