I. History 1. Before doing other tests, the doctor will ask about the medical history in order to get a general understanding of the disease. The history generally includes: history of vertigo, ototoxic drug exposure, noise exposure, systemic acute and chronic infections, otology history, family history of hearing loss, hearing aid wearing history, hearing loss of children should also include the mother’s pregnancy history, birth history, pediatric growth history, speech development history, etc. In addition, the doctor will also ask about your speech and language ability (such as articulation clarity, comprehension, expression, etc.) and improve communication. In addition, the doctor will ask about your speech and language skills (such as articulation, comprehension, expression, etc.) and your desire to improve communication. Ear Examination Including the auricle, external auditory canal and tympanic membrane. Audiology and vestibular function examination 1. Pure tone audiometry: Including air conduction and bone conduction thresholds; pediatric behavioral audiometry can be used for children aged 6 years and below, including behavioral observation, visual reinforcement audiometry and game audiometry. Acoustic impedance: including tympanogram and stapedial reflex. Auditory evoked potentials: including ABR, 40 Hz auditory event-related potentials or auditory steady state response (ASSR), and cochlear microphonic potentials. 4. Otoacoustic emissions: aberration product otoacoustic emissions or transient evoked otoacoustic emissions. 5, speech audiometry: can be divided into speech recognition rate and speech recognition threshold test, according to the patient’s age and speech cognitive level to choose the appropriate open and/or closed speech test materials. 6. Hearing aid effect evaluation: hearing aid threshold test and/or speech recognition test after optimal fitting of hearing aids. 7. Vestibular function test (for those who have a history of vertigo and can cooperate with the test). 8.Drum cape electrical stimulation test (if necessary). Medical imaging 1.CT 2.MRI