肺功能测定是表达呼吸生理的方法。肺内气体容积不但在一个呼吸周期内有规律的变化,而且呼吸深度不同,肺内容积也随之而变,单位时间内出入肺的气量,可以反映肺通气功能。近年来,随着科学技术的发展,肺功能测验范围不断扩大,除应用临床外,在劳动卫生、环境卫生、体育、教育、高空航行,高原生理研究,深水作业,国防建设等领域也受到重视。海南地处热带和亚热带,过去没有人进行这方面的普查,没有这方面的预计正常值,因此,对年青人的肺 Pulmonary function tests are methods of expressing respiratory physiology. The volume of the lungs not only changes regularly within one respiratory cycle but also varies with the depth of the lungs. The volume of the lungs also changes. The volume of air exiting the lungs per unit time can reflect the function of the lungs. In recent years, with the development of science and technology, the range of lung function tests has been expanding. In addition to clinical application, attention has also been paid to fields such as labor and health, environmental hygiene, sports, education, high altitude navigation, plateau physiology, deepwater operations and national defense construction . Hainan is located in the tropics and the subtropics. In the past, no one conducted any census in this respect and there is no expected normal value in this respect. Therefore,