A higher proportion of malnutrition is found in the elderly with diabetes, especially in those hospitalized ones, but this phenomenon is easier to be ignored. For the elderly patients with diabetes mellitus, their special physiological status, social factors, comorbidities and taking oral hypoglycemic drugs, all increase the risk for malnutrition. Consequently, it can make patients extend the length of hospital stays, increase the risk for life-threatening complications, and then arise the mortality. So, clinicians should enhance the screening of nutritional status and emphasize the nutritional support in aged diabetes patients. What’s more, they also need to reduce the use of some oral hypoglycemic drugs, advocate the application of insulin therapy and set individualized treatment plan, so as to improve the quality of life in elderly diabetic population.