The simulation model related to calculate the acoustic radiation force on a rigid cylindrical particle in water under the modulated Gaussian beam is established using the two-dimensional finite difference time domain method(FDTD). The effects of the impedance boundary on the acoustic radiation force of rigid cylindrical particle are analyzed. The simulation results show that the amplitude of the acoustic radiation force function has significant change at low frequencies, while it tends to be stable at the high frequencies. The transverse acoustic radiation force increases with the acoustic reflection coefficient and the axial acoustic radiation force decreases as it. But the value of acoustic radiation force for different impedance boundary varies between the value of the rigid cylindrical particle near a soft boundary and an absolutely rigid wall. When the particle lies near the impedance boundary, the acoustic radiation force function varied notably. When the particle far away the boundary, the acoustic radiation force function tends to be stable. Although different reflection coefficients have different effects on acoustic radiation, but the trend is same.

FDTD; rigid cylindrical particle; Gaussian beam; acoustic radiation force; impedance boundary