In order to response the increasing of aging population cause losing ability that need long-care needs, the project entitled "10-year long-term care program" from Executive Yuan in 2007 is carried out to assist economically disadvantaged and disabled elderly to acquire daily nutrition. Therefore, the long-term care resident's nutritional status got more attention than before. Out of control in blood glucose will not only increase bed sores and urinary tract infection in tube feeding residents but also rise medical expenditures. The nutritional status of long-term care institutions, anyang homes and nursing home are generally bad in nutrition management due to high cost of nutritional supplements from foreign imports that cause the burden of families. In this study, we will recruit diabetic subjects that divide into white sweet potato group (experimental group) and commercial formula group (control group) by using randomized, parallel and open clinical study through tube feeding in sixty days.