sweet potato vermicelli takes sweet potato starch as raw material and is made through multi-channel processing procedures including freeing. This nutrient-rich, low-fat and low-heat food can effectively prevent the carbohydrates from turning into fat and thus is conducive to weight loss and body-building. Sweet potato contains a lot of dietary fiber which can not be digested and absorbed in the intestine. In this way it can stimulate the intestinal tract, enhance peristalsis, and defaecation and detoxification. It is especially useful for the elderly constipation. Sweet potato is rich in carbohydrates, vitamins and other nutrients, in particular, lysine, β - carotene, vitamin E. In addition, sweet potato is a kind of alkaline food containing calcium, magnesium, potassium and other minerals. Calcium and magnesium can prevent osteoporosis; Potassium is effective in preventing high blood pressure. Sweet potato can neutralize with meat, eggs and other acidic foods to regulate the body's acid-base balance. Test data shows that sweet potato contains rich antioxidants which can effectively eliminate free radicals and inhibit cancer cells.