目的　探讨及时、准确地临床诊断严重急性呼吸综合征 (SARS)的可靠依据。方法　对同时具备发热、血象不高、胸部X线有异常改变的 179例患者按照我们总结的SARS胸部X线特征性表现进行了临床分析。结果　符合文中 4项胸部X线特征性表现中的 3项 (含 )以上者 ,均临床诊断为SARS ,非SARS患者只符合 4项中的两项 (含 )以下。结论　胸部X线片的特征性表现对SARS诊断和鉴别诊断具有重要价值 Objective To explore a reliable basis for timely and accurate clinical diagnosis of severe acute respiratory syndrome (SARS). Methods A total of 179 patients with fever, low blood count and abnormal chest X-ray were analyzed according to the chest X-ray findings of SARS. The results were consistent with four of the four characteristic chest X-ray findings of three or more were clinically diagnosed as SARS, non-SARS patients only meet the two of the four (inclusive) or less. Conclusion The characteristic manifestations of chest radiographs are of great value in the diagnosis and differential diagnosis of SARS