Butter is a sweet-smell dairy product derived from yak milk and sheep milk. Yak butter is the favorite of Tibetan people which is produced with bright yellow color in summer and autumn and light yellow in winter. Sheep butter is white and glossy, inferior to yak butter in the nutritional value and taste. The butter can moisten your stomach and intestines with various vitamins and high nutritional value. In Tibetan areas where the food structure is relatively simple, it can supplement the various needs of human body.