Objective To study the common syndromes of community acquired pneumonia（CAP） and analyze the characteristics of elderly patients.Methods The data of CAP patients of 4 hospitals were collected.The database was set up with Epidata software.SPSS13.0 was applied to analyze the regulation of common syndrome.Results Of the data of 1 059 patients

there were 23 TCM syndromes

and the phlegm heat retention in the lung was the one appeared in highest frequency.Compared with non-aged pneumonia patients

the syndromes of lung qi deficiency

phlegm damp retention in the lung

phlegm and blood stasis in the lung

spleen qi deficiency

both qi and yin deficiency

lung and spleen qi deficiency

kidney qi deficiency

lung and kidney qi deficiency

lung yin deficiency

kidney yin deficiency

lung and kidney yin deficiency were in high frequency in aged patients（P<0.05）.The common syndromes of pneumonia were wind heat attacking the lung

outside cold but inside heat

phlegm heat retention in the lung

phlegm damp retention in the lung

lung and spleen qi deficiency

and both qi and yin deficiency.Conclusion There were 6 common syndromes of CAP

and the phlegm heat retention in the lung is the most common one.Pneumonia of aged patients is usually with qi deficiency or both qi and yin deficiency.