Tofu (bean curd, one major product made from the soybean) first emerged in the Ran Dynasty (206B. C. -220A. D. ). Its complete process was unearthed in a tomb of the Eastern Ran Dynasty (25-220A. D. ) in Mi county of Renan province in 1959. The traditional technology in production of bean curd is not only simple and convenient but also practical, which is a great beginning of the people in ancient China. From the Song Dynasty to the Ming and Qing Dynasties, various soy protein products such as Furu (fermented tofu, appeared in the Ming Dynasty), Fuzhu and Doufugan (dehydrated Doufu) appeared successively. At the same time, the cookery of tofu developed quickly and the rich culture of bean curd produced. The art of tofu was spread abroad gradually by the nongovernmental contact.