The results showed that the noise from all of three type tested materials for pelleted pump in a control room were reduced. While the averaged NR of type Ι, type Π, and type Ш with the distance of 20 centemeter from wall room of 20 centemeter were 5.7±0.33 dB, 7.1±0.24 dB, and 3.8±0.26 dB respectively; the averaged TL were 19.9±0.14 dB, 20.5±0.28 dB, and 16.7±0.14 dB respectively. The comparison between three type at before and after installation was significantly different by NR at p = 0.003, p = 0.002, and p = 0.001 respectively. The measurement showed that the silmulation the pelleting the control room with the material type Π was more effectively than others.