Abstract：People only consider polarization characters of compressional and shear waves but neglect free interface effect in separating shear wave from compressional wave.It is positive that compressionat and shear waves are also incident upon free interface. Hence,both polarization character and free interface scattering are considered in separating off compressional wave and shear wave in this article. Theoretical computation formulae in this article not only reflect the dynamic polarization characters but also remove free interface effect. Good result has been seen in real data processing. The method is feasible.
