１５７例慢性阻塞性肺病（ＣＯＰＤ）患者、５５例正常人的最大吸气口腔压（Ｐｉ＿（ｍａｘ））、平静吸气口腔压（Ｐｉ）以及吸气肌储备功能指标（Ｐｉ／Ｐｉ＿（ｍａｘ））与５项反映气道阻塞的常规肺功能指标的测定结果显示：除轻度ＣＯＰＤ与中度ＣＯＰＤ相比Ｐｉ＿（ｍａｘ）、Ｐｉ／Ｐｉ＿（ｍａｘ）无明显差异外，ＣＯＰＤ各组均随病情严重程度的加重，而致Ｐｉ＿（ｍａｘ）进行性降低，Ｐｉ／Ｐｉ＿（ｍａｘ）增大，表明气道阻塞加重可降低吸气肌力和吸气肌储备功能。Ｐｉ／Ｐｉ＿（ｍａｘ）用于吸气肌功能不全的早期诊断具有一定的临床应用价值。 The maximal inspiratory pressure (Pi_ (max)), inspiratory pressure (Pi) and inspiratory muscle reserve index (Pi / Pi_ (max)) in 157 patients with chronic obstructive pulmonary disease (COPD) ) And five routine pulmonary function indicators that reflect airway obstruction showed that there was no significant difference in Pi max and Pi / Pi max between mild COPD and moderate COPD, The aggravation of severity led to the decrease of Pi max and the increase of Pi / Pi max, which suggested that the obstruction of inspiratory tract could reduce inspiratory muscle and inspiratory muscle reserve function. Pi / Pi max for the early diagnosis of aspiratory muscle dysfunction has some clinical value.