Porous materials are usually used for acoustic absorption applications.Different kinds of pore size and pore shapes were prepared by 3D printing. And the sound absorption properties of them are evaluated by both the numerical calculation using the Comsol Multiphysics software and the experimental measurement as well. It is found that the sound absorption coefficient increases with increasing the title angle of the conical holes

then reaches the maximum value when the pore angle is 45°. A further increase in the title angle of the conical holes lowers the sound absorption coefficient.  Meanwhile

the sound absorption coefficient increases gradually with increasing the pore depth from 2mm to 5mm. However

when the depth of the pores increases from 5mm to 7mm

the sound absorption coefficient doesn't have obvious change anymore.