The 4th Int'l Conference on Acoustics, Vibration and Noise Control (CAVNC 2021) will be held from October 29-31, 2021 in Guilin, China. This Conference will cover issues on Acoustics, Acoustical Engineering, Vibration and Noise Control, Noise Impacts, Noise Control Engineering, etc. It dedicates to creating a stage for exchanging the latest research results and sharing the advanced research methods. CAVNC 2021 will be an important and reliable platform for inspiring international and interdisciplinary exchange at the forefront of Acoustics, Vibration and Noise Control.