Abstract: The denoising effect of the sound barriers made from closed-cell aluminum foam was investigated taking some sections of the sound barriers located nearby the Zhulin Overcross of the East-West expressway in Shenyang City as examples, where the sound pressure level of noise was measured with spectrum analysis before and after setting the sound barriers there. The denoising effect of closed-cell aluminum foam was evaluated via the insertion loss calculated for such sound barriers. A comparative denoising analysis of sound barrier was made between the closed-cell aluminum foam and conventional window shutters, and the results showed that the denoising effect of the former is superior to that of the latter, especially in the highly-noisy frequency band from 20 to 630?Hz beside the expressway.