Silica aerogels exhibit remarkable sound absorption performance due to the unique properties and particular network structure,which make them good candidate materials for acoustics application.Apart from the inherent properties,the ambient conditions,such as humidity and temperature,also have a considerable influence on the sound absorption performance.Moisture in the atmosphere can be easily absorbed by the porous fibrous materials,causing a decrease in sound absorption coefficients over time.Herein,we investigate the acoustical performance of bridged silsesquioxane aerogels and study the influence of humidity for the hydrophobic modified and unmodified aerogels.Expectedly,this bridged silsesquioxane aerogels showed remarkable sound absorption performance.What is more,the comparison of hygroscopic properties and sound absorption performance between hydrophobic modified and unmodified aerogels under high humidity environments was studied in detail.It showed that the sound absorption coefficient decreased significantly for the hydrophobic unmodified aerogels due to the absorption of moisture,but changed little for the modified ones under high humidity environments.The results revealed the significant influence of humidity on the porous sound absorbing materials and also suggested the importance of hydrophobic modification of silica aerogels,providing us guidance for the preparation of silica aerogels for use as sound absorbing materials.