Abstract:To analyze the prevalence of metabolic syndrome (MS) among patients with diabetes mellitus. Methods Totally 283 patients with diabetes mellitus in our hospital between January 2012 and February 2015 were enrolled in the study and divided into MS group and control group according to defined diagnostic criteria on MS from the 2010 hypertension guidelines. Prevalence of MS in the patients with different gender or age were compared. Multivariate logistic regression analysis was performed to investigate the related factors of MS. Results Of the 283 patients, 190 cases (67.1%) had MS, and the prevalence of MS in the female patients was 75.6%, which was significantly higher than that (63.2%) of the male patients (p < 0.05). The morbidity of MS in the young, middleaged and elderly patients was 51.4%, 67.0% and 77.1% respectively; and the morbidity of MS in the corresponding age group of the female patients was 41.7%, 75.9% and 95.0% respectively, there were significant differences among all age groups ( p< 0.05). The older the male and female patients, the higher the incidence of elevated BP (p <0.05). Educational level and smoking were the independent factors affecting the prevalence of MS in the young patients with diabetes mellitus ( p< 0.05); gender was the independent factor in the middle-aged patients ( p< 0.05);and gender and lifestyle were the independent factors in the elderly patients ( p< 0.05). Conclusions More than twothirds of patients with diabetes suffer from MS. The incidence of MS in female patients is higher than that in male patients. And the incidences of MS and elevated BP tend to increase with age. Smoking could significantly increase the risk of MS in young patients with diabetes while physical exercise could reduce the risk in elderly patients.