Article Yanchi the mountains in the south there is a salt wind tunnel, "Weather has a mid-summer, ran the rumbling sound, commonly known as salt southerlyyan hua was this salt overnight." Southerly salt also known as "South Wind" and "Kingdom of salt" and "midwives." For thousands of years, the people working here at the practice of long-term summing up the production of the "five-step method" salt production process, all over the world are also the first Chinese salt production process, the British scientist Joseph Needham called the "Chinese history of ancient living fossil Technology . " Later, it also created a "cultivated plot (qi, two sound) water drying method", greatly improving the yield and the stability of salt. Produced because of Yuncheng Yanchi "salt Hedong" high yield, good quality and marketing in foreign countries and even across many places, was one of Liu Zongyuantang song ba da jia as "Shinzo great treasure." Salt is a special kind of merchandise, all of its historical past as the country's important financial and economic pillars. During the Tang dynasty, Yuncheng salt Yanchi income benefit income accounted for one-eighth of the national treasury; the Song Dynasty, they are accounted for one-sixth of the national treasury income. Based on the importance of salt in the feudal society, the management of the Salt and Sydney are some of the imperial court. When the Northern Song Dynasty, Bao Zhenglian li Division Three households had the capacity of the Ministry offu shi as "xun yan yu shi " Hedong Salt chair for up to five years; the Qing Dynasty, Chuan-Shannian geng yao also act as Governor "xun yan Royal the "period of three years.

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