Objective To understand the situation of, mental health and behavior of the residents influenced by the environment noise. Methods From Feb. till Mar. 2005 and from Sep. till Oct. 2006, the residents living in 4 functional districts in Lu'an city, Anhui Province for one year or more were investigated by questionnaire. The investigation involved the general status, noise perception, behavior, adjustability and so on. 952 available questionnaires from 84 sites were attained. Results The significant differences were seen in the environmental noise perception among sex, age, occupation and health status (P