人耳能听到20～20000Hz不同频率的声音,但目前临床常用的听力评价方法为纯音测听,其范围只包括0.125～8kHz。而扩展高频测听为非常规纯音测听,可以测得人耳8kHz以上的扩展高频听阈。近年来,有研究认为内耳的早期损伤首先发生在10～20kHz,而10kHz以上频率出现异常早于其他频率〔 People can hear the sound of 20 ~ 20000Hz different frequencies, but currently used in clinical hearing evaluation method for pure tone audiometry, the scope of which only includes 0.125 ~ 8kHz. The expansion of high-frequency audiometry for non-conventional pure tone audiometry, you can measure the human ear more than 8kHz extended high-frequency hearing threshold. In recent years, some studies suggest that the early damage of the inner ear first occurs at 10 ~ 20kHz, while the frequency above 10kHz occurs earlier than other frequencies [