近年来，卒中相关性肺炎(SAP)呈现发病率高、上升快的趋势。SAP延长患者住院时间，同时也增加卒中后的死亡率，SAP的有效预防成为新的关注点。目前SAP的发病机制尚未明确，免疫抑制、误吸、吞咽障碍、糖尿病、心房颤动及是否机械通气等都是SAP的危险因素。免疫抑制是其中重要的危险因素，现代研究证实，卒中后急性期内，机体确实发生一系列的免疫抑制状态改变，患者易感性增加。中医学认为脑卒中的发生以"正虚"为因，卒中后仍是"气虚"不能"卫外"，邪袭肺腑，发为SAP。玉屏风散作为扶正固表的代表方剂，现代药理学表明，其具有增强免疫，恢复免疫器官功能的作用。从多角度探讨应用玉屏风散预防SAP的合理性。

Recently, the incidence of stroke-associated pneumonia(SAP) is high and rising rapidly. SAP extends the length of patients stay and increases the death rate, so effective prevention of SAP becomes a new focus. The pathogenesis of SAP is not yet clear, andrelated risk factors include immunosuppression, aspiration, dysphagia, diabetes, atrial fibrillation, mechanical ventilation, etc., among which immunosuppression is an important one. Modern medical research has confirmed that in the acute phase after stroke, patients have increasing susceptibility to infection, when a series of immunosuppressive changes have taken place in the body, Traditional Chinese medicine believes that the cause of stroke is " vital qi deficiency" , soafter stroke, with qi deficiency, the body cannot resist external pathogens. As a result, pathogenic factors assailing the lungs easily cause stroke-associated pneumonia. Yupingfeng powders, as a representative prescription for strengthening vital qi and consolidating superficies, has been proved that it can enhance immunity and restore the function of immune organs. This paper discussed the rationality of the application of Yupingfeng powders in the prevention of SAP.