一氧化氮（ＮＯ）是由机体通过一氧化氮合酶（ＮＯＳ）合成作用于多种组织器官的活性氮介质。本文对小儿肺炎血清ＮＯ和ＮＯＳ的检测，探讨其在肺炎患儿中的变化和意义。对象与方法一、对象　肺炎患者６０例。男２８例，女３２例。平均４ａ２ｍｏ，符合肺炎诊断标准［１］。系 Nitric oxide (NO) is an active nitrogen mediator that is synthesized by the body through a combination of nitric oxide synthase (NOS) and various tissues and organs. In this paper, detection of pediatric pneumonia serum NO and NOS, to explore its changes and significance in children with pneumonia. Objects and methods First, the object 60 patients with pneumonia. 28 males and 32 females. Average 4a2mo, in line with the diagnostic criteria for pneumonia [1]. system