In this experiment, all kinds of natural fibers: coconut fiber, the lignin fibers mixed PVA and resin made of sound-absorbing boards for physical properties and acoustic test, go on the plate, to compare the proportion of differences relative now available in the sound-absorbing materialto produce a light weight, excellent physical properties, excellent sound-absorbing effect, long life and sound-absorbing plate.By the experiment that pure lignin fibers made of sheet metal of the highest sound absorption rate of 0.76, the highest sound absorption rate of 0.75 pure coconut fiber sheet, sound absorption sheet of pure coconut fiber and pure lignin fiber sheet are lignin fibercoconut fiber mixed plate, which 5 grams of lignin fiber, coconut fiber 45 g mixed plate high sound-absorbing rate is the highest, up to 0.81.