The human body continues to be exposed to noise in the environment, for a long time, there will be auditory caused by temporary hearing threshold shift, hearing becomes dull, but this situation does not last long, as long as the noise place to leave the quiet place to stay for a period of time, hearing will gradually return to its original state, this phenomenon is called temporary hearing threshold shift, also known as auditory fatigue. This phenomenon is called temporary hearing threshold shift, also called auditory fatigue. Auditory fatigue is due to the noise hazardous to human hearing, light high-frequency hearing threshold damage, deafness, and heavy tympanic membrane rupture. Generally manifested in the stimulation of sound and its frequency similar to the reduction of sound perception, but this reduction is generally temporary, in the stimulation of sound to stop the role of a short period of time after the auditory organ perception that is back to normal. The extent to which noise is harmful to human hearing is closely related to the form, intensity, frequency and duration of exposure.