Abstract: This paper investigates the influence of scatterer’s tropism on band gaps of 3D phononic crystal.By using the plane wave expansion method,the authors calculated the band structure of 3D phononic crystals with the three structures.The results show that the band gaps can be adjusted by changing the scatterer’s tropism.For Simple-Cubic (SC) and  Face-Centered-Cubic (FCC) structure the lowest band gap width becomes narrower,while for Body-Centered-Cubic (BCC) structure the lowest band gap width becomes wider as the rotation angle of the scatters increases.

Key words: phononic crystal, band gap, plane wave expansion method, rotation angle