Abstract: In this paper, a study of the calculation on the acoustic radiation porblem caused by vibrating body is presented, based on the boundary element method using cubic B-spline interpolating function. Taking a pulsating sphere as an example, some parameters in its sound field are calculated. The conclusion from the comparison between the calculating results and the analytic solutions shows that the calculating precision is satisfied in a wide rang of vibrating frequences by the method proposed here for the acoustic radiation problem caused by vibrating body, in spite of the coarse division of the boundary surface.