采用３０例呼吸衰竭动脉血气分析的四项氧合指标建立ｂａｙｅｒ判别函数，将呼吸衰竭分为氧合衰竭（Ⅰ型）、通气衰竭（Ⅱ型）和混和性呼衰（Ⅲ型），对８０例呼衰进行回归检验，总判对效率为９２．５％，其中Ⅰ型判对率为９３％，Ⅱ型判对率为８７％，Ⅲ型判对率为１００％，认为氧合指标是判断呼吸衰竭的可靠根据，以四项氧合指标为基础，将呼衰分为上述三型有利于临床对病情的判断和指导治疗。 Bayer discriminant function was established by using four oxygenation indexes of arterial blood gas analysis of respiratory failure in 30 cases. The respiratory failure was divided into oxygenation failure (type Ⅰ), ventilatory failure (Ⅱ) and mixed respiratory failure (Ⅲ) Cases of respiratory failure regression test, the total sentenced pair efficiency of 92.5%, of which type Ⅰ sentence was 93%, type Ⅱ sentenced to 87%, type Ⅲ sentenced to 100%, that the oxygenation index is To determine the reliable basis for respiratory failure, based on the four oxygenation indicators will be divided into three types of respiratory failure is conducive to the clinical judgment of the disease and guide the treatment.