ObjectiveTo analyze clinical characteristics of communityacquired pneumonia (CAP)in diabetic and nondiabetic patients.MethodsFrom January 2008 to May 2011,100 CAP patients in a hospital were selected, 50 of whom had diabetes (group A) and 50 without diabetes (group B), their clinical data were analyzed.ResultsThe average length of hospital stay in group A was significantly longer than that of group B (［18.52±4.32］ d vs ［12.64±4.18］ d, χ2=6.92，P＜0.01); serum alanine aminotransferase (ALT) and aspartate transaminase (AST)in group A were significantly higher than group B (［52.26±15.18］ U/L vs ［40.39±15.42］ U/L; ［48.44 ±10.25］ U/L vs ［35.70±9.98］ U/L, P<0.05, respectively); blood urea nitrogen (BUN) and serum creatinine (SCr) in group A were significantly higher than group B (［8.02±2.12］ mmol/L vs ［5.35±1.99］ mmol/L; ［128.05±21.25］ μmol/L vs ［98.20±20.93) μmol/L, P <0.05, respectively). Mixed infection rate in group A was significantly higher than group B (26.00% vs 10.00%); metabolic syndrome and incidence of macrovascular complications were significantly higher than group B (28.00% vs 12.00%; 36.00% vs 10.00%, P<0.05, respectively). Rate of severe pneumonia and mortality in group A was 12.00% (6 cases) and 6.00% (3 cases) respectively,and group B was 4.00% (2 cases) and 2.00% (1 case) respectively, sputum culture positive rate in group A and B was 82.00% (41/50) and 88.00% (44/50) respectively, Streptococcus pneumoniae (16 isolates in group A and 17 in group B) and Klebsiella pneumoniae (4 isolates in group A and 5 in group B)were common in both groups.ConclusionDiabetic patients with CAP have long disease course, with severe illness and multiple complications, controlling blood glucose is the basis of treatment, antiinfection is the key, and improving nutritional state and organ function is important aspect.