Objective To investigate clinical characteristics about patients of community acquired pneumonia complicated with type two diabetes and the methods of diagnosis and therapy, in order to improve recovery rate.Methods To analyze clinical data methods of diagnosis and therapy and therapeutic effect of forty five patients who were diagnozed community acquired pneumonia complicated with type two diabetes. Results The clinical characteristics of patients of community acquired pneumonia complicated with type two diabetes are delitescence of symptom,metabolic disturbance,severe pathogenetic condition,difficult control of infection and high fatality rate cetera,after afford homologue treatments including regimenting blood glucose, selecting sensitive antibiotics to control infection, ameliorating pulmonary function and nutritional support and so on, thirty eight patients were cured, two patients were given up because of severe pathogenetic conditions,five patients died because of multiple organ failure,recovery rate was 84. 44%. Conclusion Compared to patients of purecommunity acquired pneumonia, the patients of community acquired pneumonia complicated with type two diabetes had unique clinical characteristics, and need to give special treatment