Dietary surveys were made of the inhabitants living in Loo-Ho Hsien, SiKong Tibetan Self-governing District. The inhabitants were classified into peasants and herdsmen according to their occupations. The diet of the peasants consisted mainly of tsing-ko(one variety of barley), pea and potato, and occasionlly other tubers, vegetables, beef and butter. The herdsmen consumed mainly beef, mutton, tsing-ko, butter and milk etc. Tea is a necessity in Tibetan life.The diets of 110 peasants and 76 herdsmen were recorded by inquiry method, and the nutrients were calculated. It was found that vitamin A was generally insufficient(low vitamin A content in butter), the calorie value was low in the poor families and the vitamin C intake was deficient in herdsmen. Since the food habits were different between the two groups, the quantities of nutrients they obtained were not alike. The herdsmen took more protein, fat and vitamin A, but less thiamine, niacin and vitamin C.The representative foodstuffs were analysed for their nutrient contents, and food habits of the Tibetans and methods of preparing food were described.