Abstract: White noise was generated by Adobe Audition on the computer, and a simple spectrograph was simulated by programming with Matlab, and a computer based testing device for noise insulation and absorption characteristics of materials was made. On this basis, the transmission and reflection noise reduction characteristics of nine common home decoration materials, such as wood board, cement board, glass, metal plate and foam board, as well as the influence of the thickness of samples and the incidence angle of sonic wave on noise reduction performance, were studied experimentally. The experiment shows that the test device can characterize the noise reduction characteristics of materials with low cost and high flexibility, which make up for the deficiency of the existing materials noise reduction characteristic testing device.