Auditory adaptation is the phenomenon of auditory perceptual changes caused by auditory stimuli acting on the auditory organs for a longer period of time. The exposure time under strong noise is short, and the hearing threshold is increased by more than 10 dB, which can be recovered by leaving the noise environment for a few minutes. What are the routine tests for pathological auditory adaptation? I. Speech test: Conducted in a quiet environment longer than 6m, with distance markers on the ground and the patient standing 6m from the examiner, but the body cannot be too close to the wall to avoid sound interference. The examined ear is facing the examiner, the other ear is blocked with oil cotton ball or finger and eyes are closed so as not to see the examiner’s mouth and lip movements affect the accuracy of the examination. The examiner uses the residual air in the airway to issue 1~2 syllables of words first, and the patient is instructed to repeat the heard words, attention should be paid to the power of each pronunciation should be consistent, the words are easy to understand, the high and low tones are used with each other, and the pronunciation is accurate and clear. Second, the table test: the patient sits, closes his eyes, plugs the non-examining side of the ear canal with his fingers, and the examiner stands behind the patient. After first familiarizing the patient with the sound of the examined table, the stopwatch is placed on the plane of the external auditory canal, and the distance from the ear at which he can just hear the sound of the table is repeatedly tested from far and near. The recording method is expressed in terms of the hearing distance (cm) of the examined ear/the standard hearing distance (cm) of the table, such as 100/100cm, 50/100cm. III. Whispering examination method: It is performed in a quiet room of 6m in length. The commonly used words are spoken with whispering intensity, and the distance that can be heard by the subject ear is recorded and compared with the normal ear (hearing distance of the subject ear/hearing distance of the normal ear). Tuning fork examination: The tuning fork is placed at about 1 cm from the ear canal opening and is heard as “air conduction”; placed on the skull and heard as “bone conduction”. This is the most common method to identify the nature of deafness. A set of five tuning forks with C-tone octave are commonly used, and their vibration frequencies are 128, 256, 512, 1024, and 2048 Hz. V. Pure tone hearing threshold test: including air conduction and bone conduction tests. The air conduction test starts from 1KHz, after the patient hears the sound, every 5dB a grade down, until it is not heard, and then increase the sound intensity grade by grade (5dB per grade), and so on repeatedly, until the exact hearing threshold is measured. Then test the hearing threshold of other frequencies in the same way in turn. Attention should be paid to the use of intermittent sounds during the examination to avoid auditory fatigue. The operation of the bone conduction test is the same as the air conduction test. Sixth, electrical response audiometry: the use of superimposed averaging technology to record the acoustic evoked potentials of the auditory system, determine the functional status of the auditory system, and analyze certain disorders of otology and neurology. Currently used in clinical practice are cochlear electrogram, auditory brainstem response and mid latency response. VII. Otoacoustic emission test: The clinical recommendation is to use transient acoustic evoked otoacoustic emission (TEOAE) and distortion product otoacoustic emission (DPOAE) in evoked OAE. Evoked otoacoustic emission can be applied for hearing screening of newborns, which is easy and fast. Those with positive OAE response can be judged as having normal peripheral hearing; combined with auditory evoked potential examination can identify cochlear and retrocochlear auditory system lesions. Eight, acoustic impedance audiometry: the basic test items are: static acoustic compliance measurement of the tympanic plane, tympanogram and stapedius muscle reflex test.