Abstract: A sound absorption performance calculation method of viscoelastic materials based on virtual.lab is introduced in the article.Dynamic mechanical performances in low frequencies and different temperatures are measured by Dynamic Mechanical Analysis(DMA),wide frequency mechanical performances are obtained by WLF principle and sound parameters are calculated by dynamic mechanical parameters.Inputling the sound parameters to virtual.lab software,the material's sound absorption performance can be calculated by virtual.lab.Two rubber materials' sound absorption performances are calculated by the method.The calculated results are compared to the measure results.The two results are quite consistent.