重症监护病房(ICU)肺感染是目前临床工作中重点和难点问题。临床医生在处理这一问题时经常面临如下尴尬:(1)病原学资料滞后、临床意义不确切或根本无法获得病原学资料。(2)抗生素选择以经验性治疗为主,治疗过度和治疗不足现象并存;经验性治疗失败后进一步诊断和治疗的思路或策? Intensive care unit (ICU) lung infection is the focus of clinical work and difficult issues. Clinicians often face the following embarrassment when dealing with this problem: (1) pathogenic data lag, clinical significance is not exact or can not get etiological data. (2) The selection of antibiotics is mainly based on empirical treatment, and the phenomenon of over-treatment and under-treatment co-exist. The further diagnosis and treatment of empiric treatment fails after the thought or policy.