Abstract: BEM-based scattering sound near field acoustic holography technique which can be used to reconstruct scattering field on the surface of a target and to predict the whole scattering field from measured near scattering field is described.First,the fundamental equations of this method and the related separation method for scattering field are brought forward.Then the problems such as the affect of different hologram to reconstructed result,the availability of singular value filter method and the applicability of scattering field separation method are analyzed by means of numerical simulation.