Polyester fiber is hot pressed by high technology and made in the shape of cocoon surface, realizing density diversity to ensure ventilation, becoming an excellent product in sound absorption and heat insulation materials. The highest sound absorption coefficient in the noise range of 125~4000HZ reaches more than 0.8. According to different needs, the reverberation time can be shortened to remove sound impurities, improve the sound effect, and improve the clarity of voice. The product has the characteristics of sound absorption, environmental protection, anti-bacteria, flame retardant, light weight, easy processing, stability, impact resistance, simple maintenance, etc.